Wilkes, BelindaTananbaum, HarveyWorrall, DianaAvni, YoramOey, M. S.Flanagan, Joan2017-02-131994Wilkes, Belinda J., Harvey Tananbaum, D. M. Worrall, Yoram Avni, M. S. Oey, and Joan Flanagan. 1994. “The Einstein Database of IPC x-Ray Observations of Optically Selected and Radio-Selected Quasars, 1.” The Astrophysical Journal Supplement Series 92 (May): 53. doi:10.1086/191959.0067-0049http://nrs.harvard.edu/urn-3:HUL.InstRepos:30212177We present the first volume of the Einstein quasar database. The database includes estimates of the X-ray count rates, fluxes, and luminosities for 514 quasars and Seyfert 1 galaxies observed with the Imaging Proportional Counter (IPC) aboard the Einstein Observatory. All were previously known optically selected or radio-selected objects, and most were the targets of the X-ray observations. The X-ray properties of the Active Galactic Nuclei (AGNs) have been derived by reanalyzing the IPC data in a systematic manner to provide a uniform database for general use by the astronomical community. We use the database to extend earlier quasar luminosity studies which were made using only a subset of the currently available data. The database can be accessed on internet via the SAO Einstein on-line system ('Einline') and is available in ASCII format on magnetic tape and DOS diskette.en-USJournal Article2017-02-1310.1086/191959