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The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Analysis and Data Release 2

Masters, Daniel C. and Stern, Daniel K. and Cohen, Judith G. and Capak, Peter L. and Stanford, S. Adam and Hernitschek, Nina and Galametz, Audrey and Davidzon, Iary and Rhodes, Jason D. and Sanders, Dave and Mobasher, Bahram and Castander, Francisco and Pruett, Kerianne and Fotopoulou, Sotiria (2019) The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Analysis and Data Release 2. Astrophysical Journal, 877 (2). Art. No. 81. ISSN 1538-4357. doi:10.3847/1538-4357/ab184d.

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The Complete Calibration of the Color-Redshift Relation (C3R2) survey is a multi-institution, multi-instrument survey that aims to map the empirical relation of galaxy color to redshift to i ~ 24.5 (AB), thereby providing a firm foundation for weak lensing cosmology with the Stage IV dark energy missions Euclid and WFIRST. Here we present 3171 new spectroscopic redshifts obtained in the 2016B and 2017A semesters with a combination of DEIMOS, LRIS, and MOSFIRE on the Keck telescopes. The observations come from all of the Keck partners: Caltech, NASA, the University of Hawaii, and the University of California. Combined with the 1283 redshifts published in DR1, the C3R2 survey has now obtained and published 4454 high-quality galaxy redshifts. We discuss updates to the survey design and provide a catalog of photometric and spectroscopic data. Initial tests of the calibration method performance are given, indicating that the sample, once completed and combined with extensive data collected by other spectroscopic surveys, should allow us to meet the cosmology requirements for Euclid, and make significant headway toward solving the problem for WFIRST. We use the full spectroscopic sample to demonstrate that galaxy brightness is weakly correlated with redshift once a galaxy is localized in the Euclid or WFIRST color space, with potentially important implications for the spectroscopy needed to calibrate redshifts for faint WFIRST and LSST sources.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Masters, Daniel C.0000-0001-5382-6138
Stern, Daniel K.0000-0003-2686-9241
Cohen, Judith G.0000-0002-8039-4673
Capak, Peter L.0000-0003-3578-6843
Hernitschek, Nina0000-0003-1681-0430
Galametz, Audrey0000-0002-1504-8117
Davidzon, Iary0000-0002-2951-7519
Rhodes, Jason D.0000-0002-4485-8549
Sanders, Dave0000-0002-1233-9998
Castander, Francisco0000-0001-7316-4573
Fotopoulou, Sotiria0000-0002-9686-254X
Additional Information:© 2019 The American Astronomical Society. Received 2018 November 30; revised 2019 March 19; accepted 2019 April 3; published 2019 May 28. We thank the anonymous referee for a thorough and constructive report that improved this manuscript. The research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. D.M., D.S., P.C., and J.R. acknowledge support by NASA ROSES grant 12-EUCLID12-0004. D.M. acknowledges support for this work from a NASA Postdoctoral Program Fellowship. This work was enabled by a NASA Keck grant.
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:astronomical databases – catalogs – cosmology: observations – galaxies: distances and redshifts – surveys
Issue or Number:2
Record Number:CaltechAUTHORS:20190521-144030880
Persistent URL:
Official Citation:Daniel C. Masters et al 2019 ApJ 877 81
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95650
Deposited By: Tony Diaz
Deposited On:21 May 2019 21:49
Last Modified:16 Nov 2021 17:14

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