AN EINSTEIN X-RAY SURVEY OF OPTICALLY SELECTED GALAXIES .1. DATA

We present the results of a complete Einstein imaging proportional cou nter X-ray survey of optically selected galaxies from the Shapley-Ames Catalog, the Uppsala General Catalogue, and the European Southern Obs ervatory Catalog. Well-defined optical criteria are used to select the galaxies, and X-ray fluxes are measured at the optically defined posi tions. The result is a comprehensive list of X-ray detection and upper limit measurements for 1018 galaxies. Of these, 827 have either indep endent distance estimates or radial velocities. Associated optical, re dshift, and distance data have been assembled for these galaxies, and their distances come from a combination of directly predicted distance s and those predicted from the Faber-Burstein Great Attractor/Virgocen tric infall model. The accuracy of the X-ray fluxes has been checked i n three different ways; all are consistent with the derived X-ray flux es being of less than or equal to 0.1 dex accuracy. In particular, the re is agreement with previously published X-ray fluxes for galaxies in common with a 1991 study by Roberts et al. and a 1992 study by Fabbia no et al. The data presented here will be used in further studies to c haracterize the X-ray output of galaxies of various morphological type s and thus to enable the determination of the major sources contributi ng to the X-ray emission from galaxies.