The Submillimeter Properties of Extremely Red Objects

Abstract

We use deep near-infrared and submillimeter observations of three massive lensing cluster fields, A370, A851, and A2390, to determine the average submillimeter properties of a K'-selected sample. The 38 Extremely Red Objects (EROs; I-K'>4) with K'<21.25 have a very significant error-weighted mean 850-micron flux of 1.58 +/- 0.13 mJy. The ERO contribution to the 850-micron background is 1.88 +/- 0.16 x 10^4 mJy per square degree, or about half the background light. The 17 Very Red Objects (VROs; 3.5<I-K'<4) are also significantly detected (1.32 +/- 0.19 mJy), bringing the combined VRO and ERO contribution to 2.59 +/- 0.19 x 10^4 mJy per square degree. There is a substantial systematic uncertainty (about a factor of two) in this value due to field-to-field variation, but even with this uncertainty it is clear that a large fraction of the 850-micron background arises from red objects. An analysis of the VRO and ERO number counts shows that half of the population's 850-micron light arises in objects with demagnified magnitudes K'<20 and half in fainter objects. On the basis of the I-J versus J-K' colors of the galaxies, the bulk of the submillimeter signal appears to arise from the dusty starburst galaxies in the red object population rather than from the high-redshift elliptical galaxies.

5 pages, accepted by The Astrophysical Journal Letters

References in corpus (6)

• The nature of faint submm-selected galaxies
• The K20 survey. I. Disentangling old and dusty star-forming galaxies in the ERO population
• Faint Submillimeter Counts from Deep 850 Micron Observations of the Lensing Clusters A370, A851, and A2390
• A Hubble Space Telescope Lensing Survey of X-ray Luminous Galaxy Clusters: II. A Search for Gravitationally Lensed EROs
• The Submillimeter Properties of the 1 Ms Chandra Deep Field North X-ray Sample
• Near-infrared Spectroscopy and HST Imaging of a Dusty Starburst ERO

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• Near-Infrared Colors of Submillimeter-Selected Galaxies
• The Canada-UK Deep Submillimeter Survey VII: Optical and near-infrared identifications for the 14h field
• The nature of a gravitationally lensed sub-millimetre arc in MS0451.6-0305: two interacting galaxies at z~2.9?
• Submillimeter observations of Distant Red Galaxies: uncovering the 1mJy 850um-population
• The z=2.51 Extremely Red Submillimeter Galaxy SMMJ04431+0210
• MIPS J142824.0+352619: A Hyperluminous Starburst Galaxy at z=1.325
• A deeper view of Extremely Red Galaxies: the redshift distribution in the GOODS/CDFS ISAAC field
• Submillimetre Detection of the z=2.83 Lyman-Break Galaxy, Westphal-MM8, and Implications for SCUBA2
• The Subillimeter Properties of Extremely Red Objects in the CUDSS Fields
• Dusty ERO Search behind Two Massive Clusters
• Number Density Evolution of Ks -band Selected High Redshift Galaxy Populations in the AKARI North Ecliptic Pole Field
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