========================================================================== J/AJ/119/1562 gri photometry 48 galaxy clusters (Margoniner+, 2000) The following files can be converted to FITS (extension .fit .fgz or .fiZ) table3.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/cgi-bin/VizieR?-source=J/AJ/119/1562 ==========================================================================
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Beginning of ReadMe : 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 (H_0_ = 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 AA for g, 6798 and 1000 AA for r, and 8100 and 1500 AA 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.