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J/A+A/342/1         ESO Slice Project. VI. Groups  of Galaxies.  (Ramella+ 1999)
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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      (SIMBAD/NED BibCode)
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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
    {alpha}_(1950)_ and {delta}_(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 {sigma}_cz_
    (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).
    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:
--------------------------------------------------------------------------------
 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 {sigma}_cz_ for the
           measurement errors leads to a negative value. The error is given
           as an upper limit to {sigma}_cz_ 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 <ramella@suw003.oat.ts.astro.it>

References:
    Vettolani et al., Paper I.   1997A&A...325..954V
    Zucca et al.,     Paper II.  1997A&A...326..477Z
    Vettolani et al., Paper III. 1998A&AS..130..323V, Cat. <J/A+AS/130/323>
    Cappi et al.,     Paper IV.  1998A&A...336..445C
    Scaramella et al. Paper V.   1998A&A...334..404S
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(End)                                         Patricia Bauer [CDS]   16-Nov-1998