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Title:
Serendipitously Detected Galaxies in the Hubble Deep Field
Authors:
Dawson, Steve; Stern, Daniel; Bunker, Andrew J.; Spinrad, Hyron; Dey, Arjun
Affiliation:
AA(; Department of Astronomy, University of California, Berkeley, Berkeley, CA 94720; , .), AB(; Formerly of the Department of Astronomy, University of California, Berkeley, Berkeley, CA 94720.; Jet Propulsion Laboratory, Mail Stop 169-327, California Institute of Technology, Pasadena, CA 91109; .), AC(; Formerly of the Department of Astronomy, University of California, Berkeley, Berkeley, CA 94720.; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK, .), AD(; Department of Astronomy, University of California, Berkeley, Berkeley, CA 94720; , .), AE(; Kitt Peak National Observatory, National Optical Astronomy Observatory, 950 North Cherry Avenue, P. O. Box 26732, Tucson, AZ 85726; .)
Publication:
The Astronomical Journal, Volume 122, Issue 2, pp. 598-610. (AJ Homepage)
Publication Date:
08/2001
Origin:
UCP
AJ Keywords:
Cosmology: Observations, Cosmology: Early Universe, Galaxies: Distances and Redshifts, Galaxies: High-Redshift
DOI:
10.1086/321160
Bibliographic Code:
2001AJ....122..598D

Abstract

We present a catalog of 74 galaxies detected serendipitously during a campaign of spectroscopic observations of the Hubble Deep Field North (HDF) and its environs. Among the identified objects are five candidate Lyα emitters at z>~5, a galaxy cluster at z=0.85, and a Chandra source with a heretofore undetermined redshift of z=2.011. We report redshifts for 25 galaxies in the central HDF, 13 of which had no prior published spectroscopic redshift. Of the remaining 49 galaxies, 30 are located in the single-orbit HDF flanking fields. We discuss the redshift distribution of the serendipitous sample, which contains galaxies in the range 0.10<z<5.77 with a median redshift of z=0.85, and we present strong evidence for redshift clustering. By comparing our spectroscopic redshifts with optical/IR photometric studies of the HDF, we find that photometric redshifts are in most cases capable of producing reasonable predictions of galaxy redshifts. Finally, we estimate the line-of-sight velocity dispersion and the corresponding mass and expected X-ray luminosity of the galaxy cluster, we present strong arguments for interpreting the Chandra source as an obscured active galactic nucleus, and we discuss in detail the spectrum of one of the candidate z>~5 Lyα emitters. Based on observations made 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 generous financial support of the W. M. Keck Foundation.
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