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VII/86A     Groups of Galaxies. I. Nearby Groups   (Huchra+ 1982)

Groups of Galaxies. I. Nearby Groups Huchra J.P., Geller M.J. <Astrophys. J. 257, 423 (1982)> =1982ApJ...257..423H
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs Keywords: cosmology - galaxies: clusters of - galaxy: redshifts Description: The catalog contains nearby groups of galaxies with outer number density enhancement greater than 20. The groups were searched using a whole sky catalog of 1312 galaxies brighter than mag 13.2 (B) with complete redshift information (Huchra et al. =1983ApJS...52...89H). Only groups containing more than two members are included. The catalogue includes equatorial coordinates, average radial velocities, and velocity dispersions for 92 nearby groups in the first file. A second file contains the results of a comparison between this catalog and de Vaucouleurs' (1975) catalog of nearby groups The Hubble constant was assumed 100km/s/Mpc. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file groups.dat 64 92 Group Parameters (from Table 5) crossid.dat 40 32 Comparison with de Vaucouleurs (from Table 4)
See also: VII/84 : Groups of Galaxies. III. (Geller & Huchra, 1983) VII/164 : The CfA Redshift Catalogue, Version Nov. 1993 (Huchra+, 1993) Byte-by-byte Description of file: groups.dat
Bytes Format Units Label Explanations
1- 3 I3 --- HGnum [1/92]+ Group running number 5- 7 I3 --- Ngal Number of Galaxies composing this group 9- 10 I2 h RAh Right Ascension (1950) hours 11- 14 F4.1 min RAm RA in minutes 16 A1 --- DE- Sign of Declination 17- 18 I2 deg DEd Declination (1950) in degrees 19- 20 I2 arcmin DEm DEC in arcminutes 22- 25 I4 km/s GCvel Mean flow-corrected galactocentric velocity 27- 30 I4 km/s Vdisp Line-of-sight velocity dispersion 32- 35 F4.1 mag GrpMag Integrated group magnitude 37- 40 F4.2 --- H*xTime Crossing time in units of 1/H (Eq. 16) 42- 45 F4.2 Mpc Mradius Mean harmonic radius (Eq. 13) 47- 50 F4.2 Mpc Msep Mean pairwise separation (Eq. 14) 52- 59 E8.2 solMass Mgrp Mass of the group (Eq. 15) 61- 64 I4 Sun M/L Mass/Luminosity ratio (Eq. 15)
Byte-by-byte Description of file: crossid.dat
Bytes Format Units Label Explanations
1- 20 A20 --- DVnum de Vaucouleurs (1975) group number(s) 22- 26 A5 --- HGnum Group(s) from this paper 29- 40 A12 --- Names Other names of the group
History: The catalogue was prepared at CDS; the first version contained only columns 1-7 of the Table 5 (file groups.dat). The missing columns were added in September 1996 at CDS. The description is from Nancy G. Roman at ADC. References: Huchra, J.P., Davis, M., Latham, D., and Tonry, J. 1982, ApJS, 52, 89 de Vaucouleurs, G. 1975, in Galaxies and the Universe, eds. A. Sandage, M. Sandage, and J. Kristian (Chicago: University of Chicago Press)
(End) Joseph Florsch, Francois Ochsenbein [CDS] 18-Sep-1996
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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