J/ApJS/253/56 Galaxy clusters from the DESI surveys. I. (Zou+, 2021)
Galaxy clusters from the DESI legacy imaging surveys.
I. Cluster detection.
Zou H., Gao J., Xu X., Zhou X., Ma J., Zhou Z., Zhang T., Nie J., Wang J.,
Xue S.
<Astrophys. J. Suppl. Ser., 253, 56 (2021)>
=2021ApJS..253...56Z 2021ApJS..253...56Z
ADC_Keywords: Clusters, galaxy; Redshifts; Photometry, ugriz;
Photometry, infrared; Surveys
Keywords: Galaxy clusters ; Photometry ; Sky surveys
Abstract:
Based on the photometric redshift catalog of Zou+ (2019ApJS..242....8Z 2019ApJS..242....8Z),
we apply a fast clustering algorithm to identify 540432 galaxy
clusters at z≤1 in the DESI legacy imaging surveys, which cover a sky
area of about 20000deg2. Monte Carlo simulations indicate that the
false-detection rate of our detecting method is about 3.1%. The total
masses of galaxy clusters are derived using a calibrated richness-mass
relation that is based on the observations of X-ray emission and the
Sunyaev and Zel'dovich effect. The median redshift and mass of our
detected clusters are about 0.53 and 1.23x1014M☉,
respectively. Comparing with previous clusters identified using the
data of the Sloan Digital Sky Survey; we can recognize most of them,
especially those with high richness. Our catalog will be used for
further statistical studies on galaxy clusters and environmental
effects on galaxy evolution, etc.
Description:
The Dark Energy Spectroscopic Instrument (DESI) is planned to conduct
a large-scale spectroscopic survey with 5000-fiber robots installed on
the focal plane of the 4m Mayall telescope at Kitt Peak, Arizona.
It will measure the redshifts of about 35 million galaxies and quasars
over a 5yr period (2019-2024), aiming to explore the structure growth
and expansion history of the universe.
The DESI legacy imaging surveys are designed to provide spectroscopic
targets for DESI. They are composed of three public optical surveys
including the Beijing-Arizona Sky Survey (Zou+ 2017PASP..129f4101Z 2017PASP..129f4101Z),
the Dark Energy Camera Legacy Survey (Blum+ 2016AAS...22831701B), and
the Mayall z-band legacy survey (Silva+ 2016AAS...22831702S), which
jointly image a sky area of ∼14000deg2 in the g, r, and z bands. The
legacy surveys also integrate the latest WISE observations and provide
deep force photometry in two WISE bands, W1 and W2
(Lang+ 2016AJ....151...36L 2016AJ....151...36L & Meisner+ 2019PASP..131l4504M 2019PASP..131l4504M). The latest
data release (DR8) covers an area of about 20000deg2 in both
northern and southern Galactic caps, which includes additional data
from the Dark Energy Survey (Dark Energy Survey Col.+ 2016MNRAS.460.1270D 2016MNRAS.460.1270D).
The optical imaging depths are 1.5-2mag deeper than the SDSS and the
infrared W1 and W2 bands are about 1-1.5mag deeper than the official
WISE data.
Throughout this paper, we assume a ΛCDM cosmology with
Ωm=0.3, ΩΛ=0.7, and H0=70km/s/Mpc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clusters.dat 346 540432 Galaxy clusters catalog (see Table 2)
table3.dat 79 3157 Galaxy clusters with the total mass measurements
from X-ray and SZ-effect observations
(see Section 3.3)
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See also:
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
J/ApJ/660/239 : MaxBCG catalog of galaxy clusters from SDSS (Koester+, 2007)
J/ApJS/191/254 : GMBCG galaxy cluster catalog from SDSS DR7 (Hao+, 2010)
J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)
J/ApJ/736/21 : Galaxy clusters opt. cat. from AMF on SDSS DR6 (Szabo+ 2011)
J/ApJ/734/68 : High redshift galaxy clusters in deep fields (Wen+, 2011)
J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)
J/ApJ/763/127 : Galaxy clusters in the SPT survey (Reichardt+, 2013)
J/A+A/558/A75 : 2XMMi/SDSS Galaxy Cluster Survey. II. (Takey+, 2013)
J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014)
J/A+A/564/A54 : 2XMMi/SDSS Galaxy Cluster Survey. III. (Takey+, 2014)
J/ApJS/216/27 : Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015)
J/ApJ/807/178 : Newly rich galaxy clusters in SDSS-DR12 (Wen+, 2015)
J/A+A/594/A27 : Planck Sunyaev-Zeldovich sources (PSZ2) (Planck+, 2016)
J/A+A/594/A32 : 3XMM/SDSS Stripe 82 Galaxy Cluster Survey. I. (Takey+, 2016)
J/other/NewA/58.61 : SDSS DR9 galaxy clusters optical catalog (Banerjee+, 2018)
J/A+A/626/A7 : ComPRASS catalogue (Tarrio+, 2019)
J/ApJS/247/25 : The SPTpol Extended Cluster Survey (Bleem+, 2020)
http://batc.bao.ac.cn/~zouhu/doku.php?id=projects:desi_clusters:start : DESI
clusters home page
Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 10 I10 --- ID [9500010/4558500155] Identifier (CLUSTER_ID)
12- 23 F12.8 deg RAdeg Right ascension for the density peak (J2000)
(RA_PEAK)
25- 36 F12.8 deg DEdeg [-59.7/84.8] Declination for the density
peak (J2000) (DEC_PEAK)
38- 45 F8.6 --- zphot [0.01/1] Photometric redshift for the
density peak (PZ_PEAK)
47- 56 F10.6 --- zspec [0.01/1.55]?=-10 Spectroscopic redshift for
the density peak (SZ_PEAK)
58- 59 I2 --- den [4/92] Local density for the peak (DEN_PEAK)
61- 71 F11.6 --- Bkg [-438.5/11.7] Local background density for
the peak (BKG_PEAK)
73- 84 F12.8 deg RAMdeg Mean right ascension of possible members
(J2000) (RA_MEAN)
86- 97 F12.8 deg DEMdeg Mean declination of possible members (J2000)
(DEC_MEAN)
99-106 F8.4 --- Ng [10/182] Number of member galaxies within
1Mpc from the cluster center (N_1MPC)
108-117 F10.6 Lsun Ltot [2/881] Total luminosity of member galaxies
within 1Mpc from the cluster center (L_1MPC)
119-125 F7.4 [Msun] M500 [12.5/15.2] Total mass of the cluster (M_500)
127-132 F6.4 Mpc R500 [0.19/1.52] Characteristic radius (R_500)
134-140 F7.3 --- Richness [0.91/206.2] Cluster richness
142-153 F12.8 deg RABdeg Right ascension for the BCG (J2000) (RA_BCG)
155-166 F12.8 deg DEBdeg Declination for the BCG (J2000) (DEC_BCG)
168-172 F5.3 --- zphotB [0.01/1.1] Photometric redshift for the BCG
(PZ_BCG)
174-178 F5.3 --- e_zphotB [0.004/0.1] ZphotB uncertainty (PZERR_BCG)
180-189 F10.6 --- zspecB [0.01/1.62]?=-10 Spectroscopic redshift for
the BCG (SZ_BCG)
191-197 F7.4 mag gmag [11.99/26.32] CTIO/DECam g band magnitude
for the BCG (MAGGBCG)
199-205 F7.4 mag rmag [11.13/23] CTIO/DECam r band magnitude
for the BCG (MAGRBCG)
207-213 F7.4 mag zmag [10.45/22.92] CTIO/DECam z band magnitude
for the BCG (MAGZBCG)
215-221 F7.4 mag W1mag [10.68/24.64] WISE W1 (3.4um) band
magnitude for the BCG (MAGW1BCG)
223-229 F7.4 mag W2mag [11.3/28.73] WISE W2 (4.6um) band magnitude
for the BCG (MAGW2BCG)
231-239 E9.4 mag e_gmag [9.2e-5/3.5] Uncertainty on gmag
(MAGERRGBCG)
241-249 E9.4 mag e_rmag [5.8e-5/0.3] Uncertainty on rmag
(MAGERRRBCG)
251-259 E9.4 mag e_zmag [6.5e-5/0.5] Uncertainty on zmag
(MAGERRZBCG)
261-269 E9.4 mag e_W1mag [6.9e-5/3.4] Uncertainty on W1mag
(MAGERRW1BCG)
271-279 E9.4 mag e_W2mag [0.00019/454] Uncertainty on W2mag
(MAGERRW2BCG)
281-287 F7.3 mag gMag [-26.11/-18.92] Absolute g-band magnitude
for the BCG (MAGABSG_BCG)
289-295 F7.3 mag rMag [-26.85/-20.50] Absolute r-band magnitude
for the BCG (MAGABSR_BCG)
297-303 F7.3 mag zMag [-26.63/-19.72] Absolute z-band magnitude
for the BCG (MAGABSZ_BCG)
305-311 F7.3 mag W1Mag [-27.2/-17.3] Absolute WISE W1 (3.4um) band
magnitude for the BCG (MAGABSW1_BCG)
313-319 F7.3 mag W2Mag [-27.34/-12.87] Absolute WISE W2 (4.6um)
band magnitude for the BCG (MAGABSW2_BCG)
321-328 F8.5 Msun Mass [9/12.5] Logarithmic stellar mass for the
BCG (MASSBESTBCG)
330-337 F8.5 Msun b_Mass [8.8/12.5]? Mass lower limit with 68%
confidence level (MASSINFBCG)
339-346 F8.5 Msun B_Mass [9.1/12.6]? Mass upper limit with 68%
confidence level (MASSSUPBCG)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/3157] Running sequence number
6- 14 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
16- 24 F9.5 deg DEdeg Declination in decimal degrees (J2000)
26- 31 F6.4 --- z [0.003/1.27] Redshift
33- 39 F7.4 10+14Msun M500 [0.018/21.8] Total mass
41- 46 F6.4 10+14Msun e_M500 [0.04/2.4] M500 uncertainty
48- 53 F6.4 Mpc R500 [0.18/1.71] Characteristic radius
55- 60 F6.4 Mpc e_R500 [0.006/0.92] R500 uncertainty
62- 79 A18 --- Ref Reference(s) (1)
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Note (1): References as follows:
P11 = Piffaretti et al. (2011, J/A+A/534/A109)
P15 = Planck Collaboration et al. (2016, J/A+A/594/A27)
W15 = Wen & Han (2015, J/ApJ/807/178)
T13 = Takey et al. (2013, J/A+A/558/A75)
T14 = Takey et al. (2014, J/A+A/564/A54)
T16 = Takey et al. (2016, J/A+A/594/A32)
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History:
From electronic version of the journal for Table 3
Table 2 downloaded at:
http://batc.bao.ac.cn/~zouhu/doku.php?id=projects:desi_clusters:start
(End) Emmanuelle Perret [CDS] 01-Jul-2021