skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1

Abstract

A key goal of the Stage IV dark energy experiments Euclid , LSST, and WFIRST is to measure the growth of structure with cosmic time from weak lensing analysis over large regions of the sky. Weak lensing cosmology will be challenging: in addition to highly accurate galaxy shape measurements, statistically robust and accurate photometric redshift (photo- z ) estimates for billions of faint galaxies will be needed in order to reconstruct the three-dimensional matter distribution. Here we present an overview of and initial results from the Complete Calibration of the Color–Redshift Relation (C3R2) survey, which is designed specifically to calibrate the empirical galaxy color–redshift relation to the Euclid depth. These redshifts will also be important for the calibrations of LSST and WFIRST . The C3R2 survey is obtaining multiplexed observations with Keck (DEIMOS, LRIS, and MOSFIRE), the Gran Telescopio Canarias (GTC; OSIRIS), and the Very Large Telescope (VLT; FORS2 and KMOS) of a targeted sample of galaxies that are most important for the redshift calibration. We focus spectroscopic efforts on undersampled regions of galaxy color space identified in previous work in order to minimize the number of spectroscopic redshifts needed to map the color–redshift relation to the required accuracy. Wemore » present the C3R2 survey strategy and initial results, including the 1283 high-confidence redshifts obtained in the 2016A semester and released as Data Release 1.« less

Authors:
 [1]; ;  [2];  [3];  [4];  [5];  [6]
  1. Infrared Processing and Analysis Center, Pasadena, CA 91125 (United States)
  2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)
  3. California Institute of Technology, Pasadena, CA 91125 (United States)
  4. Spitzer Science Center, Pasadena, CA 91125 (United States)
  5. Institut de Ciències de lEspai (ICE, IEEC/CSIC), E-08193 Bellaterra (Barcelona) (Spain)
  6. Department of Astronomy, University of Geneva, Ch. dEcogia 16, 1290 Versoix (Switzerland)
Publication Date:
OSTI Identifier:
22663556
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 841; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; CALIBRATION; CATALOGS; COSMOLOGY; DISTRIBUTION; GALAXIES; NONLUMINOUS MATTER; RED SHIFT; SPACE; TELESCOPES; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Masters, Daniel C., Stern, Daniel K., Rhodes, Jason D., Cohen, Judith G., Capak, Peter L., Castander, Francisco J., and Paltani, Stéphane. The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6F08.
Masters, Daniel C., Stern, Daniel K., Rhodes, Jason D., Cohen, Judith G., Capak, Peter L., Castander, Francisco J., & Paltani, Stéphane. The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1. United States. doi:10.3847/1538-4357/AA6F08.
Masters, Daniel C., Stern, Daniel K., Rhodes, Jason D., Cohen, Judith G., Capak, Peter L., Castander, Francisco J., and Paltani, Stéphane. Thu . "The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1". United States. doi:10.3847/1538-4357/AA6F08.
@article{osti_22663556,
title = {The Complete Calibration of the Color–Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1},
author = {Masters, Daniel C. and Stern, Daniel K. and Rhodes, Jason D. and Cohen, Judith G. and Capak, Peter L. and Castander, Francisco J. and Paltani, Stéphane},
abstractNote = {A key goal of the Stage IV dark energy experiments Euclid , LSST, and WFIRST is to measure the growth of structure with cosmic time from weak lensing analysis over large regions of the sky. Weak lensing cosmology will be challenging: in addition to highly accurate galaxy shape measurements, statistically robust and accurate photometric redshift (photo- z ) estimates for billions of faint galaxies will be needed in order to reconstruct the three-dimensional matter distribution. Here we present an overview of and initial results from the Complete Calibration of the Color–Redshift Relation (C3R2) survey, which is designed specifically to calibrate the empirical galaxy color–redshift relation to the Euclid depth. These redshifts will also be important for the calibrations of LSST and WFIRST . The C3R2 survey is obtaining multiplexed observations with Keck (DEIMOS, LRIS, and MOSFIRE), the Gran Telescopio Canarias (GTC; OSIRIS), and the Very Large Telescope (VLT; FORS2 and KMOS) of a targeted sample of galaxies that are most important for the redshift calibration. We focus spectroscopic efforts on undersampled regions of galaxy color space identified in previous work in order to minimize the number of spectroscopic redshifts needed to map the color–redshift relation to the required accuracy. We present the C3R2 survey strategy and initial results, including the 1283 high-confidence redshifts obtained in the 2016A semester and released as Data Release 1.},
doi = {10.3847/1538-4357/AA6F08},
journal = {Astrophysical Journal},
number = 2,
volume = 841,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}