Spitzer Observations of Massive Red Galaxies at High Redshift

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dc.creatorPapovich, Casey
dc.creatorMoustakas, L. A.
dc.creatorDickinson, M.
dc.creatorFloc'h, E. Le
dc.creatorRieke, G. H.
dc.creatorDaddi, E.
dc.creatorAlexander, D. M.
dc.creatorBauer, F.
dc.creatorBrandt, W. N.
dc.creatorDahlen, T.
dc.creatorEgami, E.
dc.creatorEisenhardt, P.
dc.creatorElbaz, D.
dc.creatorFerguson, H. C.
dc.creatorGiavalisco, M.
dc.creatorLucas, R. A.
dc.creatorMobasher, B.
dc.creatorPerez-Gonzalez, P. G.
dc.creatorStutz, A.
dc.creatorRieke, M. J.
dc.creatorYan, H.
dc.date2005-11-09
dc.date.accessioned2026-07-07T10:43:23Z
dc.date.available2026-07-07T10:43:23Z
dc.descriptionWe investigate the properties of massive galaxies at z=1-3.5 using HST observations, ground-based near-IR imaging, and Spitzer Space Telescope observations at 3-24 micron. We identify 153 distant red galaxies (DRGs) with J-K > 2.3 mag (Vega) in the southern GOODS field. This sample is approximately complete in stellar mass for passively evolving galaxies above 10^11 solar masses and z < 3. The galaxies identified by this selection are roughly split between objects whose optical and near-IR rest-frame light is dominated by evolved stars combined with ongoing star formation, and galaxies whose light is dominated by heavily reddened starbursts. Very few of the galaxies (< 10%) have no indication of current star formation. Using SFR estimates that include the reradiated IR emission, the DRGs at z=1.5-3 with stellar masses > 10^11 solar masses have specific SFRs (SFRs per unit stellar mass) ranging from 0.2 to 10 Gyr^-1, with a mean value of ~2.4 Gyr^-1. The DRGs with stellar masses > 10^11 solar masses and 1.5 < z < 3 have integrated specific SFRs greater the global value over all galaxies. In contrast, we find that galaxies at z = 0.3-0.75 with these stellar masses have integrated specific SFRs less than the global value, and more than an order of magnitude lower than that for massive DRGs at z = 1.5-3. At z < 1, lower-mass galaxies dominate the overall cosmic mass assembly. This suggests that the bulk of star formation in massive galaxies occurs at early cosmic epochs and is largely complete by z~1.5. [Abridged]
dc.descriptionAccepted for publication in the Astrophysical Journal. 25 pages, 14 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0511289
dc.identifierhttp://arxiv.org/abs/astro-ph/0511289
dc.identifierAstrophys.J.640:92-113,2006
dc.identifierdoi:10.1086/499915
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182226
dc.subjectAstrophysics
dc.titleSpitzer Observations of Massive Red Galaxies at High Redshift
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