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J/AJ/119/1562       gri photometry of 48 galaxy clusters    (Margoniner+, 2000)
Photometric properties of 48 clusters of galaxies. I. The Butcher-Oemler effect
    Margoniner V. E., de Carvalho R. R.
   <Astron. J. 119, 1562 (2000)>
   =2000AJ....119.1562M
ADC_Keywords: Clusters, galaxy ; Photometry, CCD

Keywords: galaxies: clusters: general - galaxies: evolution - galaxies:
          fundamental parameters - galaxies: photometry

Abstract:
    We present gri CCD photometry of 44 Abell clusters and four cluster
    candidates. Twenty-one clusters in our sample have spectroscopic
    redshifts. Fitting a relation between mean g, r, and i magnitudes and
    redshift for this subsample, we have calculated photometric redshifts
    for the remainder with an estimated accuracy of approximately 0.03.
    The resulting redshift range for the sample is 0.03 < z < 0.38.
    Color-magnitude diagrams are presented for the complete sample and
    used to study evolution of the galaxy population in the cluster
    environment.

Description:
    We obtained CCD images of 48 clusters in four runs between 1997 March
    and 1998 November. All data were taken with the Tek 2K-3 detector at
    the Cassegrain focus of the 0.9 m telescope at the Cerro Tololo
    Inter-American Observatory (CTIO). The CCD has 2048x2048 pixels, each
    pixel covering 0.396'', corresponding to a field of approximately
    13.5x13.5 or about 0.5-6.7 Mpc at z=0.03-0.38 (H0 = 67 km.s-1.Mpc-1). 
    We observed 44 Abell clusters and four cluster
    candidates detected in POSS-II (Second Palomar Sky Survey; Gal et al.
    2000AJ....119...12G) photographic plates. The images were taken
    through the g, r and i filters of the Thuan & Gunn
    (1976PASP...88..543T) photometric system, with effective wavelengths
    and widths of 5118 and 900 Å for g, 6798 and 1000 Å for r, and
    8100 and 1500 Å for i. The exposure times varied between 15-60
    minutes in the g band, 10-20 minutes in the r band, and 10-15 minutes
    in the i band.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        74    19492   Galaxy catalogs and gri photometry


See also:
   VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
   J/A+AS/103/245 : Gunn gri photometry of Clusters of Galaxies (Molinari+ 1994)
   J/A+AS/119/391 : Gunn photometry of seven clusters of galaxies
                    (Molinari+ 1996)


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1- 10  A10   ---     Name      Galaxy name
  12- 15  I4    yr      Obs.Y     Year of observation
  17- 19  A3    "month" Obs.M     Month of observation
  21- 22  I2    d       Obs.D     Day of observation
  26- 27  I2    h       RAh       Right Ascension (J2000)
  29- 30  I2    min     RAm       Right Ascension (J2000)
  32- 36  F5.2  s       RAs       Right Ascension (J2000)
      40  A1    ---     DE-       Sign of the Declination (J2000)
      41  I1    deg     DEd       Declination (J2000)
  43- 44  I2    arcmin  DEm       Declination (J2000)
  46- 50  F5.2  arcsec  DEs       Declination (J2000)
  54- 58  F5.2  mag     gmag      The g band aperture magnitude
  62- 66  F5.2  mag     rmag      The r band aperture magnitude
  70- 74  F5.2  mag     imag      The i band aperture magnitude


History:
    From AJ electronic edition
(End)                                          Greg Schwarz [AAS]    18-Apr-2000