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J/ApJ/841/111  C3R2 survey: high-confidence redshifts from DR1  (Masters+, 2017)

The Complete Calibration of the Color-Redshift Relation (C3R2) survey: survey overview and Data Release 1. Masters D.C., Stern D.K., Cohen J.G., Capak P.L., Rhodes J.D., Castander F.J., Paltani S. <Astrophys. J., 841, 111 (2017)> =2017ApJ...841..111M
ADC_Keywords: Galaxy catalogs ; Spectroscopy ; Redshifts Keywords: astronomical databases: catalogs ; astronomical databases: surveys ; cosmology: observations ; galaxies: distances and redshifts 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. 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. Description: The Complete Calibration of the Color-Redshift Relation (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. The Keck portion of the C3R2 survey is a joint effort between Caltech (PI: J. Cohen), NASA (PI: D. Stern), the University of California (PI: B. Mobasher), the University of Hawaii (PI: D. Sanders). European participation in C3R2 with the GTC (PI: C. Gutierrez) and VLT (PI: F. Castander), as well as Harvard participation with MMT (PI: D. Eisenstein), will commence in 2017. The first five nights of observing with Keck were allocated by Caltech in the 2016A semester: three nights on DEIMOS (2015 Dec 15, 2016 Feb 29 and 2016 Mar 01), and one night each with LRIS (2016 Apr 09) and MOSFIRE (2016 Feb 28). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 73 1283 Keck spectroscopic results
See also: II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007) VII/265 : COSMOS Morphological Catalog (V1.1) (Tasca+ 2009) II/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012) J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007) J/ApJS/172/383 : AGN candidates in the COSMOS field (Trump+, 2007) J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009) J/ApJ/709/572 : COSMOS 70um sources (Kartaltepe+, 2010) J/ApJS/203/24 : Structural param. of galaxies in CANDELS (van der Wel+, 2012) J/ApJS/206/10 : CANDELS multiwavelength catalog (Galametz+, 2013) J/ApJ/769/80 : Spitzer/IRAC observations of five deep fields (Ashby+, 2013) J/ApJS/212/18 : An atlas of UV-to-MIR galaxy SEDs (Brown+, 2014) J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014) J/ApJ/795/165 : Line ratios in z∼2-3 gal. from KBSS-MOSFIRE (Steidel+, 2014) J/ApJ/801/97 : GOODS-S+UDS stellar masses from CANDELS (Santini+, 2015) J/ApJ/830/51 : FourStar galaxy evolution survey (ZFOURGE) (Straatman+, 2016) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Field Field identifier ("COSMOS", "EGS" or "UDS") 7 A1 --- --- [-] 8- 14 I7 --- ID [539/1709617]? Identifier within Field (1) 16- 17 I2 h RAh Hour of Right Ascension (J2000) 19- 20 I2 min RAm Minute of Right Ascension (J2000) 22- 27 F6.3 s RAs Second of Right Ascension (J2000) 29 A1 --- DE- Sign of the Declination (J2000) 30- 31 I2 deg DEd Degree of Declination (J2000) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) 36- 40 F5.2 arcsec DEs Arcsecond of Declination (J2000) 42- 52 A11 --- Mask Mask name 54- 56 I03 --- Slit [000/106] Slit number 57 A1 --- f_Slit [s] s: serendipitous source 59- 62 F4.1 mag imag [17.8/25.2]?=-1 i-band AB magnitude 64- 69 F6.4 --- zspec [0/3.8] Measured spectroscopic redshift 71- 73 F3.1 --- Qual [3/4] Redshift quality flag (2)
Note (1): Blank values when the observed objects have no counterparts in our source catalogs. Note (2): Redshift quality flag as follows: 4.0 = certain; 3.5 = very high confidence; 3.0 = high confidence.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Jan-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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