Luminosity functions of 10 nearby clusters of galaxies. I. Data

Wide field CCD imaging was carried out in the R-C band for 10 nearby clusters of galaxies and four control fields to derive the total and type-specific luminosity functions. Observation and data reduction procedures are described. We extract galaxies down to R-C similar to 20 mag and classify them into two broad types, r(1/4)-like and exponential-like, on the basis of the bulge-to-total luminosity ratio B/T estimated from Petrosian quantities. We describe our classification scheme in detail. We apply a single classification scheme to both giant and dwarf galaxies. The consistency of our classification is verified for giant galaxies using both simulated images and real data in the literature. We set the boundary of our two types at B/T = 0.35. This boundary gives 70% completeness to both the r(1/4)-like sample (for E/S0 galaxies) and the exponential-like sample ( for Sa-Irr galaxies). Our classification for dwarf galaxies is investigated using higher resolution images of some 20 dwarf galaxies in the Virgo Cluster. Galaxy catalogs are constructed, which include position, magnitude, and B/T. The projected sky distribution of each type of galaxies is shown for the clusters and control fields.