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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
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:
FileName Lrecl Records Explanations
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
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
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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 B_J_ band luminosity estimate using mean field counts for the fore/background correction (1) 48- 52 F5.2 10+11solLum LBjfA ? APS B_J_ band luminosity estimate using the member fraction for the fore/background correction(1) 54- 58 F5.2 10+11solLum LBjmfA ? APS B_j_band 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 B_J_ band luminosity estimate using mean field counts for the fore/background correction (2) 71- 75 F5.2 10+11solLum LBjfC ? COSMOS B_J_ band luminosity estimate using the member fraction for the fore/background correction (2) 77- 80 F4.2 10+11solLum LBjmfC ? COSMOS B_j_band luminosity estimate using the median member fraction for the fore/background correction (2)
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) for clusters (C-CL sample), too. In units of 1011 solar BJ band luminosity times h-2.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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)
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.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 25-Jun-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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