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

Masters, Daniel C.; Stern, Daniel K.; Cohen, Judith G.; Capak, Peter L.; Stanford, S. Adam; Hernitschek, Nina; Galametz, Audrey; Davidzon, Iary; Rhodes, Jason D.; Sanders, Dave; Mobasher, Bahram; Castander, Francisco; Pruett, Kerianne; Fotopoulou, Sotiria

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


Authors

Daniel C. Masters

Daniel K. Stern

Judith G. Cohen

Peter L. Capak

S. Adam Stanford

Nina Hernitschek

Audrey Galametz

Iary Davidzon

Jason D. Rhodes

Dave Sanders

Bahram Mobasher

Francisco Castander

Kerianne Pruett

Sotiria Fotopoulou



Abstract

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.13 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.

Citation

Masters, D. C., Stern, D. K., Cohen, J. G., Capak, P. L., Stanford, S. A., Hernitschek, N., …Fotopoulou, S. (2019). The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Analysis and Data Release 2. Astrophysical Journal, 877(2), Article 81. https://doi.org/10.3847/1538-4357/ab184d

Journal Article Type Article
Acceptance Date Apr 3, 2019
Online Publication Date May 28, 2019
Publication Date Jun 1, 2019
Deposit Date Jun 13, 2019
Publicly Available Date Jun 14, 2019
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 877
Issue 2
Article Number 81
DOI https://doi.org/10.3847/1538-4357/ab184d

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Copyright Statement
© 2019. The American Astronomical Society. All rights reserved.





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