J/MNRAS/449/2345 Mass and luminosity of maxBCG galaxies groups (Proctor+, 2015)
A derivation of masses and total luminosities of galaxy groups and clusters in
the maxBCG catalogue.
Proctor R.N., Mendes de Oliveira C., Azanha L., Dupke R., Overzier R.
<Mon. Not. R. Astron. Soc., 449, 2345-2352 (2015)>
=2015MNRAS.449.2345P 2015MNRAS.449.2345P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy
Keywords: galaxies: clusters: general - galaxies: groups: general
Abstract:
We report the results of a multiwaveband analysis of the masses and
luminosities of ∼600 galaxy groups and clusters identified in the
maxBCG catalogue. These data are intended to form the basis of future
work on the formation of the m12 gap in galaxy groups and clusters.
We use SDSS spectroscopy and g-, r- and i-band photometry to estimate
galaxy group/cluster virial radii, masses and total luminosities. In
order to establish the robustness of our results, we compare them with
literature studies that utilize a variety of mass determinations
techniques (dynamical, X-ray and weak lensing) and total luminosities
estimated in the B, r, i and K wavebands. We also compare our results
to predictions derived from the Millennium Simulation. We find that,
once selection effects are properly accounted for, excellent agreement
exists between our results and the literature with the exception of a
single observational study. We also find that the Millennium
Simulation does an excellent job of predicting the effects of our
selection criteria. Our results show that, over the mass range ∼
1013-1015M☉, variations in the slope of the mass-luminosity
scaling relation with mass detected in this and many other literature
studies is in part the result of selection effects. We show that this
can have serious ramifications on attempts to determine how the
mass-to-light ratio of galaxy groups and cluster varies with mass.
Description:
Our sample was selected from groups identified in the maxBCG catalogue
of Koester et al. (2007, Cat. J/ApJ/660/239). This catalogue was
constructed from the SDSS photometric survey using a cluster finding
algorithm based on three well-defined properties of galaxies in
clusters: spatial clustering, the presence of a "red-sequence" and
the presence of a brightest cluster galaxy(BCG) at the centre of the
cluster (Koester et al., 2007ApJ...660..221K 2007ApJ...660..221K). Using this method,
Koester et al. (2007, Cat. J/ApJ/660/239) identify more than 13000
clusters. Using DR9 of the SDSS-III (Ahn et al., 2012ApJS..203...21A 2012ApJS..203...21A,
Cat. V/139), we then selected all the clusters from the maxBCG
catalogue that have a BCG with a spectroscopic redshift in the
redshift interval z=0.05-0.16 and possessing six or more
spectroscopically confirmed members.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 118 611 Results
--------------------------------------------------------------------------------
See also:
V/139 : SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
J/ApJ/660/239 : MaxBCG catalog of 13823 SDSS galaxy clusters (Koester+, 2007)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- ID Group ID, as given in the maxBCG catalogue
9- 17 F9.5 deg RAdeg Right ascension (J2000)
19- 27 F9.5 deg DEdeg Declination (J2000)
29- 35 F7.5 --- z Spectroscopic redshift
37- 39 I3 --- N Number of spectroscopically confirmed members
41- 46 F6.1 km/s sigma Velocity dispersion
48- 52 F5.1 km/s e_sigma Velocity dispersion error
54- 59 F6.3 [Msun] logMass Mass
61- 65 F5.3 [Msun] e_logMass rms uncertainty on Mass
67- 72 F6.3 [Lsun] logLB B band luminosity
74- 79 F6.3 [Lsun] logLg ?=- g band luminosity
81- 85 F5.3 [Lsun] e_logLg ?=- rms uncertainty on logLg
87- 92 F6.3 [Lsun] logLr r band luminosity
94- 98 F5.3 [Lsun] e_logLr rms uncertainty on logLr
100-105 F6.3 [Lsun] logLi ?=- i band luminosity
107-111 F5.3 [Lsun] e_logLi ?=- rms uncertainty on logLi
113-118 F6.3 [Lsun] logLK K band luminosity
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Dec-2015