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X-ray studies of quasars with the Einstein Observatory. IIX-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.
Document ID
19810050773
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/158815
Authors
Zamorani, G. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Maccacaro, T. (Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.; CNR, Istituto di Radioastronomia Bologna, Italy)
Henry, J. P. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Tananbaum, H. (Harvard-Smithsonian Center for Astrophysics Cambridge, Mass., United States)
Soltan, A. (Polska Akademia Nauk Centrum Astronomiczne, Warsaw, Poland)
Liebert, J. (Weizmann Institute of Science Rehovot, Israel)
Stocke, J. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Strittmatter, P. A. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Weymann, R. J. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Smith, M. G. (Steward Observatory Tucson, Ariz., United States)
Date Acquired
August 11, 2013
Publication Date
April 15, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astronomy
Accession Number
81A35177
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
Distribution Limits
Public
Copyright
Other

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