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Articles 6091 - 6120 of 9543

Full-Text Articles in Physical Sciences and Mathematics

Discovery Of A Luminous Blue Variable With An Ejection Nebula Near The Quintuplet Cluster, Jc Mauerhan, Mr Morris, A Cotera, H Dong, Qd Wang, Sr Stolovy, C Lang, Is Glass Jan 2010

Discovery Of A Luminous Blue Variable With An Ejection Nebula Near The Quintuplet Cluster, Jc Mauerhan, Mr Morris, A Cotera, H Dong, Qd Wang, Sr Stolovy, C Lang, Is Glass

Astronomy Department Faculty Publication Series

We report on the discovery of a luminous blue variable (LBV) lying 7 pc in projection from the Quintuplet cluster. This source, which we call LBV G0.120 – 0.048, was selected for spectroscopy owing to its detection as a strong source of Paschen-α (Pα) excess in a recent narrowband imaging survey of the Galactic center region with the Hubble Space Telescope/Near-Infrared Camera and Multi-Object Spectrometer. The K-band spectrum is similar to that of the Pistol Star and other known LBVs. The new LBV was previously cataloged as a photometric variable star, exhibiting brightness fluctuations of up to 1 …

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Variable O Vi And N V Emission From The X-Ray Binary Lmc X-3: Heating Of The Black Hole Companion*, L Song, Tm Tripp, Qd Wang, Y Yao, W Cui, Y Xue, Ja Orosz, D Steeghs, Jf Steiner, Map Torres, Je Mcclintock Jan 2010

Variable O Vi And N V Emission From The X-Ray Binary Lmc X-3: Heating Of The Black Hole Companion*, L Song, Tm Tripp, Qd Wang, Y Yao, W Cui, Y Xue, Ja Orosz, D Steeghs, Jf Steiner, Map Torres, Je Mcclintock

Astronomy Department Faculty Publication Series

Based on high-resolution ultraviolet spectroscopy obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) and the Cosmic Origins Spectrograph, we present new detections of O VI and N V emission from the black hole X-ray binary (XRB) system LMC X-3. We also update the ephemeris of the XRB using recent radial velocity measurements obtained with the echelle spectrograph on the Magellan-Clay telescope. We observe significant velocity variability of the UV emission, and we find that the O VI and N V emission velocities follow the optical velocity curve of the XRB. Moreover, the O VI and N V intensities regularly decrease …

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The Radio Properties And Magnetic Field Configuration In The Crab-Like Pulsar Wind Nebula G54.1+0.3, Cc Lang, Qd Wang, F Lu, Ki Clubb Jan 2010

The Radio Properties And Magnetic Field Configuration In The Crab-Like Pulsar Wind Nebula G54.1+0.3, Cc Lang, Qd Wang, F Lu, Ki Clubb

Astronomy Department Faculty Publication Series

We present a multifrequency radio investigation of the Crab-like pulsar wind nebula (PWN) G54.1+0.3 using the Very Large Array. The high resolution of the observations reveals that G54.1+0.3 has a complex radio structure which includes filamentary and loop-like structures that are magnetized, a diffuse extent similar to the associated diffuse X-ray emission. But the radio and X-ray structures in the central region differ strikingly, indicating that they trace very different forms of particle injection from the pulsar and/or particle acceleration in the nebula. No spectral index gradient is detected in the radio emission across the PWN, whereas the X-ray emission …

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X-Raying Galaxies: A Chandra Legacy, Qd Wang Jan 2010

X-Raying Galaxies: A Chandra Legacy, Qd Wang

Astronomy Department Faculty Publication Series

This presentation reviews Chandra’s major contribution to the understanding of nearby galaxies. After a brief summary on significant advances in characterizing various types of discrete x-ray sources, the presentation focuses on the global hot gas in and around galaxies, especially normal ones like our own. The hot gas is a product of stellar and active galactic nuclear feedback—the least understood part in theories of galaxy formation and evolution. Chandra observations have led to the first characterization of the spatial, thermal, chemical, and kinetic properties of the gas in our galaxy. The gas is concentrated around the galactic bulge and disk …

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Extinction Toward The Compact Hii Regions G-0.02-0.07, Ea Mills, Mr Morris, Cc Lang, A Cotera, H Dong, Qd Wang, Sr Stolovy Jan 2010

Extinction Toward The Compact Hii Regions G-0.02-0.07, Ea Mills, Mr Morris, Cc Lang, A Cotera, H Dong, Qd Wang, Sr Stolovy

Astronomy Department Faculty Publication Series

The four HII regions in the Sgr A East complex: A, B, C, and D, represent evidence of recent massive star formation in the central ten parsecs. Using Paschen-alpha images taken with HST and 8.4 GHz VLA data, we construct an extinction map of A-D, and briefly discuss their morphology and location.

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X-Ray Spectroscopy Of Galactic Hot Gas Along The Pks 2155$-$304 Sight Line, T Hagihara, Y Yao, Ny Yamasaki, K Mitsuda, Qd Wang, Y Takei, T Yoshino, D Mccammon Jan 2010

X-Ray Spectroscopy Of Galactic Hot Gas Along The Pks 2155$-$304 Sight Line, T Hagihara, Y Yao, Ny Yamasaki, K Mitsuda, Qd Wang, Y Takei, T Yoshino, D Mccammon

Astronomy Department Faculty Publication Series

We present a detailed spectroscopic study of the hot gas in the Galactic halo toward the direction of a blazer PKS 2155304 ( 0.117). The OVII and OVIII absorption lines were measured with the Low and High Energy Transmission Grating Spectrographs aboard Chandra, and the OVII, OVIII, and NeIX emission lines produced in an adjacent field of the PKS 2155304 direction were observed with the X-ray Imaging Spectrometer aboard Suzaku. Assuming vertically exponential distributions of the gas temperature and the density, we performed a combined analysis of the absorption and emission data. The gas temperature and the density at the …

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The Physical Scale Of The Far-Infrared Emission In The Most Luminous Submillimetre Galaxies – Ii. Evidence For Merger-Driven Star Formation, Jd Younger, Gg Fazio, Mln Ashby, F Civano, Ma Gurwell, J-S Huang, D Iono, Ab Peck, Gr Petitpas, Ks Scott, Dj Wilner, Gw Wilson, Min Yun Jan 2010

The Physical Scale Of The Far-Infrared Emission In The Most Luminous Submillimetre Galaxies – Ii. Evidence For Merger-Driven Star Formation, Jd Younger, Gg Fazio, Mln Ashby, F Civano, Ma Gurwell, J-S Huang, D Iono, Ab Peck, Gr Petitpas, Ks Scott, Dj Wilner, Gw Wilson, Min Yun

Astronomy Department Faculty Publication Series

We present high-resolution 345-GHz interferometric observations of two extremely luminous (Lir≳ 1013 L⊙), submillimetre-selected galaxies (SMGs) in the Cosmic Evolution Survey (COSMOS) field with the Submillimeter Array (SMA). Both targets were previously detected as unresolved point sources by the SMA in its compact configuration, also at 345 GHz. These new data, which provide a factor of ≳3 improvement in resolution, allow us to measure the physical scale of the far-infrared in the submillimetre directly. The visibility functions of both targets show significant evidence for structure on ∼0.5–1-arcsec scales, which at z≳ 1.5 translates …

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The Far-Infrared/Submillimeter Properties Of Galaxies Located Behind The Bullet Cluster, M Rex, Min Yun, Et. Al. Jan 2010

The Far-Infrared/Submillimeter Properties Of Galaxies Located Behind The Bullet Cluster, M Rex, Min Yun, Et. Al.

Astronomy Department Faculty Publication Series

The Herschel Lensing Survey (HLS) takes advantage of gravitational lensing by massive galaxy clusters to sample a population of high-redshift galaxies which are too faint to be detected above the confusion limit of current far-infrared/submillimeter telescopes. Measurements from 100–500 μm bracket the peaks of the far-infrared spectral energy distributions of these galaxies, characterizing their infrared luminosities and star formation rates. We introduce initial results from our science demonstration phase observations, directed toward the Bullet cluster (1E0657-56). By combining our observations with LABOCA 870 μm and AzTEC 1.1 mm data we fully constrain the spectral energy distributions of 19 …

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New Panoramic View Of $^{12}$Co And 1.1 Mm Continuum Emission In The Orion A Giant Molecular Cloud. I. Survey Overview And Possible External Triggers Of Star Formation, Y Shimajiri, R Kawabe, S Takakuwa, M Saito, T Tsukagoshi, M Momose, N Ikeda, E Akiyama, Je Austermann, H Ezawa, K Fukue, M Hiramatsu, D Hughes, Y Kitamura, K Kohno, Y Kurono, Ks Scott, Gw Wilson, A Yoshida, Min Yun Jan 2010

New Panoramic View Of $^{12}$Co And 1.1 Mm Continuum Emission In The Orion A Giant Molecular Cloud. I. Survey Overview And Possible External Triggers Of Star Formation, Y Shimajiri, R Kawabe, S Takakuwa, M Saito, T Tsukagoshi, M Momose, N Ikeda, E Akiyama, Je Austermann, H Ezawa, K Fukue, M Hiramatsu, D Hughes, Y Kitamura, K Kohno, Y Kurono, Ks Scott, Gw Wilson, A Yoshida, Min Yun

Astronomy Department Faculty Publication Series

We present new, wide, and deep images in the 1.1 mm continuum and the CO ( 1–0) emission toward the northern part of the Orion A Giant Molecular Cloud (Orion-A GMC). The 1.1 mm data were taken with the AzTEC camera mounted on the Atacama Submillimeter Telescope Experiment (ASTE) 10 m telescope in Chile, and the CO ( 1–0) data were with the 25 beam receiver (BEARS) on the Nobeyama Radio Observatory (NRO) 45 m telescope in the On-The-Fly (OTF) mode. The present AzTEC observations are the widest (17 23, corresponding to 12 pc 17 pc) and the highest-sensitivity (9 …

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Detection Of Diffuse Neutral Intragroup Medium In Hickson Compact Groups, S Borthakur, Min Yun, L Verdes-Montenegro Jan 2010

Detection Of Diffuse Neutral Intragroup Medium In Hickson Compact Groups, S Borthakur, Min Yun, L Verdes-Montenegro

Astronomy Department Faculty Publication Series

We present new Green Bank Telescope (GBT) 21 cm neutral hydrogen (H I) observations of a complete distance-limited sample of 22 Hickson Compact Groups (HCGs) with at least four true members. We detected an average H I mass of 8 × 109 M (median = 6 × 109 M ), which is significantly larger than previous single-dish measurements. Consequently, the H I deficiencies for these HCGs have been reduced, although not completely eliminated. Spectral comparison of the GBT data with complementary Very Large Array data shows significant H I excess in the GBT spectra. The observed excess is …

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Herschel Observations Of Ortho- And Para-Oxidaniumyl (H2o+) In Spiral Arm Clouds Toward Sagittarius B2(M) *,**, P Schilke, Nr Erickson, Et. Al. Jan 2010

Herschel Observations Of Ortho- And Para-Oxidaniumyl (H2o+) In Spiral Arm Clouds Toward Sagittarius B2(M) *,**, P Schilke, Nr Erickson, Et. Al.

Astronomy Department Faculty Publication Series

H2O+ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all spiral arm clouds between the Sun and Sgr B2. The average o/p ratio of H2O+ in most velocity intervals is 4.8, which corresponds to a nuclear spin temperature of 21 K. The relationship of this spin temperature to the formation temperature and current physical temperature of the gas hosting H2O+ is discussed, but no firm conclusion is reached. In …

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A High-Resolution Line Survey Of Irc +10216 With Herschel/Hifi *,** First Results: Detection Of Warm Silicon Dicarbide (Sic), J Cernicharo, Lbfm Waters, L Decin, P Encrenaz, Aggm Tielens, M Agundez, E Debeck, Hsp Muller, Jr Goicoechea, Mj Barlow, A Benz, N Crimier, F Daniel, Am Digiorgio, M Fich, T Gaier, P Garcia-Lario, A Dekoter, T Khouri, R Liseau, R Lombaert, Nr Erickson, Jr Pardo, Jc Pearson, R Shipman, C Sanchez Contreras, D Teyssier Jan 2010

A High-Resolution Line Survey Of Irc +10216 With Herschel/Hifi *,** First Results: Detection Of Warm Silicon Dicarbide (Sic), J Cernicharo, Lbfm Waters, L Decin, P Encrenaz, Aggm Tielens, M Agundez, E Debeck, Hsp Muller, Jr Goicoechea, Mj Barlow, A Benz, N Crimier, F Daniel, Am Digiorgio, M Fich, T Gaier, P Garcia-Lario, A Dekoter, T Khouri, R Liseau, R Lombaert, Nr Erickson, Jr Pardo, Jc Pearson, R Shipman, C Sanchez Contreras, D Teyssier

Astronomy Department Faculty Publication Series

We present the first results of a high-spectral-resolution survey of the carbon-rich evolved star IRC+10216 that was carried out with the HIFI spectrometer onboard Herschel. This survey covers all HIFI bands, with a spectral range from 488 to 1901 GHz. In this letter we focus on the band-1b spectrum, in a spectral range 554.5–636.5 GHz, where we identified 130 spectral features with intensities above 0.03 K and a signal-to-noise ratio >5. Detected lines arise from HCN, SiO, SiS, CS, CO, metal-bearing species and, surprisingly, silicon dicarbide (SiC2). We identified 55 SiC2 transitions involving energy levels between …

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Observations Of Ozone Production In A Dissipating Tropical Convective Cell During Tc4, Gary A. Morris, A. M. Thompson, K. E. Pickering, S. Chen, E. J. Bucsela, P. A. Kucera Jan 2010

Observations Of Ozone Production In A Dissipating Tropical Convective Cell During Tc4, Gary A. Morris, A. M. Thompson, K. E. Pickering, S. Chen, E. J. Bucsela, P. A. Kucera

Gary A. Morris

From 13 July–9 August 2007, 25 ozonesondes were launched from Las Tablas, Panama as part of the Tropical Composition, Cloud, and Climate Coupling (TC4) mission. On 5 August, a strong convective cell formed in the Gulf of Panama. World Wide Lightning Location Network (WWLLN) data indicated 563 flashes (09:00–17:00 UTC) in the Gulf. NO2 data from the Ozone Monitoring Instrument (OMI) show enhancements, suggesting lightning production of NOx. At 15:05 UTC, an ozonesonde ascended into the southern edge of the now dissipating convective cell as it moved west across the Azuero Peninsula. The balloon oscillated from 2.5–5.1 km five times …

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Origins Of The Extragalactic Background At 1mm From A Combined Analysis Of The Aztec And Mambo Data In Goods-N, Kyle Penner, Alexandra Pope, Edward L. Chapin, Thomas R. Greve, Frank Bertoldi, Mark Brodwin, Ranga-Ram Chary, Christopher J, Conselice, Kristen Coppin, Mauro Giavalisco, David H. Hughes, Rob J. Ivison, Thushara Perera, Douglas Scott, Kimberly Scott, Grant Wilson Jan 2010

Origins Of The Extragalactic Background At 1mm From A Combined Analysis Of The Aztec And Mambo Data In Goods-N, Kyle Penner, Alexandra Pope, Edward L. Chapin, Thomas R. Greve, Frank Bertoldi, Mark Brodwin, Ranga-Ram Chary, Christopher J, Conselice, Kristen Coppin, Mauro Giavalisco, David H. Hughes, Rob J. Ivison, Thushara Perera, Douglas Scott, Kimberly Scott, Grant Wilson

Mauro Giavalisco

We present a study of the cosmic infrared background, which is a measure of the dust obscured activity in all galaxies in the Universe. We venture to isolate the galaxies responsible for the background at 1mm; with spectroscopic and photometric redshifts we constrain the redshift distribution of these galaxies. We create a deep 1.16mm map (sigma ~ 0.5mJy) by combining the AzTEC 1.1mm and MAMBO 1.2mm datasets in GOODS-N. This combined map contains 41 secure detections, 13 of which are new. By averaging the 1.16mm flux densities of individually undetected galaxies with 24um flux densities > 25uJy, we resolve 31--45 per …

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A Spectroscopic Search For Leaking Lyman Continuum At Z~0.7, Carrie R. Bridge, Harry I. Teplitz, Brian Siana, Claudia Scarlata, Christopher J. Conselice, Henry C. Ferguson, Thomas M. Brown, Mara Salvato, Gwen C. Rudie, Duilia F. De Mello, James Colbert, Jonathan P. Gardner, Mauro Giavalisco, Lee Armus Jan 2010

A Spectroscopic Search For Leaking Lyman Continuum At Z~0.7, Carrie R. Bridge, Harry I. Teplitz, Brian Siana, Claudia Scarlata, Christopher J. Conselice, Henry C. Ferguson, Thomas M. Brown, Mara Salvato, Gwen C. Rudie, Duilia F. De Mello, James Colbert, Jonathan P. Gardner, Mauro Giavalisco, Lee Armus

Mauro Giavalisco

We present the results of rest-frame, UV slitless spectroscopic observations of a sample of 32 z~0.7 Lyman break galaxy (LBG) analogs in the COSMOS field. The spectroscopic search was performed with the Solar Blind Channel (SBC) on Hubble Space Telescope. We report the detection of leaking Lyman continuum (LyC) radiation from an AGN-starburst composite. While we find no direct detections of LyC emission in the remainder of our sample, we achieve individual lower limits (3 sigma) of the observed non-ionizing UV to LyC flux density ratios, f_{nu}(1500A)/f_{nu}(830A) of 20 to 204 (median of 73.5) and 378.7 for the stack. Assuming …

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Improving The Estimation Of Star Formation Rates And Stellar Population Ages Of High-Redshift Galaxies From Broadband Photometry, Seong-Kook Lee, Henry C. Ferguson, Rachel S. Somerville, Tommy Wiklind, Mauro Giavalisco Jan 2010

Improving The Estimation Of Star Formation Rates And Stellar Population Ages Of High-Redshift Galaxies From Broadband Photometry, Seong-Kook Lee, Henry C. Ferguson, Rachel S. Somerville, Tommy Wiklind, Mauro Giavalisco

Mauro Giavalisco

We explore methods to improve the estimates of star formation rates and mean stellar population ages from broadband photometry of high redshift star-forming galaxies. We use synthetic spectral templates with a variety of simple parametric star formation histories to fit broadband spectral energy distributions. These parametric models are used to infer ages, star formation rates and stellar masses for a mock data set drawn from a hierarchical semi-analytic model of galaxy evolution. Traditional parametric models generally assume an exponentially declining rate of star-formation after an initial instantaneous rise. Our results show that star formation histories with a much more gradual …

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The Bright End Of The Z ~ 7 Uv Luminosity Function From A Wide And Deep Hawk-I Survey, M. Castellano, A. Fontana, D. Paris, A. Grazian, L. Pentericci, K. Boutsia, P. Santini, V. Testa, M. Dickinson, Mauro Giavalisco, R. Bouwens, J.-G. Cuby, F. Mannucci, B. Clément, S. Cristiani, F. Fiore, S. Gallozzi, E. Giallongo, R. Maiolino, N. Menci, A. Moorwood, N. Nonino, A. Renzini, P. Rosati, S. Salimbeni, E. Vanzella Jan 2010

The Bright End Of The Z ~ 7 Uv Luminosity Function From A Wide And Deep Hawk-I Survey, M. Castellano, A. Fontana, D. Paris, A. Grazian, L. Pentericci, K. Boutsia, P. Santini, V. Testa, M. Dickinson, Mauro Giavalisco, R. Bouwens, J.-G. Cuby, F. Mannucci, B. Clément, S. Cristiani, F. Fiore, S. Gallozzi, E. Giallongo, R. Maiolino, N. Menci, A. Moorwood, N. Nonino, A. Renzini, P. Rosati, S. Salimbeni, E. Vanzella

Mauro Giavalisco

(Abridged) We present here the second half of an ESO Large Programme, which exploits the unique combination of area and sensitivity provided in the near-IR by the camera Hawk-I at the VLT. We have obtained - 30 observing hours with Hawk-I in the Y-band of two high galactic latitude fields. We combined the Y-band data with deep J and K Hawk-I observations, and with FORS1/FORS2 U, B, V, R, I, and Z observations to select z-drop galaxies having Z - Y > 1, no optical detection and flat Y - J and Y - K colour terms. We detect 8 high-quality …

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The Hubble Space Telescope Goods Nicmos Survey: Overview And The Evolution Of Massive Galaxies At 1.5 < Z < 3, C. J. Conselice, A. F. L. Bluck, F. Buitrago, A. E. Bauer, R. Grützbauch, R. J. Bouwens, S. Bevan, A. Mortlock, M. Dickinson, E. Daddi, H. Yan, Douglas Scott, S. C. Chapman, R.-R. Chary, H. C. Ferguson, Mauro Giavalisco, N. Grogin, G. Illingworth, S. Jogee, A. M. Koekemoer, Ray A. Lucas, B. Mobasher, L. Moustakas, C. Papovich, S. Ravindranath, B. Siana, H. Teplitz, I. Trujillo, M. Urry, T. Weinzirl Jan 2010

The Hubble Space Telescope Goods Nicmos Survey: Overview And The Evolution Of Massive Galaxies At 1.5 < Z < 3, C. J. Conselice, A. F. L. Bluck, F. Buitrago, A. E. Bauer, R. Grützbauch, R. J. Bouwens, S. Bevan, A. Mortlock, M. Dickinson, E. Daddi, H. Yan, Douglas Scott, S. C. Chapman, R.-R. Chary, H. C. Ferguson, Mauro Giavalisco, N. Grogin, G. Illingworth, S. Jogee, A. M. Koekemoer, Ray A. Lucas, B. Mobasher, L. Moustakas, C. Papovich, S. Ravindranath, B. Siana, H. Teplitz, I. Trujillo, M. Urry, T. Weinzirl

Mauro Giavalisco

We present the details and early results from a deep near-infrared survey utilising the NICMOS instrument on the Hubble Space Telescope centred around massive M_* > 10^11 M_0 galaxies at 1.7 < z < 2.9 found within the Great Observatories Origins Deep Survey (GOODS) fields. The GOODS NICMOS Survey (GNS) was designed to obtain deep F160W (H-band) imaging of 80 of these massive galaxies, as well as other colour selected objects such as Lyman-break drop-outs, BzK objects, Distant Red Galaxies, EROs, Spitzer Selected EROs, BX/BM galaxies, as well as sub-mm galaxies. We present in this paper details of the observations, our sample selection, as well as a description of features of the massive galaxies found within our survey fields. This includes: photometric redshifts, rest-frame colours, and stellar masses. We furthermore provide an analysis of the selection methods for finding massive galaxies at high redshifts, including colour selection, and how galaxy populations selected through different methods overlap. We find that a single colour selection method cannot locate all of the massive galaxies, with no one method finding more than 70 percent. We however find that the combination of these colour methods finds nearly all the massive galaxies, as selected by photometric redshifts with the exception of apparently rare blue massive galaxies. By investigating the rest-frame (U-B) vs. M_B diagram for these galaxies we furthermore show that there exists a bimodality in colour-magnitude space at z < 2, driven by stellar mass, such that the most massive galaxies are systematically red up to z~2.5, while lower mass galaxies tend to be blue. We also discuss the number densities for galaxies with stellar masses M_* > 10^11 M_0, whereby we find an increase of a factor of eight between z = 3 and z = 1.5, demonstrating that this is an epoch when massive galaxies establish most of their mass.

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A Critical Analysis Of The Uv Luminosity Function At Redshift~7 From Deep Wfc3 Data, A. Grazian, M. Castellano, A. M. Koekemoer, A. Fontana, L. Pentericci, V. Testa, K. Boutsia, E. Giallongo, Mauro Giavalisco, P. Santini Jan 2010

A Critical Analysis Of The Uv Luminosity Function At Redshift~7 From Deep Wfc3 Data, A. Grazian, M. Castellano, A. M. Koekemoer, A. Fontana, L. Pentericci, V. Testa, K. Boutsia, E. Giallongo, Mauro Giavalisco, P. Santini

Mauro Giavalisco

The study of the Luminosity Function (LF) of Lyman Break Galaxies (LBGs) at z=7 is important for ascertaining their role in the reionization of the Universe. We perform a detailed and critical analysis of the statistical and systematic errors in the z~7 LF determination: we have assembled a large sample of candidate LBGs at z~7 from different surveys, spanning a large variety of areas and depths. In particular, we have combined data from the deep (J<27.4) and ultradeep (J<29.2) surveys recently acquired with the new WFC3 NIR camera on HST, over the GOODS-ERS and the HUDF fields, with ground based surveys in wide and shallow areas from VLT and Subaru. We have used public ACS images in the z-band to select z-dropout galaxies, and other public data both in the blue (BVI) and in the red bands to reject possible low-redshift interlopers. We have compared our results with extensive simulations to quantify the observational effects of our selection criteria as well as the effects of photometric scatter, color selections or the morphology of the candidates. We have found that the number density of faint LBGs at z~7 is only marginally sensitive to the color selection adopted, but it is strongly dependent from the assumption made on the half light distributions of the simulated galaxies, used to correct the observed sample for incompleteness. The slope of the faint end of the LBGs LF has thus a rather large uncertainty, due to the unknown distribution of physical sizes of the z~7 LBGs. We conclude that galaxies at z~7 are unable to reionize the Universe unless there is a significant evolution in the clumpiness of the IGM or in the escape fraction of ionising photons or, alternatively, there is a large population of z~7 LBGs with large physical dimensions but still not detected by the present observations.

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Candels: The Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products And Mosaics, Anton M. Koekemoer, S. M. Faber, Henry C. Ferguson, Norman A. Grogin, Dale D. Kocevski, David C. Koo, Kamson Lai, Jennifer M. Lotz, Ray. A. Lucas, Elizabeth J. Mcgrath, Sara Ogaz, Abhijith Rajan, Adam G. Riess, Steve A. Rodney, Louis Strolger, Stefano Casertano, Marco Castellano, Tomas Dahlen, Mark Dickinson, Timothy Dolch, Adriano Fontana, Mauro Giavalisco, Andrea Grazian, Yicheng Guo, Nimish P. Hathi, Kuang-Han Huang, Arjen Van Der Wel, Hao-Jing Yan, Viviana Acquaviva, David M. Alexander, Omar Almaini, Matthew L. N. Ashby, Marco Barden, Eric F. Bell, Frédéric Bournaud, Thomas M. Brown, Karina I. Caputi, Paolo Cassata, Peter Challis, Ranga-Ram Chary, Edmond Cheung, Michele Cirasuolo, Christopher J. Conselice, Asantha Roshan, Darren J. Croton, Emanuele Daddi, Romeel Davé, Dulia F. De Mello, Loic De Ravel, Avishai Dekel, Jennifer L. Donley, James S. Dunlop, Aaron A. Dutton, David Elbaz, Giovanni G. Fazio, Alex F. Filippenko, Steven L. Finkelstein, Chris Frazer, Jonathan P. Gardner, Peter M. Garnavich, Eric Gawiser, Ruth Gruetzbauch, Will G. Hartley, Boris Häussler, Jessica Herrington, Philip F. Hopkins, Jia-Sheng Huang, Saurabh Jha, Andrew Johnson, Jeyhan S. Kartaltepe, Ali Ahmad Khostovan, Robert P. Kirshner, Caterina Lani, Kyoung-Soo Lee, Weidong Li, Piero Madau, Patrick J. Mccarthy, Daniel H. Mcintosh, Ross J. Mclure, Conor Mcpartland, Bahram Mobasher, Heidi Moreira, Alice Mortlock, Leonidas A. Moustakas, Mark Mozena, Kirpal Nandra, Jeffrey A. Newman, Jennifer L. Nielsen, Sami Niemi, Kai G. Noeske, Casey J. Papovich, Laura Pentericci, Alexandra Pope, Joel R. Primack, Swara Ravindranath, Naveen A. Reddy, Alvio Renzini, Hans-Walter Rix, Aday R. Robaina, David J. Rosario, Piero Rosati, Sara Salimbeni, Claudia Scarlata, Brian Siana, Luc Simard, Joseph Smidt, Diana Snyder, Rachel S. Somerville, Hyron Spinrad, Amber N. Straughn, Olivia Telford, Harry I. Teplitz, Jonathan R. Trump, Carlos Vargas, Carolin Villforth, Cory R. Wagner, Pat Wandro, Risa H. Wechsler, Benjamin J. Weiner, Tommy Wiklind, Vivienne Wild, Grant Wilson, Stijn Wuyts, Min S. Yun Jan 2010

Candels: The Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products And Mosaics, Anton M. Koekemoer, S. M. Faber, Henry C. Ferguson, Norman A. Grogin, Dale D. Kocevski, David C. Koo, Kamson Lai, Jennifer M. Lotz, Ray. A. Lucas, Elizabeth J. Mcgrath, Sara Ogaz, Abhijith Rajan, Adam G. Riess, Steve A. Rodney, Louis Strolger, Stefano Casertano, Marco Castellano, Tomas Dahlen, Mark Dickinson, Timothy Dolch, Adriano Fontana, Mauro Giavalisco, Andrea Grazian, Yicheng Guo, Nimish P. Hathi, Kuang-Han Huang, Arjen Van Der Wel, Hao-Jing Yan, Viviana Acquaviva, David M. Alexander, Omar Almaini, Matthew L. N. Ashby, Marco Barden, Eric F. Bell, Frédéric Bournaud, Thomas M. Brown, Karina I. Caputi, Paolo Cassata, Peter Challis, Ranga-Ram Chary, Edmond Cheung, Michele Cirasuolo, Christopher J. Conselice, Asantha Roshan, Darren J. Croton, Emanuele Daddi, Romeel Davé, Dulia F. De Mello, Loic De Ravel, Avishai Dekel, Jennifer L. Donley, James S. Dunlop, Aaron A. Dutton, David Elbaz, Giovanni G. Fazio, Alex F. Filippenko, Steven L. Finkelstein, Chris Frazer, Jonathan P. Gardner, Peter M. Garnavich, Eric Gawiser, Ruth Gruetzbauch, Will G. Hartley, Boris Häussler, Jessica Herrington, Philip F. Hopkins, Jia-Sheng Huang, Saurabh Jha, Andrew Johnson, Jeyhan S. Kartaltepe, Ali Ahmad Khostovan, Robert P. Kirshner, Caterina Lani, Kyoung-Soo Lee, Weidong Li, Piero Madau, Patrick J. Mccarthy, Daniel H. Mcintosh, Ross J. Mclure, Conor Mcpartland, Bahram Mobasher, Heidi Moreira, Alice Mortlock, Leonidas A. Moustakas, Mark Mozena, Kirpal Nandra, Jeffrey A. Newman, Jennifer L. Nielsen, Sami Niemi, Kai G. Noeske, Casey J. Papovich, Laura Pentericci, Alexandra Pope, Joel R. Primack, Swara Ravindranath, Naveen A. Reddy, Alvio Renzini, Hans-Walter Rix, Aday R. Robaina, David J. Rosario, Piero Rosati, Sara Salimbeni, Claudia Scarlata, Brian Siana, Luc Simard, Joseph Smidt, Diana Snyder, Rachel S. Somerville, Hyron Spinrad, Amber N. Straughn, Olivia Telford, Harry I. Teplitz, Jonathan R. Trump, Carlos Vargas, Carolin Villforth, Cory R. Wagner, Pat Wandro, Risa H. Wechsler, Benjamin J. Weiner, Tommy Wiklind, Vivienne Wild, Grant Wilson, Stijn Wuyts, Min S. Yun

Mauro Giavalisco

This paper describes the Hubble Space Telescope imaging data products and data reduction procedures for the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). This survey is designed to document the evolution of galaxies and black holes at $z\sim1.5-8$, and to study Type Ia SNe beyond $z>1.5$. Five premier multi-wavelength sky regions are selected, each with extensive multiwavelength observations. The primary CANDELS data consist of imaging obtained in the Wide Field Camera 3 / infrared channel (WFC3/IR) and UVIS channel, along with the Advanced Camera for Surveys (ACS). The CANDELS/Deep survey covers \sim125 square arcminutes within GOODS-N and GOODS-S, …

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A High Resolution Line Survey Of Irc +10216 With Herschel/Hifi, Robin Lombaert, Jose Cenicharo, L.B.F.M. Waters, Leen Decin, Pierre Encrenaz, A.G.G.M. Tielens, Marcelino Agundez, Elvire De Beck, Holger S.P. Muller, Javier R. Goicoechea, Michael J. Barlow, Arnold Benz, Nicolas Crimier, Fabien Daniel, Anna Maria Di Giorgio, Michael Fich, Todd Gaier, Pedro Garcia-Lario, Alex De Koter, Theo Khouri, Rene Liseau, Neal A. Erickson, Juan R. Pardo, John C. Pearson, Russell Shipman, Carmen Sanchez Contreras, David Teyssier Jan 2010

A High Resolution Line Survey Of Irc +10216 With Herschel/Hifi, Robin Lombaert, Jose Cenicharo, L.B.F.M. Waters, Leen Decin, Pierre Encrenaz, A.G.G.M. Tielens, Marcelino Agundez, Elvire De Beck, Holger S.P. Muller, Javier R. Goicoechea, Michael J. Barlow, Arnold Benz, Nicolas Crimier, Fabien Daniel, Anna Maria Di Giorgio, Michael Fich, Todd Gaier, Pedro Garcia-Lario, Alex De Koter, Theo Khouri, Rene Liseau, Neal A. Erickson, Juan R. Pardo, John C. Pearson, Russell Shipman, Carmen Sanchez Contreras, David Teyssier

Neal Erickson

We present the first results of a high-spectral-resolution survey of the carbon-rich evolved star IRC+10216 that was carried out with the HIFI spectrometer onboard Herschel. This survey covers all HIFI bands, with a spectral range from 488 to 1901 GHz. In this letter we focus on the band-1b spectrum, in a spectral range 554.5 − 636.5 GHz, where we identified 130 spectral features with intensities above 0.03K and a signal–to– noise ratio >5. Detected lines arise from HCN, SiO, SiS, CS, CO, metal-bearing species and, surprisingly, silicon dicarbide (SiC2). We identified 55 SiC2 transitions involving energy levels between 300 and …

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A Z=1.82 Analog Of Local Ultra-Massive Elliptical Galaxies, M. Onodera, E. Daddi, R. Gobat, M. Cappellari, N. Arimoto, A. Renzini, Y. Yamada, H. J. Mccracken, C. Mancini, P. Capak, M. Carollo, A. Cimatti, Mauro Giavalisco, O. Ilbert, X. Kong, S. Lilly, K. Motohara, K. Ohta, D. B. Sanders, N. Scoville, N. Tamura, Y. Taniguchi Jan 2010

A Z=1.82 Analog Of Local Ultra-Massive Elliptical Galaxies, M. Onodera, E. Daddi, R. Gobat, M. Cappellari, N. Arimoto, A. Renzini, Y. Yamada, H. J. Mccracken, C. Mancini, P. Capak, M. Carollo, A. Cimatti, Mauro Giavalisco, O. Ilbert, X. Kong, S. Lilly, K. Motohara, K. Ohta, D. B. Sanders, N. Scoville, N. Tamura, Y. Taniguchi

Mauro Giavalisco

We present observations of a very massive galaxy at z=1.82 which show that its morphology, size, velocity dispersion and stellar population properties that are fully consistent with those expected for passively evolving progenitors of today's giant ellipticals. These findings are based on a deep optical rest-frame spectrum obtained with the Multi-Object InfraRed Camera and Spectrograph (MOIRCS) on the Subaru telescope of a high-z passive galaxy candidate (pBzK) from the COSMOS field, for which we accurately measure its redshift of z=1.8230 and obtain an upper limit on its velocity dispersion sigma_star<326 km/s. By detailed stellar population modeling of both the galaxy broad-band SED and the rest-frame optical spectrum we derive a star-formation-weighted age and formation redshift of t_sf~1-2 Gyr and z_form~2.5-4, and a stellar mass of M_star~(3-4)x10^{11} M_sun. This is in agreement with a virial mass limit of M_vir<7x10^{11}M_sun, derived from the measured sigma_star value and stellar half-light radius, as well as with the dynamical mass limit based on the Jeans equations. In contrast with previously reported super-dense passive galaxies at z~2, the present galaxy at z=1.82 appears to have both size and velocity dispersion similar to early-type galaxies in the local Universe with similar stellar mass. This suggests that z~2 massive and passive galaxies may exhibit a wide range of properties, then possibly following quite different evolutionary histories from z~2 to z=0.

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A Detailed Study Of Photometric Redshifts For Goods-South Galaxies, Tomas Dahlen, Bahram Mobasher, Mark Dickinson, Henry C. Ferguson, Mauro Giavalisco, Norman A. Grogin, Yicheng Guo, Anton Koekemoer, Kyoung-Soo Lee, Seong-Kook Lee, Mario Nonino, Adam G. Reiss, Sara Salimbeni Jan 2010

A Detailed Study Of Photometric Redshifts For Goods-South Galaxies, Tomas Dahlen, Bahram Mobasher, Mark Dickinson, Henry C. Ferguson, Mauro Giavalisco, Norman A. Grogin, Yicheng Guo, Anton Koekemoer, Kyoung-Soo Lee, Seong-Kook Lee, Mario Nonino, Adam G. Reiss, Sara Salimbeni

Mauro Giavalisco

We use the deepest and the most comprehensive photometric data currently available for GOODS-South galaxies to measure their photometric redshifts. The photometry includes VLT/VIMOS (U-band), HST/ACS (F435W, F606W, F775W, and F850LP bands), VLT/ISAAC (J-, H-, and Ks-bands), and four Spitzer/IRAC channels (3.6, 4.5, 5.8, and 8.0 micron). The catalog is selected in the z-band (F850LP) and photometry in each band is carried out using the recently completed TFIT algorithm, which performs PSF matched photometry uniformly across different instruments and filters, despite large variations in PSFs and pixel scales. Photometric redshifts are derived using the GOODZ code, which is based on …

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A Deep Hst Search For Escaping Lyman Continuum Flux At Z~1.3: Evidence For An Evolving Ionizing Emissivity, Brian Siana, Harry I. Teplitz, Henry C. Ferguson, Thomas M. Brown, Mauro Giavalisco, Mark Dickinson, Carrie R. Bridge, Ranga-Ram Chary, Duilia F. De Mello, Christopher J. Conselice, Jonathan P. Gardner, James W. Colbert, Claudia Scarlata Jan 2010

A Deep Hst Search For Escaping Lyman Continuum Flux At Z~1.3: Evidence For An Evolving Ionizing Emissivity, Brian Siana, Harry I. Teplitz, Henry C. Ferguson, Thomas M. Brown, Mauro Giavalisco, Mark Dickinson, Carrie R. Bridge, Ranga-Ram Chary, Duilia F. De Mello, Christopher J. Conselice, Jonathan P. Gardner, James W. Colbert, Claudia Scarlata

Mauro Giavalisco

We have obtained deep Hubble Space Telescope far-UV images of 15 starburst galaxies at z~1.3 in the GOODS fields to search for escaping Lyman continuum photons. These are the deepest far-UV images m_{AB}=28.7, 3\sigma, 1" diameter) over this large an area (4.83 arcmin^2) and provide the best escape fraction constraints for any galaxy at any redshift. We do not detect any individual galaxies, with 3\sigma limits to the Lyman Continuum (~700 \AA) flux 50--149 times fainter (in f_nu) than the rest-frame UV (1500 \AA) continuum fluxes. Correcting for the mean IGM attenuation (factor ~2), as well as an intrinsic stellar …

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Science Drivers And Requirements For An Advanced Technology Large Aperture Space Telescope (Atlast): Implications For Technology Development And Synergies With Other Future Facilities, Marc Postman, Tom Brown, Kenneth Sembach, Mauro Giavalisco, Wesley Traub, Karl Stapelfeldt, Daniela Calzetti, William Oegerle, R. Michael Rich, Phillip Stahl, Jason Tumlinson, Matt Mountain, Rémi Soummer, Tupper Hyde Jan 2010

Science Drivers And Requirements For An Advanced Technology Large Aperture Space Telescope (Atlast): Implications For Technology Development And Synergies With Other Future Facilities, Marc Postman, Tom Brown, Kenneth Sembach, Mauro Giavalisco, Wesley Traub, Karl Stapelfeldt, Daniela Calzetti, William Oegerle, R. Michael Rich, Phillip Stahl, Jason Tumlinson, Matt Mountain, Rémi Soummer, Tupper Hyde

Mauro Giavalisco

The Advanced Technology Large-Aperture Space Telescope (ATLAST) is a concept for an 8-meter to 16-meter UVOIR space observatory for launch in the 2025-2030 era. ATLAST will allow astronomers to answer fundamental questions at the forefront of modern astronphysics, including "Is there life elsewhere in the Galaxy?" We present a range of science drivers that define the main performance requirements for ATLAST (8 to 16 milliarcsec angular resolution, diffraction limited imaging at 0.5 {\mu}m wavelength, minimum collecting area of 45 square meters, high sensitivity to light wavelengths from 0.1 {\mu}m to 2.4 {\mu}m, high stability in wavefront sensing and control). We …

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Spectroscopic Confirmation Of Z~7 Lbgs: Probing The Earliest Galaxies And The Epoch Of Reionization, L. Pentericci, A. Fontana, E. Vanzella, M. Castellano, A. Grazian, M. Dijkstra, K. Boustia, S. Cristiani, M. Dickinson, E. Giallongo, Mauro Giavalisco, R. Maiolino, A. Moorwood, P. Santini Jan 2010

Spectroscopic Confirmation Of Z~7 Lbgs: Probing The Earliest Galaxies And The Epoch Of Reionization, L. Pentericci, A. Fontana, E. Vanzella, M. Castellano, A. Grazian, M. Dijkstra, K. Boustia, S. Cristiani, M. Dickinson, E. Giallongo, Mauro Giavalisco, R. Maiolino, A. Moorwood, P. Santini

Mauro Giavalisco

We present the final results from our ultra-deep spectroscopic campaign with FORS2 at the ESO/VLT for the confirmation of z~7 "z--band dropout" candidates selected from our VLT/Hawk-I imaging survey over three independent fields. In particular we report on two newly discovered galaxies at redshift ~6.7 in the NTT deep field: both galaxies show a Ly-alpha emission line with rest-frame EWs of the order 15-20 A and luminosities of 2-4 X 10^{42} erg/s. We also present the results of ultra-deep observations of a sample of i-dropout galaxies, from which we set a solid upper limit on the fraction of interlopers. Out …

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The Lack Of Intense Lyman~Alpha In Ultradeep Spectra Of Z=7 Candidates In Goods-S: Imprint Of Reionization?, A. Fontana, E. Vanzella, L. Pentericci, M. Castellano, Mauro Giavalisco, A. Grazian, K. Boutsia, S. Christiani, M. Dickinson, E. Giallongo, M. Maiolino, A. Moorwood, P. Santini Jan 2010

The Lack Of Intense Lyman~Alpha In Ultradeep Spectra Of Z=7 Candidates In Goods-S: Imprint Of Reionization?, A. Fontana, E. Vanzella, L. Pentericci, M. Castellano, Mauro Giavalisco, A. Grazian, K. Boutsia, S. Christiani, M. Dickinson, E. Giallongo, M. Maiolino, A. Moorwood, P. Santini

Mauro Giavalisco

We present ultradeep optical spectroscopy obtained with FORS2 on VLT of seven Lyman-break galaxy (LBG) candidates at z>6.5 selected in the GOODS-S field from Hawk-I/VLT and WFC3/HST imaging. For one galaxy we detect a low significance emission line (S/N< 7), located at 9691.5 +/- 0.5A and with flux 3.4 x 10^(-18)erg/cm^2/s. If identified as Lyman alpha, it places the LBG at redshift z=6.972+/- 0.002, with a rest-frame equivalent width EW}=13A. Using Monte Carlo simulations and conservative EW distribution functions at 210 is ~ 2%, and that of observing only one galaxy out of seven with S/N=5 is ~4%, but these can be as small as ~1E-3, depending on the details of the EW distribution. We conclude that either a significant fraction of the candidates is not at high redshift or that some physical mechanism quenches the Lyman alpha emission emerging from the galaxies at z>6.5, abruptly reversing the trend of the increasing fraction of strong emitters with increasing redshift observed up to z~ 6.5. We discuss the possibility that an increasingly neutral intergalactic medium is responsible for such quenching.

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Spectroscopic Confirmation Of Two Lyman Break Galaxies At Redshift Beyond 7, E. Vanzella, L. Pentericci, A. Fontana, A. Grazian, M. Castellano, K. Boutsia, S. Cristiani, M. Dickinson, S. Gallozzi, E. Giallongo, Mauro Giavalisco, R. Maiolino, A. Moorwood, D. Paris, P. Santini Jan 2010

Spectroscopic Confirmation Of Two Lyman Break Galaxies At Redshift Beyond 7, E. Vanzella, L. Pentericci, A. Fontana, A. Grazian, M. Castellano, K. Boutsia, S. Cristiani, M. Dickinson, S. Gallozzi, E. Giallongo, Mauro Giavalisco, R. Maiolino, A. Moorwood, D. Paris, P. Santini

Mauro Giavalisco

We report the spectroscopic confirmation of two Lyman break galaxies at redshift > 7. The galaxies were observed as part of an ultra-deep spectroscopic campaign with FORS2 at the ESO/VLT for the confirmation of z~7 ``z--band dropout'' candidates selected from our VLT/Hawk-I imaging survey. Both galaxies show a prominent emission line at 9735A and 9858A respectively: the lines have fluxes of ~ 1.6-1.2 x 10^(-17) erg/s/cm2 and exhibit a sharp decline on the blue side and a tail on the red side. The asymmetry is quantitatively comparable to the observed asymmetry in z ~ 6 Ly-alpha lines, where absorption by neutral …

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The Rising Star-Formation Histories Of Distant Galaxies And Implications For Gas Accretion With Time, Casey Papovich, Steven L. Finkelstein, Henry C. Ferguson, Jennifer M. Lotz, Mauro Giavalisco Jan 2010

The Rising Star-Formation Histories Of Distant Galaxies And Implications For Gas Accretion With Time, Casey Papovich, Steven L. Finkelstein, Henry C. Ferguson, Jennifer M. Lotz, Mauro Giavalisco

Mauro Giavalisco

Distant galaxies show correlations between their current star-formation rates (SFRs) and stellar masses, implying that their star-formation histories (SFHs) are highly similar. Moreover, observations show that the UV luminosities and stellar masses grow from z=8 to 3, implying that the SFRs increase with time. We compare the cosmologically averaged evolution in galaxies at 3 < z < 8 at constant comoving number density, n = 2 x 10^-4 Mpc^-3. This allows us to study the evolution of stellar mass and star formation in the galaxy predecessors and descendants in ways not possible using galaxies selected at constant stellar mass or SFR, quantities that evolve strongly in time. We show that the average SFH of these galaxies increase smoothly from z=8 to 3 as SFR ~ t^alpha with alpha = 1.7 +/- 0.2. This conflicts with assumptions that the SFR is either constant or declines exponentially in time. We show that the stellar mass growth in these galaxies is consistent with this derived SFH. This provides evidence that the slope of the high-mass end of the IMF is approximately Salpeter unless the duty cycle of star formation is much less than unity. We argue that these relations follow from gas accretion (either through accretion or delivered by mergers) coupled with galaxy disk growth under the assumption that the SFR depends on the local gas surface density. This predicts that gas fractions decrease from z=8 to 3 on average as f_gas ~ (1+z)^0.9 for galaxies with this number density. The implied galaxy gas accretion rates at z > 4 are as fast and may even exceed the SFR: this is the "gas accretion epoch". At z < 4 the SFR overtakes the implied gas accretion rate, indicating a period where galaxies consume gas faster than it is acquired. At z < 3, galaxies with this number density depart from these relations implying that star formation and gas accretion are slowed at later times.

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Deep 1.1 Mm-Wavelength Imaging Of The Goods-S Field By Aztec/Aste - I. Source Catalogue And Number Counts, K. S. Scott, M. S. Yun, G. W. Wilson, J. E. Austermann, E. Aguilar, I. Aretxaga, H. Ezawa, D. Ferrusca, B. Hatsukade, D. H. Hughes, D. Iono, Mauro Giavalisco, R. Kawabe, K. Kohno, P. D. Masukopf, T. Oshima, T. A. Perera, J. Rand, Y. Tamura, T. Tosaki, M Velazquez, C. C. Williams, M. Zeballos Jan 2010

Deep 1.1 Mm-Wavelength Imaging Of The Goods-S Field By Aztec/Aste - I. Source Catalogue And Number Counts, K. S. Scott, M. S. Yun, G. W. Wilson, J. E. Austermann, E. Aguilar, I. Aretxaga, H. Ezawa, D. Ferrusca, B. Hatsukade, D. H. Hughes, D. Iono, Mauro Giavalisco, R. Kawabe, K. Kohno, P. D. Masukopf, T. Oshima, T. A. Perera, J. Rand, Y. Tamura, T. Tosaki, M Velazquez, C. C. Williams, M. Zeballos

Mauro Giavalisco

[Abridged] We present the first results from a 1.1 mm confusion-limited map of the GOODS-S field taken with AzTEC on the ASTE telescope. We imaged a 270 sq. arcmin field to a 1\sigma depth of 0.48 - 0.73 mJy/beam, making this one of the deepest blank-field surveys at mm-wavelengths ever achieved. Although our GOODS-S map is extremely confused, we demonstrate that our source identification and number counts analyses are robust, and the techniques discussed in this paper are relevant for other deeply confused surveys. We find a total of 41 dusty starburst galaxies with S/N >= 3.5 within this uniformly …

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