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Title:
Morphologies in a Cluster of Extremely Red Galaxies with Old Stellar Populations at z = 1.34
Authors:
Fu, Hai; Stockton, Alan; Liu, Michael
Affiliation:
AA(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822), AB(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822), AC(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822)
Publication:
The Astrophysical Journal, Volume 632, Issue 2, pp. 831-840. (ApJ Homepage)
Publication Date:
10/2005
Origin:
UCP
ApJ Keywords:
galaxies: clusters: individual (IDSCL J0749+1018), Galaxies: Evolution, Galaxies: Formation, Galaxies: High-Redshift
DOI:
10.1086/444374
Bibliographic Code:
2005ApJ...632..831F

Abstract

We have identified a clustering of red galaxies from deep optical/IR images obtained as part of the Institute for Astronomy Deep Survey. Photometric spectral energy distributions indicate that most of these galaxies comprise nearly pure old stellar populations at a redshift near 1.4, and Keck spectroscopy of the three brightest red galaxies confirms this interpretation and gives redshifts ranging from 1.335 to 1.338. Four of the galaxies are close together on the sky and less than 30" from an R=13.5 star; we have obtained deep adaptive optics imaging of this group. Detailed analysis and modeling of the surface brightness profiles of these galaxies shows that two are normal elliptical galaxies, one is an S0, and one appears to be an essentially pure disk of old stars, with no significant bulge. All four are highly relaxed, symmetric systems. While the old, bulgeless disk galaxy represents a type that is rare at the present epoch, the other three galaxies have structural parameters that are essentially indistinguishable from those of present-day galaxies and differ only in the age of their stellar populations.

Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the financial support of the W. M. Keck Foundation.

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