J/A+A/342/1 ESO Slice Project. VI. Groups of Galaxies. (Ramella+ 1999)
The ESO Slice Project (ESP) galaxy redshift survey: VI. Groups of Galaxies.
Ramella M., Zamorani G., Zucca E., Stirpe G.M., Vettolani G.,
Balkowski C., Blanchard A., Cappi A., Cayatte V., Chincarini G.,
Collins C., Guzzo L., MacGillivray H., Maccagni D., Maurogordato S.,
Merighi R., Mignoli M., Pisani A., Proust D., Scaramella R.
<Astron. Astrophys. 342, 1 (1999)>
=1999A&A...342....1R 1999A&A...342....1R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Radial velocities ; Velocity dispersion
Keywords: Galaxies: clusters: general ; distances and redshifts ;
luminosity function, mass function - cosmology: observations -
large-scale structure of the Universe
Description:
In Table 1 we present our group catalog. For each group we list the ID
number (column 1), the number of members (column 2), the coordinates
α(1950) and δ(1950) (columns 3 and 4 respectively),
the mean radial velocity cz in km/s corrected for Virgo infall and
galactic rotation (column 5), and the velocity dispersion σcz
(column 6). We compute the velocity dispersion following the
prescription of Ledermann (1984) for an unbiased estimator of the
dispersion (see previous section). We also take into account the
cosmological expansion of the universe and the measurement errors
according to the prescriptions of Danese et al. (1980A&A....82..322D 1980A&A....82..322D).
The errors we associate to the redshifts are those output by the RVSAO
cross-correlation procedure multiplied by a factor 1.6. This factor
brings the cross-correlation error in rough agreement with the
external error estimated from repeated observations
(Vettolani et al., 1998, Cat. J/A+AS/130/323 -- here we do not
distinguish between emission and absorption line redshifts).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 42 231 ESP groups
table1.ps 72 626 PostScript version of table1
table1.tex 125 184 LaTeX version of table1
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See also:
J/A+AS/130/323 : ESO Slice Project (Vettolani+ 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Groups Groups identification number
5- 6 I2 --- Nmem Number of members
8- 9 I2 h RAh Right ascension (1950)
11- 12 I2 min RAm Right ascension (1950)
14- 15 I2 s RAs Right ascension (1950)
17 A1 --- DE- Declination sign
18- 19 I2 deg DEd Declination (1950)
21- 22 I2 arcmin DEm Declination (1950)
24- 25 I2 arcsec DEs Declination (1950)
27- 31 I5 km/s cz Mean radial velocity
33 A1 --- l_sigma limit flag on sigma (1)
34- 36 I3 km/s sigma Velocity dispersion
38- 41 F4.2 --- Nocz Ratio of galaxies that have not a measured
redshift to the number of members (2)
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Note (1): In the case of 24 groups, the correction of σcz for the
measurement errors leads to a negative value. The error is given
as an upper limit to σcz for these groups.
Note (2): Not all galaxies in the region of the sky covered by the ESP survey
have a measured redshift. Of the original target list, 444 objects
are not observed, and 207 objects have a noisy spectrum, insufficient
for a reliable determination of the redshift. Nocz value gives, for
each group, the ratio of these objects to the number of members.
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Acknowledgements: Massimo Ramella
References:
Vettolani et al., Paper I. 1997A&A...325..954V 1997A&A...325..954V
Zucca et al., Paper II. 1997A&A...326..477Z 1997A&A...326..477Z
Vettolani et al., Paper III. 1998A&AS..130..323V 1998A&AS..130..323V, Cat. J/A+AS/130/323
Cappi et al., Paper IV. 1998A&A...336..445C 1998A&A...336..445C
Scaramella et al. Paper V. 1998A&A...334..404S 1998A&A...334..404S
(End) Patricia Bauer [CDS] 16-Nov-1998