Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 7 of 7
Full-Text Articles in Astrophysics and Astronomy
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, Hj Mccracken, C Mancini, P Capak, M Carollo, A Cimatti, M Giavalisco, O Ilbert, X Kong, S Lilly, K Motohara, K Ohta, Db Sanders, N Scoville, N Tamura, Y Taniguchi
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, Hj Mccracken, C Mancini, P Capak, M Carollo, A Cimatti, M Giavalisco, O Ilbert, X Kong, S Lilly, K Motohara, K Ohta, Db Sanders, N Scoville, N Tamura, Y Taniguchi
Astronomy Department Faculty Publication Series
We present observations of a very massive galaxy at z = 1.82 that show that its morphology, size, velocity dispersion, and stellar population properties 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 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 σ⋆ < 326 km s−1. By detailed stellar population modeling of both the galaxy broadband spectral energy distribution and the rest-frame optical spectrum, we derive a star formation-weighted age and formation redshift of tsf ≃ 1–2 Gyr and z …
The Nature Of Submillimetre Galaxies In Cosmological Hydrodynamic Simulations, R Dave, K Finlator, Bd Oppenheimer, M Fardal, N Katz, D Keres, Dh Weinberg
The Nature Of Submillimetre Galaxies In Cosmological Hydrodynamic Simulations, R Dave, K Finlator, Bd Oppenheimer, M Fardal, N Katz, D Keres, Dh Weinberg
Astronomy Department Faculty Publication Series
We study the nature of rapidly star-forming galaxies at z= 2 in cosmological hydrodynamic simulations, and compare their properties to observations of submillimetre galaxies (SMGs). We identify simulated SMGs as the most rapidly star-forming systems that match the observed number density of SMGs. In our models, SMGs are massive galaxies sitting at the centres of large potential wells, being fed by smooth infall and gas-rich satellites at rates comparable to their star formation rates (SFRs). They are not typically undergoing major mergers that significantly boost their quiescent SFR, but they still often show complex gas morphologies and kinematics. Our …
Mid-Infrared Spectroscopy Of Candidate Active Galactic Nuclei-Dominated Submillimeter Galaxies, K Coppin, A Pope, K Menendez-Delmestre, Dm Alexander, Js Dunlop, E Egami, J Gabor, E Ibar, Rj Ivison, Je Austermann, Aw Blain, Sc Chapman, Dl Clements, L Dunne, S Dye, D Farrah, Dh Hughes, Amj Mortier, Mj Page, M Rowan-Robinson, D Scott, C Simpson, I Smail, Am Swinbank, M Vaccari, Min Yun
Mid-Infrared Spectroscopy Of Candidate Active Galactic Nuclei-Dominated Submillimeter Galaxies, K Coppin, A Pope, K Menendez-Delmestre, Dm Alexander, Js Dunlop, E Egami, J Gabor, E Ibar, Rj Ivison, Je Austermann, Aw Blain, Sc Chapman, Dl Clements, L Dunne, S Dye, D Farrah, Dh Hughes, Amj Mortier, Mj Page, M Rowan-Robinson, D Scott, C Simpson, I Smail, Am Swinbank, M Vaccari, Min Yun
Astronomy Department Faculty Publication Series
Spitzer spectroscopy has revealed that 80% of submm galaxies (SMGs) are starburst (SB)-dominated in the mid-infrared. Here we focus on the remaining 20% that show signs of harboring powerful active galactic nuclei (AGNs). We have obtained Spitzer-InfraRed Spectrograph spectroscopy of a sample of eight SMGs that are candidates for harboring powerful AGNs on the basis of IRAC color selection (S 8 μm/S 4.5 μm>2, i.e., likely power-law mid-infrared spectral energy distributions). SMGs with an AGN dominating (50%) their mid-infrared emission could represent the "missing link" sources in an evolutionary sequence involving a major merger. First …
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
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 confused surveys. …
Evidence Of A Fast Evolution Of The Uv Luminosity Function Beyond Redshift 6 From A Deep Hawk-I Survey Of The Goods-S Field, M Castellano, A Fontana, K Boutsia, A Grazian, L Pentericci, R Bouwens, M Dickinson, M Giavalisco, P Santini, S Cristiani, Et. Al.
Evidence Of A Fast Evolution Of The Uv Luminosity Function Beyond Redshift 6 From A Deep Hawk-I Survey Of The Goods-S Field, M Castellano, A Fontana, K Boutsia, A Grazian, L Pentericci, R Bouwens, M Dickinson, M Giavalisco, P Santini, S Cristiani, Et. Al.
Astronomy Department Faculty Publication Series
No abstract provided.
The Unusual N Iv]-Emitter Galaxy Gds J033218.92-275302.7: Star Formation Or Agn-Driven Winds From A Massive Galaxy At Z=5.56, E Vanzella, A Grazian, M Hayes, L Pentericci, D Schaerer, M Dickinson, S Cristiani, M Giavalisco, A Verhamme, M Nonino, P Rosati
The Unusual N Iv]-Emitter Galaxy Gds J033218.92-275302.7: Star Formation Or Agn-Driven Winds From A Massive Galaxy At Z=5.56, E Vanzella, A Grazian, M Hayes, L Pentericci, D Schaerer, M Dickinson, S Cristiani, M Giavalisco, A Verhamme, M Nonino, P Rosati
Astronomy Department Faculty Publication Series
Aims. We investigate the nature of the source GDS J033218.92-275302.7 at redshift 5.56.
Methods. The spectral energy distribution of the source is well-sampled by 16 bands photometry from UV-optical (HST and VLT), near infrared, near infrared (VLT) to mid-infrared (Spitzer). The detection of a signal in the mid-infrared Spitzer/IRAC bands 5.8, 8.0 - where the nebular emission contribution is less effective - suggests that there is a Balmer break, the signature of an underlying stellar population formed at earlier epochs. The high-quality VLT/FORS2 spectrum shows a clear Ly emission line, together with semi-forbidden N IV] 1483.3-1486.5 also …
Aztec Half Square Degree Survey Of The Shades Fields - I. Maps, Catalogues And Source Counts, Je Austermann, Min Yun, Et. Al.
Aztec Half Square Degree Survey Of The Shades Fields - I. Maps, Catalogues And Source Counts, Je Austermann, Min Yun, Et. Al.
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 depth of 1.0–1.7 mJy rms). …