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J/A+AS/103/245     Gunn gri photometry of Clusters of Galaxies  (Molinari+ 1994)
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Multicolor Photometry of Clusters of Galaxies: A3284, A3305 and A1942
     Molinari E., Banzi M., Buzzoni A., Chincarini G., Pedrana M.D.
    <Astron. Astrophys. Suppl. Ser. 103, 245 (1994)>
    =1994A&AS..103..245M
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ADC_Keywords: Clusters, galaxy; Photometry
Keywords: galaxies: evolution of - galaxies: clusters of - photometry


Abstract:
    We present complete multicolor photometry in the Gunn system for the three
    clusters of galaxies A3284, A3305 and A1942 at redshift z~0.2. INVENTORY
    magnitudes and colours have been obtained for over 1,000 objects in the
    three fields down to g=24, and with a good completeness level in the
    detections (85% or better) about one magnitude brighter. By fitting with
    King profiles the r counts we derived the total number of galaxies and the
    core radius down to the r magnitude limit in each cluster. These are
    N_TOT_=146 galaxies and R_c_=0.24 Mpc for A3284, N_TOT_=129 and R_c_=0.20
    Mpc for A3305, N_TOT_=130 and R_c_=0.24 Mpc for A1942. The observed mean
    redshift of the clusters is z=0.150+/-0.001 for A3284, z=0.157+/-0.001
    for A3305, and z=0.226+/-0.001 for A1942. The c-m diagrams and the g-i
    colour distribution as well as the two-colour diagrams are used to single
    out early-type galaxies and spirals on the basis of their different
    photometric properties. This approach aimed at a self-consistent
    classification of galaxies on the basis of photometric indicators will be
    further developed for a systematic study of the galaxy population in 
    distant clusters.

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table3          55        455    Photometric catalog of A3284
table4          55        281    Photometric catalog of A3305
table5          55        270    Photometric catalog of A1942
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Byte-by-byte Description of file: table3 table4 table5
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   Bytes Format  Units   Label    Explanations
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   3-  5  I3     ---     CN       Catalog number
   7- 12  F6.1   pix     x        x coordinate of the object
  14- 19  F6.1   pix     y        y coordinate of the object
  21- 25  F5.2   mag     gmag     [14,31]? g magnitude (Gunn system)
  27- 31  F5.2   mag     rmag     [14,30]? r magnitude (Gunn system)
  33- 37  F5.2   mag     imag     [14,30]? i magnitude (Gunn system)
  39- 43  F5.2   mag     g-r      [-0.8,3.1]? g-r color
  45- 49  F5.2   mag     g-i      [-0.8,3.1]? g-i color
  52- 55  F4.1   pix     Riso     ]0,20]? isophotal radius in the r magnitude
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(End)                                           Patricia Bauer [CDS] 25-Oct-1993