J/ApJ/829/44 NGVS. XX. RedGOLD background galaxy clusters (Licitra+, 2016)
The Next Generation Virgo Cluster Survey.
XX. RedGOLD background galaxy cluster detections.
Licitra R., Mei S., Raichoor A., Erben T., Hildebrandt H., Munoz R.P.,
Van Waerbeke L., Cote P., Cuillandre J.-C., Duc P.-A., Ferrarese L.,
Gwyn S.D.J., Huertas-Company M., Lancon A., Parroni C., Puzia T.H.
<Astrophys. J., 829, 44-44 (2016)>
=2016ApJ...829...44L 2016ApJ...829...44L (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts ; Photometry
Keywords: galaxies: clusters: general; galaxies: general;
galaxies: high-redshift
Abstract:
We build a background cluster candidate catalog from the Next
Generation Virgo Cluster Survey (NGVS) using our detection algorithm
RedGOLD. The NGVS covers 104deg2 of the Virgo cluster in the
u*,g,r,i,z-bandpasses to a depth of g∼25.7mag (5σ). Part of
the survey was not covered or has shallow observations in the r band.
We build two cluster catalogs: one using all bandpasses, for the
fields with deep r-band observations (∼20deg2), and the other using
four bandpasses (u*,g,i,z) for the entire NGVS area. Based on our
previous Canada-France-Hawaii Telescope Legacy Survey W1 studies, we
estimate that both of our catalogs are ∼100% (∼70%) complete and ∼80%
pure, at z≤0.6 (z≲1), for galaxy clusters with masses of
M≳1014M☉. We show that when using four bandpasses, though the
photometric redshift accuracy is lower, RedGOLD detects massive galaxy
clusters up to z∼1 with completeness and purity similar to the
five-band case. This is achieved when taking into account the bias in
the richness estimation, which is ∼40% lower at 0.5≤z<0.6 and ∼20%
higher at 0.6<z<0.8, with respect to the five-band case. RedGOLD
recovers all the X-ray clusters in the area with mass
M500>1.4x1014M☉ and 0.08<z<0.5. Because of our different
cluster richness limits and the NGVS depth, our catalogs reach lower
masses than the published redMaPPer cluster catalog over the area, and
we recover ∼90%-100% of its detections.
Description:
The Next Generation Virgo Cluster Survey (NGVS) observations were
performed with the MegaCam instrument, the optical imager mounted on
MegaPrime, at the prime focus of the CFHT. In our analysis, we use the
data reduction and photometric catalog from Raichoor+
(2014ApJ...797..102R 2014ApJ...797..102R). We refer to this work for further details.
The NGVS observations were obtained from 01/03/2008 until 12/06/2013,
under several CFHT programs (P.I. L. Ferrarese: 08AC16, 09AP03,
09AP04, 09BP03, 09BP04, 10AP03, 10BP03, 11AP03, 11BP03, 12AP03,
12BP03, 13AC02, 13AP03; P.I. S. Mei: 08AF20; P.I. J.-C. Cuillandre:
10AD99, 12AD99 and P.I. Y.-T. Chen: 10AT06).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
ngvs4.dat 62 1724 NGVS RedGOLD cluster candidate catalog for the
whole NGVS area, using only four optical bands
ngvs5.dat 62 294 NGVS RedGOLD cluster candidate catalog for the
∼20 square degree region with deep r-band
observations
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Description of file: The "ori.tar" archive in FTP contains
the 2 original FITS files and associated "readme.txt".
See also:
B/cfht : Log of CFHT Exposures (CADC, 1979-)
J/ApJS/227/12 : NGVS XXV. Virgo globular clusters photometry (Powalka+, 2016)
J/ApJ/802/30 : NGVS VI. Ultra-compact dwarfs in M87 (Zhang+, 2015)
J/ApJS/215/22 : The Extended Virgo Cluster Catalog (EVCC) (Kim+, 2014)
J/A+A/566/A140 : Catalog of XMM X-ray galaxy groups (Gozaliasl+, 2014)
J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014)
J/MNRAS/423/1024 : XCS-DR1 Cluster Catalogue (Mehrtens+, 2012)
J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)
J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)
J/MNRAS/413/1145 : Galaxy clusters in the COSMOS field (Bellagamba+, 2011)
J/A+A/494/845 : Galaxy clusters in the CFHTLS (Grove+, 2009)
J/A+A/461/81 : Galaxy clusters in the CFHTLS (Olsen+, 2007)
Byte-by-byte Description of file: ngvs[45].dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right ascension of the brightest galaxy (J2000)
11- 18 F8.5 deg DEdeg Declination of the brightest galaxy (J2000)
20- 26 F7.5 --- zphot [0.1/1.1] Photometric cluster redshift (PHOTOZ)
28- 34 F7.5 --- e_zphot [0.0003/0.02] The bootstrap statistical error
in photometric redshift (ePHOTOZ)
36- 43 F8.6 --- zspec [0.08/0.9]?=0 Average spectroscopic redshift,
when available
from Raichoor+, 2014ApJ...797..102R 2014ApJ...797..102R (1)
45- 49 F5.2 --- Sdet [4/32] Detection significance σdet
51- 56 F6.2 --- Rich [9/109] Cluster richness λ
58- 62 F5.2 --- e_Rich [3/11] The bootstrap statistical uncertainty on
cluster richness λerr
--------------------------------------------------------------------------------
Note (1): To estimate the accuracy of their redshift estimates,
Raichoor+ (2014ApJ...797..102R 2014ApJ...797..102R) used spectroscopic redshifts from
different surveys (see their Table 4). For the NGVS fields, they used
spectroscopic redshifts from the SDSS (Eisenstein+ 2001AJ....122.2267E 2001AJ....122.2267E;
Strauss+ 2002AJ....124.1810S 2002AJ....124.1810S; Dawson+ 2013AJ....145...10D 2013AJ....145...10D), the Virgo
Dwarf Globular Cluster Survey (P. Guhathakurta+ 2016, in preparation),
two spectroscopic programs at the Anglo-Australian Telescope
(H. X. Zhang+ 2015, 2016, in preparation) and at the Multiple Mirror
Telescope (E. Peng+ 2016, in preparation).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Ferrarese et al. Paper I. 2012ApJS..200....4F 2012ApJS..200....4F
Paudel et al. Paper IV. 2013ApJ...767..133P 2013ApJ...767..133P
Zhu et al. Paper V. 2014ApJ...792...59Z 2014ApJ...792...59Z
Zhang et al. Paper VI. 2015ApJ...802...30Z 2015ApJ...802...30Z Cat. J/ApJ/802/30
Sanchez-Janssen et al. Paper VII. 2016ApJ...820...69S 2016ApJ...820...69S
Durrel et al. Paper VIII. 2014ApJ...794..103D 2014ApJ...794..103D
Grossauer et al. Paper IX. 2015ApJ...807...88G 2015ApJ...807...88G
Liu et al. Paper X. 2015ApJ...812...34L 2015ApJ...812...34L Cat. J/ApJ/812/34
Raichoor et al. Paper XI. 2014ApJ...797..102R 2014ApJ...797..102R
Guerou et al. Paper XII. 2015ApJ...804...70G 2015ApJ...804...70G
Ferrarese et al. Paper XIII. 2016ApJ...824...10F 2016ApJ...824...10F
Ferrarese et al. Paper XIV. 2020ApJ...890..128F 2020ApJ...890..128F Cat. J/ApJ/890/128
Raichoor et al. Paper XV. 2014ApJ...797..102R 2014ApJ...797..102R
Toloba et al. Paper XVI. 2016ApJ...822...51T 2016ApJ...822...51T
Sun et al. Paper XVII. 2019ApJ...885..145S 2019ApJ...885..145S
Cantiello et al. Paper XVIII. 2018ApJ...856..126C 2018ApJ...856..126C
Lokhorst et al. Paper XIX. 2016ApJ...819..124L 2016ApJ...819..124L
Licitra et al. Paper XX. 2016ApJ...829...44L 2016ApJ...829...44L This catalog
Parroni et al. Paper XXI. 2017ApJ...848..114P 2017ApJ...848..114P
Paudel et al. Paper XXII. 2017ApJ...834...66P 2017ApJ...834...66P
Sanchez-Janssen et al. Paper XXIII. 2019ApJ...878...18S 2019ApJ...878...18S Cat. J/ApJ/878/18
Roediger et al. Paper XXIV. 2017ApJ...836..120R 2017ApJ...836..120R
Powalka et al. Paper XXV. 2016ApJS..227...12P 2016ApJS..227...12P Cat. J/ApJS/227/12
Powalka et al. Paper XXVI. 2017ApJ...844..104P 2017ApJ...844..104P
Fantin et al. Paper XXVIII. 2017ApJ...843...53F 2017ApJ...843...53F
Lim et al. Paper XXX. 2020ApJ...899...69L 2020ApJ...899...69L
Longobardi et al. Paper XXXI. 2018ApJ...864...36L 2018ApJ...864...36L
Powalka et al. Paper XXXII. 2018ApJ...856...84P 2018ApJ...856...84P
Liu et al. Paper XXXIV. 2020ApJS..250...17L 2020ApJS..250...17L Cat. J/ApJS/250/17
(End) Emmanuelle Perret [CDS] 15-Mar-2017