J/ApJ/569/720 Mass-to-light ratio of galaxy systems (Girardi+, 2002)
Observational mass-to-light ratio of galaxy systems from poor groups to
rich clusters.
Girardi M., Manzato P., Mezzetti M., Giuricin G., Limboz F.
<Astrophys. J. 569, 720 (2002)>
=2002ApJ...569..720G 2002ApJ...569..720G
ADC_Keywords: Clusters, galaxy ; Velocity dispersion
Keywords: cosmology: observations - galaxies: clusters: general -
galaxies: fundamental parameters
Abstract:
We study the mass-to-light ratio of galaxy systems from poor groups to
rich clusters and present for the first time a large database for
useful comparisons with theoretical predictions. We extend a previous
work, where Bj band luminosities and optical virial masses were
analyzed for a sample of 89 clusters. Here we also consider a sample
of 52 more clusters, 36 poor clusters, seven rich groups, and two
catalogs, of ∼500 groups each, recently identified in the Nearby
Optical Galaxy sample by using two different algorithms. We obtain the
blue luminosity and virial mass for all systems considered. We devote
a large effort to establishing the homogeneity of the resulting
values, as well as to considering comparable physical regions, i.e.,
those included within the virial radius.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 71 43 Results of Dynamical Analysis
table3.dat 91 162 Luminosity Estimates
table4.dat 85 6 Results for Nearby Optical Galaxy (NOG) Groups
table5.dat 20 294 M/L Values for the Combined Sample
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 -- Name System name
10- 12 I3 --- Nf Number of galaxies with measured redshift
in each cluster field
14- 16 I3 --- Nm Number of member galaxies after checking
with velocity dispersion profile and used
to compute Vel and sigma
18- 22 I5 km/s Vel Mean velocity
24- 26 I3 km/s sigma Global line-of-sight velocity dispersion
28- 30 I3 km/s E_sigma Error in velocity dispersion (upper limit)
32- 34 I3 km/s e_sigma Error in velocity dispersion (lower limit)
36- 39 F4.2 Mpc Rvir Virial radius which defines the region of
dynamical equilibrium (in h-1.Mpc)
41- 42 I2 --- N Number of member galaxies within Rvir
44- 47 F4.2 Mpc RPV Projected radius used in the virial theorem
and here computed within Rvir
(in h-1.Mpc)
49- 52 F4.2 Mpc e_RPV rms uncertainty on RPV
53 A1 --- n_RPV [)] ): Value computed through the
alternative estimate by using the typical
galaxy distribution (see text)
55 A1 --- Type [ABC] Velocity dispersion profile type (1)
57- 60 F4.2 10+14solMass Mass Viral mass contained within Rvir after
pressure surface term correction
(in h-1.1014M☉)
62- 65 F4.2 10+14solMass E_Mass Error in mass (upper limit)
67- 70 F4.2 10+14solMass e_Mass Error in mass (lower limit)
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Note (1): Type of velocity dispersion profile:
A: fully isotropical with a radial component only in external regions
B: fully isotropical
C: fully isotropical with a circular component in central regions
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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- 9 A9 --- Name System name
11- 12 I2 h RAh System center Right Ascension (J2000)
14- 15 I2 min RAm System center Right Ascension (J2000)
17- 20 F4.1 s RAs System center Right Ascension (J2000)
22 A1 --- DE- System center Declination sign (J2000)
23- 24 I2 deg DEd System center Declination (J2000)
26- 27 I2 arcmin DEm System center Declination (J2000)
29- 30 I2 arcsec DEs System center Declination (J2000)
32- 35 F4.2 Mpc Rvir Virial radius in units of h-1 Mpc
37- 40 I4 --- NAPS ? Number of APS galaxies within Rvir
42- 46 F5.2 10+11solLum LBjcA ? APS BJ band luminosity estimate using
mean field counts for the fore/background
correction (1)
48- 52 F5.2 10+11solLum LBjfA ? APS BJ band luminosity estimate using
the member fraction for the fore/background
correction(1)
54- 58 F5.2 10+11solLum LBjmfA ? APS Bjband luminosity estimate using the
median member fraction for the
fore/background correction (1)
60- 63 I4 --- NCOS ? Number of COSMOS galaxies within Rvir
65- 69 F5.2 10+11solLum LBjcC ? COSMOS BJ band luminosity estimate using
mean field counts for the fore/background
correction (2)
71- 75 F5.2 10+11solLum LBjfC ? COSMOS BJ band luminosity estimate using
the member fraction for the fore/background
correction (2)
77- 80 F4.2 10+11solLum LBjmfC ? COSMOS Bjband luminosity estimate using
the median member fraction for the
fore/background correction (2)
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Note (1): In units of 1011 solar BJ band luminosity times h-2.
Note (2): We report values computed by Girardi & Giuricin (2000ApJ...540...45G 2000ApJ...540...45G)
for clusters (C-CL sample), too.
In units of 1011 solar BJ band luminosity times h-2.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Cat Sample name
5- 7 I3 --- Ng Number of groups
9- 10 I2 --- Nm Median value for the number of member
galaxies
12- 15 F4.2 Mpc Rmax Group size (in h-1.Mpc) (1)
17- 19 F3.2 Mpc E_Rmax Error in Rmax (upper limit)
21- 23 F3.2 Mpc e_Rmax Error in Rmax (lower limit)
25- 27 I3 km/s sigma line-of-sight velocity dispersion
29- 30 I2 km/s E_sigma Error in sigma (upper limit)
32- 33 I2 km/s e_sigma Error in sigma (lower limit)
35- 38 F4.2 Mpc RPV Projected radius used in the virial
theorem (in h-1.Mpc)
40- 42 F3.2 Mpc E_RPV Error in RPV (upper limit)
44- 46 F3.2 Mpc e_RPV Error in RPV (lower limit)
48- 51 F4.2 10+13solMass Mass Virial mass, before correction for the
dynamical status
53- 55 F3.2 10+13solMass E_Mass Error in Mass (upper limit)
57- 59 F3.2 10+13solMass e_Mass Error in Mass (lower limit)
61- 64 F4.2 10+13solMass MassCor Virial mass, after correction for the
dynamical status
66- 68 F3.2 10+13solMass E_MassCor Error in MassCor (upper limit)
70- 72 F3.2 10+13solMass e_MassCor Error in MassCor (lower limit)
74- 77 F4.2 10+11solLum LBtot Total blue luminosity (2)
79- 81 F3.2 10+11solLum E_LBtot Error in LBtot (upper limit)
83- 85 F3.2 10+11solLum e_LBtot Error in LBtot (lower limit)
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Note (1): Projected distance of the most distant galaxy from the group center,
here computed as the biweight center
Note (2): In units of 1011 solar BJ band luminosity times h-2.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name System name
11- 15 F5.2 [solMass] Log(M) Log of the system mass relative to solar
17- 20 I4 [Sun] Log(M/L) Log of the system mass to BJ band
luminosity ratio relative to solar
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 25-Jun-2002