Access to Astronomical Catalogues

J/A+AS/100/47          Lyon Groups of Galaxies           (Garcia 1993)
General study of group membership. II. Determination of nearby groups.
     Garcia A.M.
    <Astron. Astrophys. Suppl. Ser. 100, 47 (1993)>
    =1993A&AS..100...47G
ADC_Keywords: Clusters, galaxy ;

Keywords: galaxies: clustering - numerical methods - catalogs


Description:
    The catalog of nearby groups of galaxies was created from the sample
    of galaxies complete up to the limiting apparent magnitude Bo=14.0
    with a recession velocity smaller than 5500km/s. Two methods were used
    in group construction: a percolation method derived from Huchra and
    Geller (1982ApJ...257..423H) and a hierarchical method initiated by
    Tully (1980ApJ...237..390T). The catalog presented here is a
    synthesized version of the two results.

Remark:
    A few differences exist compared to the printed version:
    these are small errors which have been corrected by the author
    (April 1994)

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        93      485   Group data
table2.dat        55     3933   Membership of nearby galaxies


Byte-by-byte Description of file: table1.dat

   Bytes Format  Units   Label    Explanations

   1-  3  I3     ---     LGG      [1,485] Group number (Lyon Group of Galaxies)
   6- 18  A13    ---     Name     Group identification with the name of
                                    the brightest galaxy in the group
  20- 21  I2     ---     Ngal     Number of galaxies in the group
  24- 25  I2     h       RAh      Right Ascension 1950 (hours)
  26- 27  I2     min     RAm      Right Ascension 1950 (minutes)
  28- 31  F4.1   s       RAs      Right Ascension 1950 (seconds)
      32  A1     -       DE-      Declination 1950 (sign)
  33- 34  I2     deg     DEd      Declination 1950 (degrees)
  35- 36  I2     arcmin  DEm      Declination 1950 (minutes)
  37- 38  I2     arcsec  DEs      Declination 1950 (seconds)
  41- 44  I4     km/s    RV       Luminosity-weighted mean radial velocity
  47- 59  A13    ---     Fouque   Cross-identification with Fouque et al.
                                    (1992A&AS...93..211F)
  60- 71  A12    ---     GH/HG    Cross-identification with Geller & Huchra
                                    (1983ApJS...52...61G) and Huchra & Geller
                                    (1982ApJ...257..423H)
  72- 85  A14    ---     Tully    Cross-identification(s) with Tully (1987,
                                    Sat. VII/145)
  86- 93  A8     ---     MCL      Cross-identification with Maia et al.
                                    (1989ApJS...69..809M) or other


Byte-by-byte Description of file: table2.dat

   Bytes Format  Units   Label    Explanations

   1-  3  A3     ---     ---      [LGG] Catalog acronym (Lyon Group of Galaxies)
   5-  7  I3     ---     LGG      [1,485] Group number
   9- 11  A3     ---     ---      [PGC] Acronym of Principal Galaxies Catalog
  12- 16  I5     ---     PGC      PGC number according to
                                     Paturel et al. 1989a,b) (1)
  18- 29  A12    ---     Other    Identification with an alternative name
  31- 32  I2     h       RAh      Right ascension 1950
  33- 34  I2     min     RAm      Right ascension 1950
  35- 38  F4.1   s       RAs      Right ascension 1950
      39  A1     ---     DE-      Declination sign
  40- 41  I2     deg     DEd      Declination 1950
  42- 43  I2     arcmin  DEm      Declination 1950
  44- 45  I2     arcsec  DEs      Declination 1950
      47  A1     ---     T        Morphological type coded according to RC3,
                                    when it is known (2)
  49- 52  I4     km/s    Vel      Mean heliocentric radial velocity
  53- 54  A2     ---     Note     [*P*H+ ] (3)

Note (1): Paturel et al. 1989a, 1989A&AS...80..299P, Cat. VII/119
          Paturel et al. 1989b, Extragalactic Data Base Monographs 1,
           Vol. 1, 2, 3 (PGC), Cat. VII/119
Note (2): de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright
     Galaxies (New York: Spinger Verlag) Vol. I, II, III (RC3), Cat. VII/155
Note (3): the flag has the following meaning:
     '*P' when given from the percolation method only,
     '*H' when given from the hierarchical method only,
     '+' for galaxies added afterwards


References:
      Garcia et al., Paper I, 1993A&AS...98....7G
(End)                                           Patricia Bauer [CDS] 17-Nov-1993