Star Formation in Distant Red Galaxies: Spitzer observations in the Hubble Deep Field South

Details Star Formation in Distant Red Galaxies: Spitzer observations in the Hubble Deep Field South Star Formation in Distant Red Galaxies: Spitzer observations in the Hubble Deep Field South

2005-11-20

arxiv.org/abs/astro-ph/0511598v1

Astrophys.J.636:L17-L20,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, accepted for publication in ApJL

Scientific paper

10.1086/499805

We present Spitzer 24micron imaging of 1.5 < z < 2.5 Distant Red Galaxies (DRGs) in the 10arcmin by 10arcmin Extended Hubble Deep Field South of the Multiwavelength Survey by Yale-Chile. We detect 65% of the DRGs with K_AB < 23.2 mag at S_24micron > 40uJy, and conclude that the bulk of the DRG population are dusty active galaxies. A mid-infrared (MIR) color analysis with IRAC data suggests that the MIR fluxes are not dominated by buried AGN, and we interpret the high detection rate as evidence for a high average star formation rate of = 130+/-30 M/yr. From this, we infer that DRGs are important contributors to the cosmic star formation rate density at z ~ 2, at a level of \~0.02 M/yr/Mpc^3 to our completeness limit of K_AB = 22.9 mag

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