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VII/86A Groups of Galaxies. I. Nearby Groups (Huchra+ 1982)
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Groups of Galaxies. I. Nearby Groups
Huchra J.P., Geller M.J.
<Astrophys. J. 257, 423 (1982)>
=1982ApJ...257..423H
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ADC_Keywords: Clusters, galaxy ; Galaxy catalogs
Keywords: cosmology; observations - galaxies: clusters: general -
galaxies: distances and 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
groups.dat 64 92 Group Parameters (from Table 5)
crossid.dat 40 32 Comparison with de Vaucouleurs (from Table 4)
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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
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Bytes Format Units Label Explanations
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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)
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Byte-by-byte Description of file: crossid.dat
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Bytes Format Units Label Explanations
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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
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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)
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(End) Joseph Florsch, Francois Ochsenbein [CDS] 18-Sep-1996