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Title:
The Application of Photometric Redshifts to the SDSS Early Data Release
Authors:
Csabai, István; Budavári, Tamás; Connolly, Andrew J.; Szalay, Alexander S.; Győry, Zsuzsanna; Benítez, Narciso; Annis, Jim; Brinkmann, Jon; Eisenstein, Daniel; Fukugita, Masataka; Gunn, Jim; Kent, Stephen; Lupton, Robert; Nichol, Robert C.; Stoughton, Chris
Affiliation:
AA(Department of Physics, Eötvös Loránd University, Budapest, Pf. 32, H-1518 Budapest, Hungary.; Department of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218-2868.), AB(Department of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218-2868.), AC(Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15260.), AD(Department of Physics, Eötvös Loránd University, Budapest, Pf. 32, H-1518 Budapest, Hungary.; Department of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218-2868.), AE(Department of Physics, Eötvös Loránd University, Budapest, Pf. 32, H-1518 Budapest, Hungary.), AF(Department of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218-2868.), AG(Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510.), AH(Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349.), AI(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AJ(Institute for Cosmic Ray Research, University of Tokyo 3-2-1, Midori, Tanashi, Tokyo 188-8502, Japan.), AK(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001.), AL(Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510.), AM(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001.), AN(Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15232.), AO(Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510.)
Publication:
The Astronomical Journal, Volume 125, Issue 2, pp. 580-592. (AJ Homepage)
Publication Date:
02/2003
Origin:
UCP
AJ Keywords:
Galaxies: Distances and Redshifts, Galaxies: Photometry, Methods: Statistical
DOI:
10.1086/345883
Bibliographic Code:
2003AJ....125..580C

Abstract

The Early Data Release (EDR) from the Sloan Digital Sky Survey provides one of the largest multicolor photometric catalogs currently available to the astronomical community. In this paper we present the first application of photometric redshifts to the ~6 million extended sources in these data (with 1.8 million sources having r'<21). Utilizing a range of photometric redshift techniques, from empirical to template and hybrid techniques, we investigate the statistical and systematic uncertainties present in the redshift estimates for the EDR data. For r'<21, we find that the redshift estimates provide realistic redshift histograms with an rms uncertainty in the photometric redshift relation of 0.035 at r'<18 and rising to 0.1 at r'<21. We conclude by describing how these photometric redshifts and derived quantities, such as spectral type, rest-frame colors, and absolute magnitudes, are stored in the SDSS database. We provide sample queries for searching on photometric redshifts and list the current caveats and issues that should be understood before using these photometric redshifts in statistical analyses of the SDSS galaxies.
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