Submillimeter observations of Distant Red Galaxies: uncovering the 1mJy 850um-population

Details Submillimeter observations of Distant Red Galaxies: uncovering the 1mJy 850um-population Submillimeter observations of Distant Red Galaxies: uncovering the 1mJy 850um-population

2005-09-05

arxiv.org/abs/astro-ph/0509104v1

Astrophys.J.632:L9-L12,2005

Astronomy and Astrophysics

Astrophysics

4 pages, including 1 figure; accepted by ApJ Letters

Scientific paper

10.1086/497636

We present a study of the submillimeter (submm) emission of Distant Red Galaxies (DRGs). The DRGs are selected by the criterion (J-K)>2.3, and are generally massive galaxies at redshifts higher than 2, with red rest-frame optical colors. Using a deep SCUBA submm image of a field centred on the cluster MS1054-03, we obtain a statistical detection of the DRGs at redshift z=2-3.5, with an average 850um flux density of 1.11+-0.28mJy. The detection implies an average star formation rate (SFR) of 127+-34 M_sun/yr (lensing corrected), assuming that the far-infrared (FIR) spectral energy distribution (SED) is well-described by a modified blackbody. The SFR derived from the submm agrees well with SFRs derived from SED fitting of optical-near-infrared data and average X-ray emission. Constant Star Formation models imply ages of 2Gyr, extinction A_V=2.4 mag, which is consistent with the FIR to rest-frame optical luminosity ratio of ~15. DRGs are older and have lower SFRs relative to optical luminosity than (ultra-)luminous infrared galaxies, although their FIR luminosities are similar. The DRGs at 24) at 1

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