HST/WFPC2 Morphologies of K-selected Extremely Red Galaxies

Abstract

We selected 115 extremely red objects (EROs) from deep HST WFPC2 archive data combined with ground-based K-band images, with (F814W - Ks) >= 4mag, K-band SNR >= 5, and a median limiting Ks magnitude of 18.7mag, over a corresponding area of 228 sq. arcminutes, for a morphological study of the ERO galaxy population. The survey covered a total of 409 sq. arcminutes over 77 separate WFPC2 fields. This is the first complete sample of bright EROs with high resolution HST morphologies. From a visual morphological classification, we find that 30+/-5% of our EROs have morphologies consistent with a pure bulge or bulge-dominated galaxy (equivalent to E/S0), while disks comprise 64+/-$7% of the sample. Only 6% of the EROs remained unclassifiable. Mergers or strongly interacting systems, which includes sources from both classes, make up 17+/-4% of the full sample. The quantitative MDS profile fitting is consistent with these results. These results highlight the complex nature of optical/near-IR color selected EROs. The dominant component of our sample is comprised of disks, not spheroids or strongly interacting systems like HR10. Using Bruzual & Charlot SED models, we investigated population differences in EROs selected by their (I-K) vs. (R-K) colors and found that I-band based surveys preferentially select systems with prolonged star formation. Real differences in the surface densities of EROs in R-band and I-band based surveys may reflect this color selection effect, complicating the comparisons between and interpretations on the nature of the ERO population. <Abstract truncated>

20 Pages, 10 figures LaTeX/AASTeX. ApJ accepted. High-res versions of figs 1,3,4,5 at: http://irastro.caltech.edu/~djt/p60ir_figs.tar.gz

References in corpus (30)

• Evolution since z = 0.5 of the Morphology-Density relation for Clusters of Galaxies
• SCUBA: A common-user submillimetre camera operating on the James Clerk Maxwell Telescope
• The K-Band Galaxy Luminosity Function
• Morphological studies of the galaxy populations in distant "Butcher-Oemler" clusters with HST. II. AC103, AC118 and AC114 at z=0.31
• The K20 survey. I. Disentangling old and dusty star-forming galaxies in the ERO population
• Optical Spectral Signatures of Dusty Starburst Galaxies
• The Discovery of ERO Counterparts to Faint Submm Galaxies
• The evolution of field early-type galaxies to z~0.7
• The Faint Sub-mm Galaxy Population: HST Morphologies and Colors
• Observations of a z=1.44 Dusty, Ultraluminous Galaxy and Implications for Deep Sub-mm Surveys
• A Faint Star-Forming System Viewed Through the Lensing Cluster Abell 2218: First Light at z~5.6?
• Extremely red galaxies: age and dust degeneracy solved ?
• Constraints on the Early Formation of Field Elliptical Galaxies
• The Las Campanas IR Survey: Early Type Galaxy Progenitors Beyond Redshift One
• Vigorous star formation hidden by dust in a galaxy at $z=1.4$
• The Spectroscopic Redshift of an Extremely Red Object and the Nature of the Very Red Galaxy Population
• The Surface Density of Extremely Red Objects
• A Study of Nine High-Redshift Clusters of Galaxies : III. HST Morphology of Clusters 0023+0423 and 1604+4304
• A Hubble Space Telescope Lensing Survey of X-ray Luminous Galaxy Clusters: II. A Search for Gravitationally Lensed EROs
• The Apparent Morphology of Peculiar Galaxies at Intermediate to High Redshifts
• Discovery of a z=2.76 Dusty Radio Galaxy?
• Near Infrared Observations of the Extremely Red Object CL0939+4713B: An Old Galaxy at z~1.58?
• The relative abundances of ellipticals and starbursts among the Extremely Red Galaxies
• 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
• A Hubble Space Telescope Lensing Survey of X-ray Luminous Galaxy Clusters: III. A Multiply-imaged Extremely Red Galaxy at z=1.6
• A Massive Disk Galaxy at z=1.34
• 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
• Radio galaxy selected clusters at high redshift and associated ERO overdensities

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• Red-sequence galaxies with young stars and dust: The cluster Abell 901/902 seen with COMBO-17
• Morphologies and Spectral Energy Distributions of Extremely Red Galaxies in the GOODS-South Field
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• EROs found behind lensing clusters: II.Empirical properties, classification, and SED modelling based on multi-wavelength observations
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