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Title: Photometric Redshifts and Stellar Masses for Galaxies from the DESI Legacy Imaging Surveys

Journal Article · · The Astrophysical Journal. Supplement Series (Online)
ORCiD logo [1];  [2];  [1]; ORCiD logo [3]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. of Optical Astronomy, National Astronomical Observatories
  2. Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. of Optical Astronomy, National Astronomical Observatories; Univ. of Chinese Academy of Sciences (CAS), Beijing (China). School of Astronomy and Space Science
  3. Univ. of Science and Technology of China, Hefei (China). Key Lab. for Research in Galaxies and Cosmology, Dept. of Astronomy

We present a catalog of photometric redshifts and stellar masses for galaxies from imaging surveys serving the Dark Energy Spectroscopic Instrument project. The imaging footprints cover an area of over 14,000 deg2. This catalog contains about 0.17 billion morphologically classified galaxies with r < 23 mag. It covers the redshift range of z < 1 and the mass range of $$8.4\lt \mathrm{log}({M}_{* })\lt 11.9$$. A total of five photometric bands are used, including three optical filters (g, r, and z) and two infrared filters (Wide-field Infrared Survey Explorer W1 and W2). We use k-nearest neighbors and local linear regression algorithms to estimate photometric redshifts. Based on a spectroscopic sample of about 2.2 million galaxies, we achieve a redshift bias of $$\overline{{\rm{\Delta }}{z}_{\mathrm{norm}}}$$ = 2.4 × 10-4, accuracy of $${\sigma }_{{\rm{\Delta }}{z}_{\mathrm{norm}}}$$ = 0.017, and outlier rate of about 5.1%. The stellar mass and other physical parameters are derived by stellar population synthesis model fitting based on our photometric redshifts. The differences in $$\mathrm{log}({M}_{* })$$ derived using spectroscopic and photometric redshifts present a 1σ dispersion of 0.09 dex.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH1123
OSTI ID:
1528875
Journal Information:
The Astrophysical Journal. Supplement Series (Online), Vol. 242, Issue 1; ISSN 1538-4365
Publisher:
American Astronomical Society/IOPCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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GAz: A Genetic Algorithm for Photometric Redshift Estimation text January 2014
The Differential Size Growth of Field and Cluster Galaxies at z=2.1 Using the ZFOURGE Survey text January 2015
UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field text January 2015
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Photometric redshifts for the SDSS Data Release 12 text January 2016
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The Second Data Release of the Beijing-Arizona Sky Survey text January 2017
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Stellar population synthesis at the resolution of 2003 text January 2003
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The Morphology - Density Relation in z ~ 1 Clusters text January 2005
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The Third Data Release of the Beijing–Arizona Sky Survey journal October 2019

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