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- W2022269079 abstract "view Abstract Citations (554) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-ray studies of quasars with the Einstein Observatory II. Zamorani, G. ; Henry, J. P. ; Maccacaro, T. ; Tananbaum, H. ; Soltan, A. ; Avni, Y. ; Liebert, J. ; Stocke, J. ; Strittmatter, P. A. ; Weymann, R. J. ; Smith, M. G. ; Condon, J. J. Abstract X-ray observations of 107 quasars have been carried out with the Einstein Observatory, and 79 have been detected. A correlation between optical emission and X-ray emission is found; and for radio-loud quasars, the data show a correlation between radio emission and X-ray emission. For a given optical luminosity, the average X-ray emission of radio-loud quasars is about three times higher than that of radio-quiet quasars. The data also suggest that the ratio of X-ray to optical luminosity is decreasing with increasing redshift and/or optical luminosity. The data support the picture in which luminosity evolution, rather than pure density evolution, describes the quasar behavior as a function of redshift. Publication: The Astrophysical Journal Pub Date: April 1981 DOI: 10.1086/158815 Bibcode: 1981ApJ...245..357Z Keywords: Cosmology; Heao 2; Quasars; Spaceborne Astronomy; X Ray Sources; Astronomical Models; Background Radiation; Light Emission; Luminosity; Red Shift; Tables (Data); Astronomy full text sources ADS | data products SIMBAD (99) NED (89) Related Materials (3) Part 1: 1979ApJ...234L...9T Part 3: 1983ApJ...268...60T Part 4: 1987ApJ...313..596W" @default.
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- W2022269079 date "1981-04-01" @default.
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- W2022269079 title "X-ray studies of quasars with the Einstein Observatory. II" @default.
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