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Title:
ERO R1 in the Field of CL 0939+4713: Evidence for an S0-like Galaxy at z ~ 1.5
Authors:
Iye, Masanori; Shimasaku, Kazuhiro; Miyazaki, Satoshi; Simpson, Chris; Imanishi, Masatoshi; Kashikawa, Nobunari; Kodama, Tadayuki; Chiba, Masashi; Saito, Yoshihiko; Goto, Miwa; Iwamuro, Fumihide; Kobayashi, Naoto; Okamura, Sadanori; Terada, Hiroshi
Affiliation:
AA(Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan; .; Department of Astronomy, School of Science, Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan.), AB(Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.), AC(Subaru Telescope, National Astronomical Observatory, 650 North A`Ohoku Place, Hilo, HI 96720.), AD(Subaru Telescope, National Astronomical Observatory, 650 North A`Ohoku Place, Hilo, HI 96720.), AE(Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan; .), AF(Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan; .; Department of Astronomy, School of Science, Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan.), AG(Theoretical Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan.), AH(Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan; .; Department of Astronomy, School of Science, Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan.), AI(Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan; .), AJ(Institute for Astronomy, University of Hawaii, North A`Ohoku Place, Hilo, HI 96720.), AK(Department of Astronomy, Kyoto University, Kita-shirakawa, Kyoto 606-8502, Japan.), AL(Subaru Telescope, National Astronomical Observatory, 650 North A`Ohoku Place, Hilo, HI 96720.), AM(Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.), AN(Subaru Telescope, National Astronomical Observatory, 650 North A`Ohoku Place, Hilo, HI 96720.)
Publication:
The Astrophysical Journal, Volume 590, Issue 2, pp. 770-777. (ApJ Homepage)
Publication Date:
06/2003
Origin:
UCP
ApJ Keywords:
Galaxies: Clusters: Individual: Alphanumeric: A851, Galaxies: Elliptical and Lenticular, cD, Galaxies: Evolution, Galaxies: High-Redshift
DOI:
10.1086/375146
Bibliographic Code:
2003ApJ...590..770I

Abstract

We present further observations of the extremely red object ERO J094258+4659.2, identified earlier by Iye et al. as ERO R1 in their deep images of the cluster A851. We estimate its redshift independently by eight-band photometric redshift determination and cross-correlation of a new H-band spectrum with the optical spectra of local E/S0 galaxies and conclude that it lies at z~1.5. Although its colors are consistent with both an elliptical galaxy and an S0 galaxy at that redshift, its elongated shape and exponential luminosity profile suggest the presence of an evolved stellar disk component. We rule out the possibility that these properties are strongly influenced by gravitational lensing by the foreground cluster and therefore conclude that this object is more likely to be an S0-like galaxy rather than a lensed elliptical. The H-band spectrum does not show strong Hα emission, and the star formation rate therefore appears to be very modest. The presence of such a galaxy with an apparently relaxed disk of stars at this high redshift provides a new and strong constraint on theoretical models that aim to explain the formation and evolution of galaxies.

On the basis of data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan and, in part, on observations with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555.

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