Photometric Catalogs of Four EMSS Poor Clusters of Galaxies

Abstract

We have used the 2.3-meter Vainu Bappu Telescope to perform CCD imaging of X-ray-selected poor clusters of galaxies. Our sample consists of four X-ray luminous clusters in the Einstein Observatory Extended Medium Sensitivity Survey (EMSS) and noted by Gioia & Luppino (1994) to be optically less rich than Abell clusters. The sample spans a redshift range of 0.08:,$ z :,$0.22. We have assembled catalogs of galaxies detected in the cluster fields to a magnitude limit mv ~ 22. This paper describes the data reduction performed on the CCD images, the methods used to construct the extended object catalogs, the photometric calibrations, and some understanding of their completeness and contamination.