The Surface Density of Extremely Red Objects

Abstract

We present initial results from a field survey for extremely red objects (EROs, defined here as (R-K') >= 6 mag) covering 154 square arcminutes of sky, from the first of 7 deep, wide-field K' images obtained as part of the Calar Alto Deep Imaging Survey (CADIS). The 5-sigma point source detection limits are K'=20.5 and R=25.0, while extended-source limits are up to 0.5-0.75 mag brighter. We identify a total of 8 bright EROs with K' =< 19.0. Six of these bright EROs are resolved and are likely to be galaxies, while the remaining 2 are unresolved, with colors consistent with their being low-mass galactic stars. We derive a surface density for the 6 bright, extragalactic EROs of 0.039 +/- 0.016 per sq. arcmin, higher by a factor of 4 than previous values. We estimate that the volume density of bright EROs to be as high as that of nearby Seyfert galaxies.

19 pages, including 5 figures and 2 tables. To appear in ApJ

Cited by in corpus (80)

• A new photometric technique for the joint selection of star-forming and passive galaxies at 1.4<z<2.5
• The COMBO-17 Survey: Evolution of the Galaxy Luminosity Function from 25,000 Galaxies with 0.2<z<1.2
• The K20 survey. I. Disentangling old and dusty star-forming galaxies in the ERO population
• The Evolution of Galaxy Number Density at z < 8 and its Implications
• A Substantial Population of Red Galaxies at z > 2: Modeling of the Spectral Energy Distributions of an Extended Sample
• A wide area survey for high-redshift massive galaxies. I. Number counts and clustering of BzKs and EROs
• Keck Deep Fields. II. The UV Galaxy Luminosity Function at z~4, 3, and 2
• High-Redshift Extremely Red Objects in the HST Ultra Deep Field Revealed by the GOODS IRAC Observations
• An excess of submm sources near 4C41.17: a candidate proto-cluster at z=3.8?
• The Las Campanas IR Survey: Early Type Galaxy Progenitors Beyond Redshift One
• The Unusual Infrared Object HDF-N J123656.3+621322
• The Las Campanas IR Survey. II. Photometric redshifts, comparison with models and clustering evolution
• The Diversity of Extremely Red Objects
• A Pair of Compact Red Galaxies at Redshift 2.38, Immersed in a 100 kpc Scale Ly-alpha Nebula
• Color and Stellar Population Gradients in Passively Evolving Galaxies at z~2 from HST/WFC3 Deep Imaging in the Hubble Ultra Deep Field
• XMM-Newton observations of Extremely Red Objects and the link with luminous, X-ray obscured Quasars
• The Hubble Space Telescope GOODS NICMOS Survey: Overview and the Evolution of Massive Galaxies at 1.5 < z < 3
• Caltech Faint Galaxy Redshift Survey XVI: The Luminosity Function for Galaxies in the Region of the HDF-North to z = 1.5
• The Munich Near-Infrared Cluster Survey - I. Field selection, object extraction, and photometry
• The Masses, Ancestors and Descendents of Extremely Red Objects: Constraints from Spatial Clustering
• An X-ray Search for Compact Central Sources in Supernova Remnants I: SNRs G093.3+6.9, G315.4-2.3, G084.2+0.8, & G127.1+0.5
• IRAC Imaging of Lockman Hole
• The Multiwavelength Survey by Yale-Chile (MUSYC): Wide K-band Imaging, Photometric Catalogs, Clustering and Physical Properties of Galaxies at z~2
• A Hubble Space Telescope Lensing Survey of X-ray Luminous Galaxy Clusters: II. A Search for Gravitationally Lensed EROs
• The Calar Alto Deep Imaging Survey: K-band Galaxy Number Counts
• The Number Density of Old Passively-Evolving Galaxies at z=1 in the Subaru/XMM-Newton Deep Survey Field
• HST/WFPC2 Morphologies of K-selected Extremely Red Galaxies
• Red galaxy overdensities and the varied cluster environments of powerful radio sources with z~1.6
• Active and passive galaxies at z~2: Rest-frame optical morphologies with WFC3
• The Las Campanas Infrared Survey. III. The H-band Imaging Survey and the Near-Infrared and Optical Photometric Catalogs
• The Identification of the Submillimeter Galaxy SMM J00266+1708
• Four IRAC Sources with an Extremely Red H-[3.6] Color: Passive or Dusty Galaxies at z>4.5?
• Extremely red galaxy counterparts to 7C radio sources
• Infrared Properties of Radio-Selected Submillimeter Galaxies in the Spitzer First Look Survey Verification Field
• Redshifts of the Gravitational Lenses MG1131+0456 and B1938+666
• Rest-frame UV--Optically Selected Galaxies at 2.3<z<3.5: Searching for Dusty Star-forming and Passively-Evolving Galaxies
• A wide field survey at the Northern Ecliptic Pole: II. Number counts and galaxy colours in B_j, R, and K
• Near Infrared Observations of the Extremely Red Object CL0939+4713B: An Old Galaxy at z~1.58?
• Hyper Extremely Red Objects in the Subaru Deep Field: Evidence for Primordial Elliptical Galaxies in the Dusty Starburst Phase
• A Deep Multicolor Survey. VI. Near-Infrared Observations, Selection Effects, and Number Counts
• The z=2.51 Extremely Red Submillimeter Galaxy SMMJ04431+0210
• Evolution of Elliptical Galaxies at z >~ 1 Revealed from a Large, Multicolor Sample of Extremely Red Objects
• Extremely Red Objects in the Field of QSO 1213-0017: A Galaxy Concentration at z=1.31
• Discovery of an extremely red galaxy at z=0.65 with dusty star-formation and nuclear activity
• Star Formation and AGN activity in Galaxies classified using the 1.6 μm Bump and PAH features at $z=0.4-2$
• High-z massive galaxies in the HDF-South
• Massive z ~ 1.3 evolved galaxies revealed
• Obscured AGN from the ELAIS Deep X-ray Survey
• Overdensities of Extremely Red Objects in the Fields of High-Redshift Radio-Loud Quasars
• Very Red and Extremely Red Galaxies in the Fields of z ~ 1.5 Radio-Loud Quasars
• X-ray properties of BzK-selected galaxies in the deepest X-ray fields
• Classification of Extremely Red Objects in the COSMOS Field
• Possible identification of massive and evolved galaxies At z > 5
• Massive, red galaxies in a hierarchical universe I. Counts of Extremely Red Objects and basic properties
• The density of extremely red objects around high-z radio-loud AGN
• Search for sub-mm, mm and radio continuum emission from Extremely Red Objects
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) -- V. Submillimetre properties of near-infrared--selected galaxies in the Subaru/XMM--Newton deep field
• Radio galaxy selected clusters at high redshift and associated ERO overdensities
• Dusty ERO Search behind Two Massive Clusters
• A Deep Multicolor Survey. VII. Extremely Red Objects and Galaxy Formation
• The Mass-Dependent Clustering History of K-selected Galaxies at z < 4 in the SXDS/UDS Field
• The numbers of z~2 star-forming and passive galaxies in 2.5 square degrees of deep CFHT imaging
• Formation and evolution of dusty starburst galaxies I. A new method for deriving spectral energy distribution
• Tunable-filter imaging of quasar fields at z~1. I. A cluster around MRC B0450-221
• Keck Deep Fields. IV. Luminosity Dependent Clustering and Galaxy Downsizing in UV-Selected Galaxies at z=4, 3, and 2
• Photometric Redshifts and Morphologies of Galaxies in the NICMOS Parallel Fields
• A multi-wavelength approach to the properties of Extremely Red Galaxy populations: I - Contribution to the Star Formation Rate density and AGN content
• Properties of Extremely Red Objects in an Overdense Region
• Dust-obscured star formation and the contribution of galaxies escaping UV/optical color selections at z~2
• On the colour-colour properties of the Extremely Red Objects
• B3 0003+387: AGN Marked Large-Scale Structure at z=1.47?
• VEXAS: VISTA EXtension to Auxiliary Surveys -- Data Release 2: Machine-learning based classification of sources in the Southern Hemisphere
• Angular clustering of z~2 star-forming and passive galaxies in 2.5 square degrees of deep CFHT imaging
• Three-micron imaging of the Hubble Deep Field
• LBQS 1429-0053: a binary quasar rather than a lensed quasar
• VEXAS: the VISTA EXtension to Auxiliary Surveys -- Data Release 1: the Southern Galactic Hemisphere
• A Color Analysis of the NICMOS Parallel Image Archive
• A search for planetary-mass objects and brown dwarfs in the Upper Scorpius association
• Three Emission-Line Galaxies at z~2.4
• Clustering around radio galaxies at z~1.5