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Date and Time of the Query: 2019-04-25 T19:09:12 PDT
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For refcode 2007AJ....133..313A:
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Copyright by American Astronomical Society. Reproduced by permission
2007AJ....133..313A A Large, Uniform Sample of X-Ray-emitting Active Galactic Nuclei from the ROSAT All Sky and Sloan Digital Sky Surveys: The Data Release 5 Sample Scott F. Anderson, Bruce Margon, Wolfgang Voges, Richard M. Plotkin, David Syphers, Daryl Haggard, Matthew J. Collinge, Jillian Meyer, Michael A. Strauss, Marcel A. Agueeros, Patrick B. Hall, L. Homer, Zeljko Ivezic, Gordon T. Richards, Michael W. Richmond, Donald P. Schneider, Gregory Stinson, Daniel E. Vanden Berk, and Donald G. York Abstract. We describe further results of a program aimed at yielding ~10^4^ fully characterized optical identifications of ROSAT X-ray sources. Our program employs X-ray data from the ROSAT All Sky Survey (RASS) and both optical imaging and spectroscopic data from the Sloan Digital Sky Survey (SDSS). RASS/SDSS data from 5740 deg^2^ of sky spectroscopically covered in SDSS Data Release 5 provide an expanded catalog of 7000 confirmed quasars and other active galactic nuclei (AGNs) that are probable RASS identifications. Again, in our expanded catalog the identifications as X-ray sources are statistically secure, with only a few percent of the SDSS AGNs likely to be randomly superposed on unrelated RASS X-ray sources. Most identifications continue to be quasars and Seyfert 1 galaxies with 15<m<21 and 0.01<z<4, but the total sample size has grown to include very substantial numbers of even quite rare AGNs, e.g., it now includes several hundreds of candidate X-ray-emitting BL Lac objects and narrow-line Seyfert 1 galaxies. In addition to exploring rare subpopulations, such a large total sample may be useful when considering correlations between the X-ray and the optical and may also serve as a resource list from which to select the "best" object (e.g., X-ray-brightest AGN of a certain subclass at a preferred redshift or luminosity) for follow-up X-ray spectral or alternate detailed studies. Key words: Catalogs, Galaxies: Quasars: General, Surveys, X-rays
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