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 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- 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