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VII/84A Groups of Galaxies. III. The CfA Survey (Geller, Huchra 1983)
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Groups of Galaxies. III. The CfA Survey
Geller M.J., Huchra J.P.
<Astrophys. Journ. Suppl. 52, 61 (1983)>
=1983ApJS...52...61G
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ADC_Keywords: Surveys; Galaxy catalogs
Description:
The catalog contains statistically homogeneous groups of galaxies
based on the Harvard-Smithsonian Center for Astrophysics (CFA)
redshift survey. Groups in the catalog are all density enhancements
in redshift space of a factor greater than 20. All groups contain
at least three members. There are 176 groups in the catalog and 102
groups have been identified in one or more previous studies. The
catalog includes group numbers, numbers of members, equatorial
coordinates, mean flow-corrected galactocentric velocities,
line-of-sight-velocity dispersion, integrated group magnitudes,
crossing times for the groups, and mean harmonic radii of the
groups.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 176 CfA redshift survey data for 176 galaxy groups
table3.dat 38 196 Comparing this catalog against 3 earlier ones
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- GrpNum Group running number
4- 7 I4 --- NumGal Number of Galaxies composing this group
8- 10 I3 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
21- 25 I5 km/s GCvel *GC velocity
26- 30 I5 km/s Vdisp *LOS vel. disp.
31- 35 F5.1 mag GrpMag Integrated group magnitude
36- 40 F5.2 H/s CrsTime *Crossing time
41- 45 F5.2 Mpc Mradius *Mean harmonic radius
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Note on GCvel:
Mean flow-corrected galactocentric velocity in km/sec.
Note on Vdisp:
Line-of-sight velocity dispersion, uncorrected for measurement error, in
km/sec.
Note on CrsTime:
Crossing time of the group in units of 1/H. This field was mislabeled in
Geller and Huchra (1983) (see History).
Note on Mradius:
Mean harmonic radius of the group as defined by equation (13) of Huchra
and Geller (1982), in Mpc. This field was mislabeled in Geller and
Huchra (1983) (see Remarks and Modifications).
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- GrpNum Catalog number of the group
5- 9 A5 --- TGnum *TG number(s)
11- 12 I2 --- NBnum ? Corresponding NB group number
15- 16 I2 --- DVnum ? Corresponding DV group number
20- 38 A19 --- Alias Other names of groups in this cluster
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Note on TGnum:
Corresponding TG group, if any. This may be a range; for example, 50-57
for GOGIII group 94.
Remarks and Modifications:
The (GOGIII) was received by the Astronomical Data Center (ADC), NASA
Goddard Space Flight Center, from the Centre de Donnees Astronomiques,
Strasbourg (CDS), in December 1986.
The original tape consisted of two text files of data from Tables 1 and
3 in the published catalog Huchra and Geller (1982). Blank columns were
removed from Table 1 using an editor to reduce the record size from 54
to 45 bytes. The character "-", used in Table 3 to indicate no data, was
changed to a blank, so that most of the fields could be read with a
FORTRAN integer format. No other changes were made in either file.
A FORTRAN program was run to check the validity of each field according
to its data type and value.
In the original published catalog (Geller and Huchra 1983) the crossing
time and mean harmonic radius fields were mislabeled (erratum, Geller
and Huchra 1984). We wish to thank J. P. Huchra for bringing this to our
attention.
The second file, table3.dat, contains a table comparing the present
catalog against three earlier catalogs: DV = de Vaucouleurs (1975);
NB = Huchra and Geller (1982); TG = Turner and Gott (1976)
Acknowledgements:
The original ADC documentation by Anne C. Raugh (1987) was used to
create this ReadMe file.
References:
Geller, M. J. and Huchra, J. P. 1983, Astrophys. J. Suppl. Ser., 52, 61-87.
Geller, M. J. and Huchra, J. P. 1984, Astrophys. J. Suppl. Ser., 54, 442.
Huchra, J. P. and Geller, M. J. 1982, Astrophys. J., 257, 423.
Turner, E. L. and Gott, J. R. 1976, Astrophys. J. Suppl. Ser., 32, 409.
de Vaucouleurs, G. 1975, in Stars and Stellar Systems, Galaxies and the
Universe, Vol. 9, ed. A. Sandage, M. Sandage, and J. Kristian
(Chicago: University of Chicago Press), p. 557.
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(End) C.-H. Joseph Lyu [Hughes STX/NASA] 12-Dec-1995