J/ApJ/891/129 The HeCS-omnibus catalog: SDSS & MMT sp. obs. (Sohn+, 2020)
Velocity dispersions of brightest cluster galaxies and their host clusters.
Sohn J., Geller M.J., Diaferio A., Rines K.J.
<Astrophys. J., 891, 129 (2020)>
=2020ApJ...891..129S 2020ApJ...891..129S
ADC_Keywords: Clusters, galaxy; Redshifts; Spectra, optical; Velocity dispersion
Galaxies, spectra; Surveys
Keywords: Brightest cluster galaxies ; Galaxy clusters ;
Galaxy dark matter halos ; Redshift surveys
Abstract:
We explore connections between brightest cluster galaxies (BCGs) and
their host clusters. We first construct a HeCS-omnibus cluster sample
including 227 galaxy clusters within 0.02<z<0.30; the total number of
spectroscopic members from MMT/Hectospec and SDSS observations is
52325. Taking advantage of the large spectroscopic sample, we compute
physical properties of the clusters including the dynamical mass and
cluster velocity dispersion (σcl). We also measure the central
stellar velocity dispersion of the BCGs (σ*,BCGs) to examine
the relation between BCG velocity dispersion and cluster velocity
dispersion for the first time. The observed relation between BCG
velocity dispersion and the cluster velocity dispersion is remarkably
tight. Interestingly, the σ*,BCG/σcl ratio decreases
as a function of σcl unlike the prediction from the numerical
simulation of Dolag+ (2010MNRAS.405.1544D 2010MNRAS.405.1544D). The trend in
σ*,BCG/σcl suggests that BCG formation is more
efficient in lower mass halos.
Description:
We first collected data from various spectroscopic surveys, i.e. the
Cluster Infall Region Surveys (CIRS, Rines & Diaferio 2006, J/AJ/132/1275)
with additional spectroscopic data including SDSS DR14; the Hectospec
Cluster Survey (HeCS, Rines+ 2013, J/ApJ/767/15 ; 2016, J/ApJ/819/63 ;
2018, J/ApJ/862/172 and K. J. Rines et al. 2020, in preparation) which
is a large spectroscopic survey of galaxy clusters using the 300 fiber
Hectospec mounted on 6.5m Multi-Mirror Telescope (MMT); the Arizona
Cluster Redshift Survey (ACReS, Haines+ 2013ApJ...775..126H 2013ApJ...775..126H). ACReS is
a spectroscopic survey also using MMT/Hectospec and; other independent
Hectospec observational campaigns: A68, A611, A1703, A2537
(P.I.: M. Geller), and A2457 (P.I.: J. Sohn). See Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 99 227 HeCS-omnibus clusters
table3.dat 110 227 The brightest cluster galaxies (BCGs) of the
HeCS-omnibus clusters
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See also:
VII/4 : Abell and Zwicky Clusters of Galaxies (Abell+ 1974)
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/ApJ/534/114 : RASSCALS: X-ray and optical study (Mahdavi+, 2000)
J/AJ/132/1275 : CIRS (Cluster Infall Regions in the SDSS). I. (Rines+, 2006)
J/A+A/461/397 : RASS-SDSS galaxy cluster survey. V. (Popesso+, 2007)
J/ApJ/660/239 : MaxBCG cat. of galaxy clusters from SDSS (Koester+, 2007)
J/AJ/137/4795 : Dynamical state of brightest cluster galaxies (Coziol+, 2009)
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/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)
J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013)
J/ApJ/797/82 : Brightest cluster galaxies in Abell clusters (Lauer+, 2014)
J/A+A/581/A41 : OmegaWINGS BV phot. of galaxy clusters (Gullieuszik+, 2015)
J/ApJ/819/63 : Hectospec survey of SZ clusters (HeCS-SZ) (Rines+, 2016)
J/A+A/599/A81 : OmegaWINGS local clusters of galaxies (Moretti+, 2017)
J/ApJS/229/20 : MMT/Hectospec redshift survey for Abell 2029 (Sohn+, 2017)
J/ApJ/862/172 : HeCS-red: redMaPPer clusters with HectoSpec (Rines+, 2018)
J/ApJ/872/192 : A spectroscopic census of A2029 members (Sohn+, 2019)
J/ApJ/880/142 : Spectroscopic members of COSMOS X-ray systems (Sohn+, 2019)
J/ApJS/247/43 : WWFI g'-band obs. of bright cluster galaxies (Kluge+, 2020)
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- ID Name of clusters
19- 28 F10.6 deg RAdeg [0.5/359] Right Ascension (J2000)
30- 39 F10.6 deg DEdeg [-10.42/82.32] Declination (J2000)
41- 46 F6.4 --- zspec [0.02/0.31] Spectroscopic redshift
48- 51 I4 --- Nmem [16/1209] Number of spectroscopic members
53- 55 I3 --- N200 [2/672] Number of spectroscopic members
within R200
57- 60 I4 km/s sigmaCl [-1/1351] Velocity dispersion of clusters
62- 64 I3 km/s e_sigmaCl [0/207] Uncertainty in sigma
66- 69 F4.2 Mpc R200 [0.3/2.4] Radius R200
71- 74 F4.2 Mpc e_R200 [0/0.6] Uncertainty in R200
76- 80 F5.2 10+14Msun M200 [0.06/18.5] Mass M200
82- 85 F4.2 10+14Msun e_M200 [0/5.1] Uncertainty in M200
87- 92 F6.2 10+36W Lx [0.17/250]?=-99 X-ray luminosity from
the MCXC catalog, in 1043erg/s units
94- 99 F6.2 10+14Msun Mx [0.17/12.5]?=-99 Cluster mass inferred
from X-ray luminosity
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- ID Name of clusters
19- 37 I19 --- objID SDSS Object ID of BCGs
39- 48 F10.6 deg RAdeg ?=-99 Right Ascension of BCGs (J2000)
50- 59 F10.6 deg DEdeg ?=-99 Declination of BCGs (J2000)
61- 69 F9.5 --- zspec [0.019/0.3]?=-99 Spectroscopic redshift of BCGs
71- 76 F6.2 --- rm [12/115.3]?=0 SDSS cModel magnitude of BCGs
78- 83 F6.2 --- e_rm [0/0.4]?=-99 Uncertainty in rm
85- 90 F6.2 Msun Mass [9.3/12.4]?=-99 Stellar mass of BCGs
92- 97 F6.2 Msun e_Mass [0.03/0.7]?=-99 Uncertainty in Mass
99-101 I3 km/s sigma [-96/589]?=-99 Velocity dispersion of BCGs
103-105 I3 km/s e_sigma [2/96]?=-99 Uncertainty in sigma
107-110 A4 --- r_sigma Source of the velocity dispersion (MMT or SDSS)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Aug-2021