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VII/159     Catalogue of galaxies towards the Coma Supercluster (Slezak+ 1988)
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Study of a field in the Coma Supercluster. I. Automated galaxies count
     Slezak E., Mars G., Bijaoui A., Balkowski C., Fontanelli P.
    <Astron. Astrophys. Suppl. Ser. 74, 83 (1988)>
    =1988A&AS...74...83S
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ADC_Keywords: Clusters, galaxy
Keywords: galaxies: clusters: individual (Coma) - 
          image processing in astronomy - galaxy count -
          Schmidt plate analysis

Description:
    The existence of a filament of galaxies was shown by Fontanelli
    (1984) in the Coma cluster region. This paper concerns the study of
    a IIIaJ Palomar Schmidt plate of the Eastern end of this filament.
    We have developed a real time reduction technique, quite similar to
    that used for the COSMOS machine and performed, in real time, an
    image segmentation. The galaxy selection was made using a classical
    Bayesian classification based on the diagram of the integrated
    density versus the area. All the non-stellar objects were thus
    identified using the PDS and a morphological type was attributed
    to the galaxies. Our catalogue gives coordinates, magnitudes
    (derived from the Zwicky et al. (1961-68) and Nilson (1973)
    catalogues), area in pixels, and morphological types for 7582
    galaxies. A histogram of all the galaxy magnitudes shows that the
    catalogue is apparently complete down to about the 19th magnitude.
    The asymmetry in the distribution of the bright objects between the
    North-West and the South-East part of the plate found by Fontanelli
    (1984) is also present for the fainter objects of our catalogue. We
    have identified galaxy condensations using an image segmentation on
    the galaxy density map. The parameters, position, axis, and
    orientation of these condensations have been estimated.


File Summary:
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 FileName      Lrecl     Records      Explanations
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ReadMe            80           .      This file
catalog.dat       64        7582     *Galaxies towards the Coma Supercluster
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Note on catalog.dat: only the 1199 galaxies brighter than 18.0
     (i.e. with a non-zero number in the first column) are
     published in the Table 1 of the paper.
     The column "Area in pixels" is not recorded here.
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Byte-by-byte Description of file: catalog.dat
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   Bytes  Format    Units    Label    Explanations
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   1-  5   I5       ---      NmB18    [0,1199]?=0 Object number for the galaxies
                                        brighter than the 18th magnitude
                                        (otherwise 0).
   7- 11   I5       ---      N        [1,7582]+ Object number
  15- 16   I2       h        RAh      [13] right ascension (hours)   (J2000)
  18- 19   I2       min      RAm      [13,42]+= right ascension (minutes)
  21- 25   F5.2     s        RAs      [0,60.0] right ascension (seconds)
      28   A1       ---      DE-      [ ] declination sign
  29- 30   I2       deg      DEd      declination (degrees)     (J2000)
  32- 33   I2       arcmin   DEm      declination (minutes)
  35- 39   F5.2     arcsec   DEs      declination (seconds)
  44- 49   F6.3     mag      Bmag     B magnitude
  52- 62   A11      ---      MType    morphological type
  63- 64   A2       ---      Note     [ *v] SIMBAD or velocity note (1)
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Note (1): the symbol is:
      '*' = object with identification in SIMBAD (Strasbourg Data Center).
      'v' = object with a known radial velocity.
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History:
    The catalogue was provided by courtesy of E. Slezak to H. Andernach;
    it was numbered A100 in H. Andernach's "List of Astronomical Catalogues
    and Documents kindly provided on request by various authors"
  01-Oct-1993: First archived.
  12-Jan-1994: "Intro" file has been slightly rewritten.
     (The date of the latest archive, see the date of each file.)
  08-Aug-1997: this documentation has been standardized at CDS
     (Francois Ochsenbein)

References:
    Zwicky, F., Herzog, E., Wild, P., Karpowicz, M., and Kowal C.T. 1961-68,
    Catalogue of Galaxies and of Clusters of Galaxies, I-VI (Pasadena,
    California Institute of Technology) (catalogs <VII/4>, <VII/190>)
    Nilson, P. 1973, Uppsala Ann. 6 (catalog <VII/26>)
    Fontanelli, P. 1984A&A...138...85F
    Slezak E., Bijaoui A., Mars G., 1988A&A...201....9S (Paper II)
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(End)                                        Koichi Nakajima [CDS]   27-Sep-1993