Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389..491d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 20, 1992, p. 491-498. Research supported by ASI.
Astronomy and Astrophysics
Astronomy
52
Active Galactic Nuclei, Cosmology, Galactic Evolution, Luminosity, X Ray Sources, Quasars, Red Shift, Rosat Mission, X Ray Astronomy
Scientific paper
A detailed study of the cosmological properties of X-ray selected AGN is presented. The data are analyzed within the framework of a pure luminosity evolution (PLE) model and the two most population evolutionary forms. Evidence is found for luminosity-dependent luminosity evolution if the evolution function has the exponential form. The simpler PLE model is more acceptable if the data are fitted with a power-law evolution function. Similar results are obtained in the optical domain from an analysis of a sample of optically selected QSOs with z less than 2.2 and B less than 20.
della Ceca Roberto
Gioia Isabella Maria
Maccacaro Tommaso
Stocke John T.
Wolter Anna
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