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Properties Of Compact 250 Μm Emission And H Ii Regions In M 33 (Herm33es)*, S Verley, M Relaño, C Kramer, E Xilouris, M Boquien, D Calzetti 2010 University of Massachusetts - Amherst

Properties Of Compact 250 Μm Emission And H Ii Regions In M 33 (Herm33es)*, S Verley, M Relaño, C Kramer, E Xilouris, M Boquien, D Calzetti

Astronomy Department Faculty Publication Series

Aims. Within the framework of the HERM33ES key program, using the high resolution and sensitivity of the Herschel photometric data, we study the compact emission in the Local Group spiral galaxy M 33 to investigate the nature of the compact SPIRE emission sources. We extracted a catalogue of sources at 250 μm in order to investigate the nature of this compact emission. Taking advantage of the unprecedented Herschel resolution at these wavelengths, we also focus on a more precise study of some striking Hα shells in the northern part of the galaxy. Methods. We present a catalogue of 159 compact ...


The Hubble Space Telescope Wide Field Camera 3 Early Release Science Data: Panchromatic Faint Object Counts From 0.2{2 Microns Wavelength, R Windhorst, S Cohen, N Hathi, P McCarthy JR, R Ryan, H Yan, I Baldry, S Driver, J Frogel, D Hill, L Kelvin, A Koekemoer, M Mechtley, R O'Connell, A Robotham, M Rutkowski, M Seibert, R Tuffs, B Balick, H Bond, H Bushouse, D Calzetti 2010 University of Massachusetts - Amherst

The Hubble Space Telescope Wide Field Camera 3 Early Release Science Data: Panchromatic Faint Object Counts From 0.2{2 Microns Wavelength, R Windhorst, S Cohen, N Hathi, P Mccarthy Jr, R Ryan, H Yan, I Baldry, S Driver, J Frogel, D Hill, L Kelvin, A Koekemoer, M Mechtley, R O'Connell, A Robotham, M Rutkowski, M Seibert, R Tuffs, B Balick, H Bond, H Bushouse, D Calzetti

Astronomy Department Faculty Publication Series

We describe the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) Early Re- lease Science (ERS) observations in the Great Observatories Origins Deep Survey (GOODS) South eld. The new WFC3 ERS data provide calibrated, drizzled mosaics in the mid-UV lters F225W, F275W, and F336W, as well as in the near-IR lters F098W (Ys), F125W (J), and F160W (H) in 1{2 HST orbits per lter. Together with the existing HST Advanced Camera for Surveys (ACS) GOODS-South mosaics in the BVi'z' lters, these panchromatic 10-band ERS data cover 40{50 square arcmin from from 0.2-1.7 m in ...


Nearby Galaxies With Spitzer, D Calzetti 2010 University of Massachusetts - Amherst

Nearby Galaxies With Spitzer, D Calzetti

Astronomy Department Faculty Publication Series

We review the main advances brought by the Spitzer Space Telescope in the field of nearby galaxies studies, concentrating on a few subject areas, including: (1) the physics of the Polycyclic Aromatic Hydrocarbons that generate the mid–infrared features between 3.5 ìm and 20 ìm; (2) the use of the mid– and far–infrared emission from galaxies as star formation rate indicators; and (3) the improvement of mid–infrared diagnostics to discriminate between thermal (star–formation)and non–thermal (AGN) emission in galaxies and galaxy centers.


Hubble Space Telescope Imaging Of Lyman Alpha Emission At Z = 4.41, S FINKELSTEIN, S COHEN, R WINDHORST, R RYAN, N HATHI, K FINKELSTEIN, J ANDERSON, N GROGIN, A KOEKEMOER, S MALHOTRA, M MUTCHLER, J RHOADS, P MCCARTHY, R O’CONNELL, B Balick, H BOND, D Calzetti 2010 University of Massachusetts - Amherst

Hubble Space Telescope Imaging Of Lyman Alpha Emission At Z = 4.41, S Finkelstein, S Cohen, R Windhorst, R Ryan, N Hathi, K Finkelstein, J Anderson, N Grogin, A Koekemoer, S Malhotra, M Mutchler, J Rhoads, P Mccarthy, R O’Connell, B Balick, H Bond, D Calzetti

Astronomy Department Faculty Publication Series

We present the highest redshift detections of resolved Ly emission, using Hubble Space Telescope/ACS F658N narrowband-imaging data taken in parallel with the Wide Field Camera 3 Early Release Science program in the GOODS CDF-S. We detect Ly emission from three spectroscopically confirmed z = 4.4 Ly emitting galaxies (LAEs), more than doubling the sample of LAEs with resolved Ly emission. Comparing the light distribution between the rest-frame ultraviolet continuum and narrowband images, we investigate the escape of Ly photons at high redshift. While our data do not support a positional offset between the Ly and rest-frame ultraviolet (UV) continuum ...


Exoptf Science Uniquely Enabled By Far-Ir Interferometry: Probing The Formation Of Planetary Systems, And Finding And Characterizing Exoplanets, D Leisawitz, T Armstrong, C Benderb, D Benford, D Calzetti 2010 University of Massachusetts Amherst

Exoptf Science Uniquely Enabled By Far-Ir Interferometry: Probing The Formation Of Planetary Systems, And Finding And Characterizing Exoplanets, D Leisawitz, T Armstrong, C Benderb, D Benford, D Calzetti

Astronomy Department Faculty Publication Series

By providing sensitive sub-arcsecond images and integral field spectroscopy in the 25 – 400 ìm wavelength range, a far-IR interferometer will revolutionize our understanding of planetary system formation, reveal otherwise-undetectable planets through the disk perturbations they induce, and spectroscopically probe the atmospheres of extrasolar giant planets in orbits typical of most of the planets in our solar system. The technical challenges associated with interferometry in the far-IR are greatly relaxed relative to those encountered at shorter wavelengths or when starlight nulling is required. A structurally connected far-IR interferometer with a maximum baseline length of 36 m can resolve the interesting spatial ...


Uv-Dropout Galaxies In The Goods-South Field From Wfc3 Early Release Science Observations, N Hathi, R Ryan, S Cohen, H Yan, R Windhorst, P McCarthy, R O'Connell, A Koekemoer, M Rutkowsk, B Balick, H Bond, D Calzetti 2010 University of Massachusetts - Amherst

Uv-Dropout Galaxies In The Goods-South Field From Wfc3 Early Release Science Observations, N Hathi, R Ryan, S Cohen, H Yan, R Windhorst, P Mccarthy, R O'Connell, A Koekemoer, M Rutkowsk, B Balick, H Bond, D Calzetti

Astronomy Department Faculty Publication Series

We combine new high sensitivity ultraviolet (UV) imaging from the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) with existing deep HST/Advanced Camera for Surveys optical images from the Great Observatories Origins Deep Survey (GOODS) program to identify UV-dropouts, which are Lyman break galaxy (LBG) candidates at z sime 1-3. These new HST/WFC3 observations were taken over 50 arcmin2 in the GOODS-South field as a part of the Early Release Science program. The uniqueness of these new UV data is that they are observed in three UV/optical (WFC3 UVIS) channel filters (F225W, F275W, and ...


Structure And Evolution Of The Opacity Of Spiral Disks, B Holwerda, R González, W Keel, D Calzetti 2010 University of Massachusetts - Amherst

Structure And Evolution Of The Opacity Of Spiral Disks, B Holwerda, R González, W Keel, D Calzetti

Astronomy Department Faculty Publication Series

The opacity of a spiral disk due to dust absorption influences every measurement we make of it in the UV and optical. Two separate techniques directly measure the total absorption by dust in the disk: calibrated distant galaxy counts and overlapping galaxy pairs. The main results from both so far are a semi-transparent disk with more opaque arms and a relation between surface brightness and disk opacity. In the Spitzer era, spectral energy distribution models of spiral disks add a new perspective on the role of dust in spiral disks. Combined with the overall opacity from galaxy counts, we can ...


Setting The Normalcy Level Of Hi Properties In Isolated Galaxies, D Espada, L Verdes-Montenegro, E Athanassoula, A Bosma, WK Huchtmeier, S Leon, U Lisenfeld, J Sabater, J Sulentic, S Verley, Min Yun 2010 University of Massachusetts - Amherst

Setting The Normalcy Level Of Hi Properties In Isolated Galaxies, D Espada, L Verdes-Montenegro, E Athanassoula, A Bosma, Wk Huchtmeier, S Leon, U Lisenfeld, J Sabater, J Sulentic, S Verley, Min Yun

Astronomy Department Faculty Publication Series

Studying the atomic gas (HI) properties of the most isolated galaxies is essential to quantify the effect that the environment exerts on this sensitive component of the interstellar medium. We observed and compiled HI data for a well defined sample of ∼ 800 galaxies in the Catalog of Isolated Galaxies, as part of the AMIGA project (Analysis of the ISM in Isolated GAlaxies, http://amiga.iaa.es), which enlarges considerably previous samples used to quantify the HI deficiency in galaxies located in denser environments. By studying the shape of 182 HI profiles, we revisited the usually accepted result that, independently of ...


Detection Of Oh+ And H2o+ Towards Orion Kl, M Gupta, P Rimmer, JC Pearson, S Yu, E Herbst, N Marada, EA Bergin, DA Neufeld, GJ Melnick, R Bachiller, W Baechtold, TA Bell, GA Blake, E Caux, C Ceccarelli, J Cernicharo, G Chattopadhyay, C Comito, S Cabrit, NR Crockett, F Daniel, E Falgarone, MC Diez-Gonzalez, ML Dubernet, NR Erickson, M Emprechtinger, P Encrenaz, M Gerin, JJ Gill, TF Giesen, JR Goicoechea, PF Goldsmith, C Joblin, D Johnstone, WD Langer, B Larsson, WB Latter, RH Lin, DC Lis, R Lieseau, SD Lord, FW Maiwald, S Maret, PG Martin, J Martin-Pintado, KM Menten, P Morris, HSP Muller, JA Murphy, LH Nordh, M Olberg, V Ossenkopf, L Pagani, M Perault, TG Phillips, R Plume, SL Qin, M Salez, LA Samoska, P Schilke, E Schlecht, R Szczerba, J Stutzki, N Trappe, FFS van der Tak, C Vastel, S Wang, HW Yorke, J Zmuidzinas, A Boogert, R Gusten, P Hartogh, N Honingh, A Karpov, J Kooi, JM Krieg, R Schieder, P Zaal 2010 University of Massachusetts - Amherst

Detection Of Oh+ And H2o+ Towards Orion Kl, M Gupta, P Rimmer, Jc Pearson, S Yu, E Herbst, N Marada, Ea Bergin, Da Neufeld, Gj Melnick, R Bachiller, W Baechtold, Ta Bell, Ga Blake, E Caux, C Ceccarelli, J Cernicharo, G Chattopadhyay, C Comito, S Cabrit, Nr Crockett, F Daniel, E Falgarone, Mc Diez-Gonzalez, Ml Dubernet, Nr Erickson, M Emprechtinger, P Encrenaz, M Gerin, Jj Gill, Tf Giesen, Jr Goicoechea, Pf Goldsmith, C Joblin, D Johnstone, Wd Langer, B Larsson, Wb Latter, Rh Lin, Dc Lis, R Lieseau, Sd Lord, Fw Maiwald, S Maret, Pg Martin, J Martin-Pintado, Km Menten, P Morris, Hsp Muller, Ja Murphy, Lh Nordh, M Olberg, V Ossenkopf, L Pagani, M Perault, Tg Phillips, R Plume, Sl Qin, M Salez, La Samoska, P Schilke, E Schlecht, R Szczerba, J Stutzki, N Trappe, Ffs Van Der Tak, C Vastel, S Wang, Hw Yorke, J Zmuidzinas, A Boogert, R Gusten, P Hartogh, N Honingh, A Karpov, J Kooi, Jm Krieg, R Schieder, P Zaal

Astronomy Department Faculty Publication Series

We report observations of the reactive molecular ions OH+, H2O+, and H3O+ towards Orion KL with Herschel/HIFI. All three N = 1-0 fine-structure transitions of OH+ at 909, 971, and 1033 GHz and both fine-structure components of the doublet ortho-H2O+ 111–000 transition at 1115 and 1139 GHz were detected; an upper limit was obtained for H3O+. OH+ and H2O+ are observed purely in absorption, showing a narrow component at the source velocity of 9 km s-1, and a broad blueshifted absorption similar to that reported ...


Westerbork Ultra-Deep Survey Of Hi At Z=0.2, M Verheijen, B Deshev, J van Gorkom, B Poggianti, A Chung, R Cybulski, KS Dawarakanath, M Montero-Castano, G Morrison, D Schiminovich, A Szomoru, Min Yun 2010 University of Massachusetts - Amherst

Westerbork Ultra-Deep Survey Of Hi At Z=0.2, M Verheijen, B Deshev, J Van Gorkom, B Poggianti, A Chung, R Cybulski, Ks Dawarakanath, M Montero-Castano, G Morrison, D Schiminovich, A Szomoru, Min Yun

Astronomy Department Faculty Publication Series

In this contribution, we present some preliminary observational results from the completed ultra-deep survey of 21cm emission from neutral hydrogen at redshifts z=0.164-0.224 with the Westerbork Synthesis Radio Telescope. In two separate fields, a total of 160 individual galaxies has been detected in neutral hydrogen, with HI masses varying from 1.1x10^9 to 4.0x10^10 Msun. The largest galaxies are spatially resolved by the synthesized beam of 23x37 arcsec^2 while the velocity resolution of 19 km/s allowed the HI emission lines to be well resolved. The large scale structure in the surveyed volume ...


2010 Solar And Space Physics Decadal Survey White Paper: Next Steps In Solar Spectral Irradiance Studies, Mark P. Rast, Jerald W. Harder, Roberto Casini, Serena Criscuoli, Ilaria Ermolli, Juan Fontenla, Hanli Liu, Scott W. McIntosh, Carolus J. Schrijver, Han Uitenbroek 2010 University of Colorado, Boulder

2010 Solar And Space Physics Decadal Survey White Paper: Next Steps In Solar Spectral Irradiance Studies, Mark P. Rast, Jerald W. Harder, Roberto Casini, Serena Criscuoli, Ilaria Ermolli, Juan Fontenla, Hanli Liu, Scott W. Mcintosh, Carolus J. Schrijver, Han Uitenbroek

Astrophysical & Planetary Sciences Faculty Contributions

Understanding the physical causes underlying solar spectral irradiance variations and the impact of these variations on terrestrial climate remain critical compelling challenges. On the solar side, the most fundamental unknown is the role of the “quiet-sun7 ,” a question brought into focus by spectral irradiance observations during the recent deep minimum, which show opposing trends in the infrared and ultraviolet portions of the spectrum (Harder et al. 2009). On the terrestrial side, while it is clear that the Sun played only a small role in late twentieth century warming, the signature of solar cycle variations in climate are now quite well ...


Pressure Support Versus Thermal Broadening In The Lyman Alpha Forest - Ii. Effects Of The Equation Of State On Transverse Structure, MS Peeples, DH Weinberg, R Dave, MA Fardal, N Katz 2010 University of Massachusetts - Amherst

Pressure Support Versus Thermal Broadening In The Lyman Alpha Forest - Ii. Effects Of The Equation Of State On Transverse Structure, Ms Peeples, Dh Weinberg, R Dave, Ma Fardal, N Katz

Astronomy Department Faculty Publication Series

We examine the impact of gas pressure on the transverse coherence of high-redshift (2 ≤z≤ 4) Lyman α (Lyα) forest absorption along neighbouring lines of sight that probe the gas Jeans scale (projected separation Δrp≤ 500 h−1 kpc comoving, angular separation Δθ≲ 30 arcsec). We compare predictions from two smoothed particle hydrodynamics simulations that have different photoionization heating rates and thus different temperature–density relations in the intergalactic medium (IGM). We also compare spectra computed from the gas distributions to those computed from the pressureless dark matter. The coherence along neighbouring sightlines is markedly higher for the ...


Detection Of An Ultra-Bright Submillimeter Galaxy In The Subaru/Xmm-Newton Deep Field Using Aztec/Aste, S Ikarashi, K Kohno, JE Aguirre, I Aretxaga, V Arumugam, JE Austermann, JJ Bock, CM Bradford, M Cirasuolo, L Earle, H Ezawa, H Furusawa, J Furusawa, J Glenn, B Hatsukade, DH Hughes, D Iono, RJ Ivison, S Johnson, J Kamenetzky, R Kawabe, R Lupu, P Maloney, H Matsuhara, PD Mauskopf, K Motohara, EJ Murphy, K Nakajima, K Nakanishi, BJ Naylor, HT Nguyen, TA Perera, KS Scott, K Shimasaku, T Takagi, T Takata, Y Tamura, K Tanaka, T Tsukagoshi, DJ Wilner, GW Wilson, Min Yun, J Zmuidzinas 2010 University of Massachusetts - Amherst

Detection Of An Ultra-Bright Submillimeter Galaxy In The Subaru/Xmm-Newton Deep Field Using Aztec/Aste, S Ikarashi, K Kohno, Je Aguirre, I Aretxaga, V Arumugam, Je Austermann, Jj Bock, Cm Bradford, M Cirasuolo, L Earle, H Ezawa, H Furusawa, J Furusawa, J Glenn, B Hatsukade, Dh Hughes, D Iono, Rj Ivison, S Johnson, J Kamenetzky, R Kawabe, R Lupu, P Maloney, H Matsuhara, Pd Mauskopf, K Motohara, Ej Murphy, K Nakajima, K Nakanishi, Bj Naylor, Ht Nguyen, Ta Perera, Ks Scott, K Shimasaku, T Takagi, T Takata, Y Tamura, K Tanaka, T Tsukagoshi, Dj Wilner, Gw Wilson, Min Yun, J Zmuidzinas

Astronomy Department Faculty Publication Series

Abstract: We report the detection of an extremely bright ($\sim$34 mJy at 1100 $\mu$m and $\sim$73 mJy at 880 $\mu$m) submillimeter galaxy (SMG), AzTEC-ASTE-SXDF1100.001 (hereafter referred to as SXDF1100.001), discovered in 1100 $\mu$m observations of the Subaru/XMM-Newton Deep Field using AzTEC on ASTE. Subsequent CARMA 1300 $\mu$m and SMA 880 $\mu$m observations successfully pinpoint the location of SXDF1100.001 and suggest that it has two components, extended (FWHM of $\sim$4^{\prime\prime}) and compact (unresolved) ones. Z-Spec on CSO has also been used to obtain a wide band spectrum ...


Using 21 Cm Absorption In Small Impact Parameter Galaxy-Quasar Pairs To Probe Low-Redshift Damped And Sub-Damped Ly Alpha Systems, S Borthakur, TM Tripp, Min Yun, E Momjian, JD Meiring, DV Bowen, DG York 2010 University of Massachusetts - Amherst

Using 21 Cm Absorption In Small Impact Parameter Galaxy-Quasar Pairs To Probe Low-Redshift Damped And Sub-Damped Ly Alpha Systems, S Borthakur, Tm Tripp, Min Yun, E Momjian, Jd Meiring, Dv Bowen, Dg York

Astronomy Department Faculty Publication Series

To search for low-redshift damped Lyα (DLA) and sub-DLA quasar absorbers, we have conducted a 21 cm absorption survey of radio-loud quasars at small impact parameters to foreground galaxies selected from the Sloan Digital Sky Survey (SDSS). Here we present the first results from this survey based on observations of SDSS J104257.58+074850.5 (z QSO = 2.66521), a quasar at an angular separation from a foreground galaxy (z gal = 0.03321) of 25 (1.7 kpc in projection). The foreground galaxy is a low-luminosity spiral with on-going star formation (0.004 M yr–1 kpc–2) and a ...


The Calibration Of Monochromatic Far-Infrared Star Formation Rate Indicators, D Calzetti, SY Wu, S Hong, RC Kennicutt, JC Lee, DA Dale, CW Engelbracht, L van Zee, BT Draine, CN Hao, KD Gordon, J Moustakas, EJ Murphy, M Regan, A Begum, M Block, J Dalcanton, J Funes, AG de Paz, B Johnson, S Sakai, E Skillman, F Walter, D Weisz, B Williams, Y Wu 2010 University of Massachusetts Amherst

The Calibration Of Monochromatic Far-Infrared Star Formation Rate Indicators, D Calzetti, Sy Wu, S Hong, Rc Kennicutt, Jc Lee, Da Dale, Cw Engelbracht, L Van Zee, Bt Draine, Cn Hao, Kd Gordon, J Moustakas, Ej Murphy, M Regan, A Begum, M Block, J Dalcanton, J Funes, Ag De Paz, B Johnson, S Sakai, E Skillman, F Walter, D Weisz, B Williams, Y Wu

Astronomy Department Faculty Publication Series

Spitzer data at 24, 70, and 160 μm and ground-based Hα images are analyzed for a sample of 189 nearby star-forming and starburst galaxies to investigate whether reliable star formation rate (SFR) indicators can be defined using the monochromatic infrared dust emission centered at 70 and 160 μm. We compare recently published recipes for SFR measures using combinations of the 24 μm and observed Hα luminosities with those using 24 μm luminosity alone. From these comparisons, we derive a reference SFR indicator for use in our analysis. Linear correlations between SFR and the 70 μm and 160 μm luminosity are ...


Aztec Half Square Degree Survey Of The Shades Fields - I. Maps, Catalogues And Source Counts, JE Austermann, JS Dunlop, TA Perera, KS Scott, GW Wilson, I Aretxaga, DH Hughes, O Almaini, EL Chapin, SC Chapman, M Cirasuolo, DL Clements, KEK Coppin, L Dunne, S Dye, SA Eales, E Egami, D Farrah, D Ferrusca, S Flynn, D Haig, M Halpern, E Ibar, RJ Ivison, E van Kampen, Y Kang, S Kim, C Lacey, JD Lowenthal, PD Mauskopf, RJ McLure, AMJ Mortier, M Negrello, S Oliver, JA Peacock, A Pope, S Rawlings, G Rieke, I Roseboom, M Rowan-Robinson, D Scott, S Serjeant, I Smail, AM Swinbank, JA Stevens, M Velazquez, J Wagg, Min Yun 2010 University of Massachusetts - Amherst

Aztec Half Square Degree Survey Of The Shades Fields - I. Maps, Catalogues And Source Counts, Je Austermann, Js Dunlop, Ta Perera, Ks Scott, Gw Wilson, I Aretxaga, Dh Hughes, O Almaini, El Chapin, Sc Chapman, M Cirasuolo, Dl Clements, Kek Coppin, L Dunne, S Dye, Sa Eales, E Egami, D Farrah, D Ferrusca, S Flynn, D Haig, M Halpern, E Ibar, Rj Ivison, E Van Kampen, Y Kang, S Kim, C Lacey, Jd Lowenthal, Pd Mauskopf, Rj Mclure, Amj Mortier, M Negrello, S Oliver, Ja Peacock, A Pope, S Rawlings, G Rieke, I Roseboom, M Rowan-Robinson, D Scott, S Serjeant, I Smail, Am Swinbank, Ja Stevens, M Velazquez, J Wagg, Min Yun

Astronomy Department Faculty Publication Series

We present the first results from the largest deep extragalactic mm-wavelength survey undertaken to date. These results are derived from maps covering over 0.7 deg2, made at λ= 1.1 mm, using the AzTEC continuum camera mounted on the James Clerk Maxwell Telescope. The maps were made in the two fields originally targeted at λ= 850 μm with the Submillimetre Common-User Bolometer Array (SCUBA) in the SCUBA Half-Degree Extragalactic Survey (SHADES) project, namely the Lockman Hole East (mapped to a depth of 0.9–1.3 mJy rms) and the Subaru/XMM–Newton Deep Field (mapped to a ...


An Aztec 1.1-Mm Survey For Ulirgs In The Field Of The Galaxy Cluster Ms 0451.6-0305, JL Wardlow, I Smail, GW Wilson, Min Yun, KEK Coppin, R Cybulski, JE Geach, RJ Ivison, I Aretxaga, JE Austermann, AC Edge, GG Fazio, J Huang, DH Hughes, T Kodama, Y Kang, S Kim, PD Mauskopf, TA Perera, KS Scott 2010 University of Massachusetts - Amherst

An Aztec 1.1-Mm Survey For Ulirgs In The Field Of The Galaxy Cluster Ms 0451.6-0305, Jl Wardlow, I Smail, Gw Wilson, Min Yun, Kek Coppin, R Cybulski, Je Geach, Rj Ivison, I Aretxaga, Je Austermann, Ac Edge, Gg Fazio, J Huang, Dh Hughes, T Kodama, Y Kang, S Kim, Pd Mauskopf, Ta Perera, Ks Scott

Astronomy Department Faculty Publication Series

We have undertaken a deep (σ∼ 1.1 mJy) 1.1-mm survey of the z= 0.54 cluster MS 0451.6−0305 using the AzTEC camera on the James Clerk Maxwell Telescope. We detect 36 sources with signal-to-noise ratio (S/N) ≥ 3.5 in the central 0.10 deg2 and present the AzTEC map, catalogue and number counts. We identify counterparts to 18 sources (50 per cent) using radio, mid-infrared, Spitzer InfraRed Array Camera (IRAC) and Submillimetre Array data. Optical, near- and mid-infrared spectral energy distributions are compiled for the 14 of these galaxies with detectable counterparts, which are ...


Deep 1.1 Mm-Wavelength Imaging Of The Goods-S Field By Aztec/Aste - I. Source Catalogue And Number Counts, KS Scott, Min Yun, GW Wilson, JE Austermann, E Aguilar, I Aretxaga, H Ezawa, D Ferrusca, B Hatsukade, DH Hughes, D Iono, M Giavalisco, R Kawabe, K Kohno, PD Mauskopf, T Oshima, TA Perera, J Rand, Y Tamura, T Tosaki, M Velazquez, CC Williams, M Zeballos 2010 University of Massachusetts - Amherst

Deep 1.1 Mm-Wavelength Imaging Of The Goods-S Field By Aztec/Aste - I. Source Catalogue And Number Counts, Ks Scott, Min Yun, Gw Wilson, Je Austermann, E Aguilar, I Aretxaga, H Ezawa, D Ferrusca, B Hatsukade, Dh Hughes, D Iono, M Giavalisco, R Kawabe, K Kohno, Pd Mauskopf, T Oshima, Ta Perera, J Rand, Y Tamura, T Tosaki, M Velazquez, Cc Williams, M Zeballos

Astronomy Department Faculty Publication Series

We present the first results from a confusion-limited map of the Great Observatories Origins Deep Survey-South (GOODS-S) taken with the AzTEC camera on the Atacama Submillimeter Telescope Experiment. We imaged a field to a 1σ depth of 0.48–0.73 mJy beam−1, making this one of the deepest blank-field surveys at mm-wavelengths ever achieved. Although by traditional standards our GOODS-S map is extremely confused due to a sea of faint underlying sources, we demonstrate through simulations that our source identification and number counts analyses are robust, and the techniques discussed in this paper are relevant for other deeply ...


Feedback And Recycled Wind Accretion: Assembling The Z = 0 Galaxy Mass Function, BD Oppenheimer, R Dave, D Keres, M Fardal, N Katz, JA Kollmeier, D Weinberg 2010 University of Massachusetts - Amherst

Feedback And Recycled Wind Accretion: Assembling The Z = 0 Galaxy Mass Function, Bd Oppenheimer, R Dave, D Keres, M Fardal, N Katz, Ja Kollmeier, D Weinberg

Astronomy Department Faculty Publication Series

We analyse cosmological hydrodynamic simulations that include observationally-constrained prescriptions for galactic outflows. If these simulated winds accurately represent winds in the real Universe, then material previously ejected in winds provides the dominant source of gas infall for new star formation at redshifts z<1. This recycled wind accretion, or wind mode, provides a third physically distinct accretion channel in addition to the "hot" and "cold" modes emphasised in recent theoretical studies. Because of the interaction between outflows and gas in and around halos, the recycling timescale of wind material (t_rec) is shorter in higher-mass systems, which reside in denser gaseous environments. In these simulations, this differential recycling plays a central role in shaping the present-day galaxy stellar mass function (GSMF). If we remove all particles that were ever ejected in a wind, then the predicted GSMFs are much steeper than observed; galaxy masses are suppressed both by the direct removal of gas and by the hydrodynamic heating of their surroundings, which reduces subsequent infall. With wind recycling included, the simulation that incorporates our favoured momentum-driven wind scalings reproduces the observed GSMF for stellar masses 10^9 < M < 5x10^10 Msolar. At higher masses, wind recycling leads to excessive galaxy masses and excessive star formation rates relative to observations. In these massive systems, some quenching mechanism must suppress the re-accretion of gas ejected from star-forming galaxies. In short, as has long been anticipated, the form of the GSMF is governed by outflows; the unexpected twist here for our simulated winds is that it is not primarily the ejection of material but how the ejected material is re-accreted that governs the GSMF.


The Relation Between Gas And Dust In The Taurus Molecular Cloud, G Pineda, P Goldsmith, N Chapman, Ronald L. Snell, D Li, L Cambresy, C Brunt 2010 University of Massachusetts - Amherst

The Relation Between Gas And Dust In The Taurus Molecular Cloud, G Pineda, P Goldsmith, N Chapman, Ronald L. Snell, D Li, L Cambresy, C Brunt

Astronomy Department Faculty Publication Series

We report a study of the relation between dust and gas over a 100 deg2 area in the Taurus molecular cloud. We compare the H2 column density derived from dust extinction with the CO column density derived from the 12CO and 13CO J = 1 → 0 lines. We derive the visual extinction from reddening determined from 2MASS data. The comparison is done at an angular size of 200'' corresponding to 0.14 pc at a distance of 140 pc. We find that the relation between visual extinction A V and N(CO) is linear between A V ...


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