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Extragalactic x ray source countsExtragalactic x-ray source counts carry information about the luminosity function and cosmic evolution of galaxies, BL Lac objects, Seyfort galaxies, and quasars. We discuss two available x-ray source samples with complete optical identifications and redshifts. We find evidence for instrumental bias in the detection of clusters for cosmic evolution of quasars, and of absorption effects in low luminosity Seyfert galaxies. Modest spectral and density evolution of Seyfort galaxies would allow the soft x-ray background to be made up entirely of discrete sources. We present a source count prognosis for the Advanced X-ray Astrophysics Facility (AXAF) energy range 0.5 to 10 keV.
Document ID
19920003749
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Schmidt, Maarten
(California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: NAS-NRC, High-Energy Astrophysics. American and Soviet Perspectives
Subject Category
Astrophysics
Accession Number
92N12967
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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