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Title:
A Catalog of Color-based Redshift Estimates for Z <~ 4 Galaxies in the Hubble Deep Field
Authors:
Wang, Yun; Bahcall, Neta; Turner, Edwin L.
Affiliation:
AA(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544; , , ), AB(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544; , , ), AC(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544; , , )
Publication:
The Astronomical Journal, Volume 116, Issue 5, pp. 2081-2085. (AJ Homepage)
Publication Date:
11/1998
Origin:
AJ
AJ Keywords:
GALAXIES: DISTANCES AND REDSHIFTS, METHODS: DATA ANALYSIS
DOI:
10.1086/300592
Bibliographic Code:
1998AJ....116.2081W

Abstract

We derive simple empirical color-redshift relations for z <~ 4 galaxies in the Hubble Deep Field (HDF) using a linear function of three photometric colors (U-B, B-V, V-I). The dispersion between the estimated redshifts and the spectroscopically observed ones is small for relations derived in several separate color regimes; the dispersions range from sigma_z ~= 0.03 to 0.1 for z <~ 2 galaxies, and from sigma_z ~= 0.14 to 0.25 for z >~ 2 galaxies. We apply the color-redshift relations to the HDF photometric catalog and obtain estimated redshifts that are consistent with those derived from spectral template fitting methods. The advantage of these color-redshift relations is that they are simple and easy to use and do not depend on the assumption of any particular spectral templates; they provide model independent redshift estimates for z <~ 4 galaxies using only multiband photometry, and they apply to about 90% of all galaxies. We provide a color-based estimated redshift catalog of HDF galaxies to z <~ 4. We use the estimated redshifts to investigate the redshift distribution of galaxies in the HDF; we find peaks in the redshift distribution that suggest large-scale clustering of galaxies to at least z ~ 1 and that are consistent with those identified in spectroscopic probes of the HDF.
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