A catalog of color-based redshift estimates for z ≲ 4 galaxies in the Hubble Deep Field

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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 σz ≃ 0.03 to 0.1 for z ≲ 2 galaxies, and from σz ≃ 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.

Original languageEnglish (US)
Pages (from-to)2081-2085
Number of pages5
JournalAstronomical Journal
Volume116
Issue number5
DOIs
StatePublished - Nov 1998

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Galaxies: distances and redshifts
  • Methods: data analysis

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