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J/AJ/109/1458 Neighborhoods of 36 loose groups of galaxies (Ramella+ 1995)
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The redshift-space neighbourhoods of 36 loose groups of galaxies. I. The data.
Ramella M., Geller M.J., Huchra J.P., Thorstensen J.R.
<Astron. J. 109, 1458 (1995)>
=1995AJ....109.1458R (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, optical; Positional data; Magnitudes; Radial velocities
Keywords: Galaxies: groups
Description:
We have selected 36 loose groups of galaxies from Ramella et al. 1989,
with at least five members, and with mean redshift cz>3200km/s. These
groups all lie within the first two "slices" of the CfA redshift
survey <VII/164> (RA between 8h and 17h, DE between 2655.5 and 38.5
degrees). For each of these groups, we define the "redshift-space
neighbourhood" as a region centered on the group coordinates and
delimited by a circle of projected radius 1.5xh^-1^ Mpc on the sky,
and by a velocity interval of 3000km/s.
Table 2 lists the positions, magnitudes, radial velocities (cz) and
their errors, for the members of the groups published in RGH89.
Coordinates and magnitudes are from Zwicky's CGCG <VII/4>. Unpublished
redshifts are marked with an asterisk in the last column.
Table 3 lists galaxies within 1.5Mpc (assuming H0=100) and +/-1500
km/s from the centers of the groups in redshift space. Magnitudes and
positions are from the Zwicky-Nielsen merged catalog. Some coordinates
are better coordinates than Zwicky's, some come from compilations of
redshift data that we have used to complement our measurements.
Unpublished redshifts are marked with an asterisk in the last column.
In this table some galaxies appear twice because a few groups do
overlap. We listed the galaxies in common under the labels of both
groups.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 42 232 The original group members in RGH89
table2.tex 80 455 plain TeX version of table2
table3.dat 42 381 Additional galaxies
table3.tex 80 683 plain TeX version of table3
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- RGH89 Group number (Table 5 from Ramella
et al, 1989)
5- 6 I2 h RAh Right Ascension 1950 (hours)
8- 9 I2 min RAm Right Ascension 1950 (minutes)
11- 14 F4.1 s RAs Right Ascension 1950 (seconds)
16 A1 --- DE- Declination 1950 (sign)
17- 18 I2 deg DEd Declination 1950 (degrees)
20- 21 I2 arcmin DEm Declination 1950 (minutes)
23- 24 I2 arcsec DEs Declination 1950 (seconds)
26- 30 F5.2 mag B(0) []? Magnitude in the Zwicky system
32- 36 I5 km/s cz Heliocentric velocity
38- 40 I3 km/s e_cz []?=0 Mean error on cz
42 A1 --- n_cz [*] The asterisk indicates a new measurement
(unpublished redshift)
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Courtesy:
Massimo Ramella <ramella@oat.ts.astro.it>
References:
Ramella M., Geller M.J., Huchra J.P. (RGH89) =1989ApJ...344...57R
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(End) Francois Ochsenbein [CDS] 21-Jul-1995