Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981cxrs.book.....p&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Galactic Radiation, Intergalactic Media, X Ray Astronomy, X Ray Spectra, Active Galactic Nuclei, Galactic Clusters, Maximum Likelihood Estimates, Radio Sources (Astronomy), Stellar Luminosity
Scientific paper
An experiment was performed in which a complete X-ray survey of the 8.2 steradians of the sky at galactic latitudes where the absolute value of b is 20 deg down to a limiting sensitivity of 3.1 x ten to the minus 11th power ergs/sq cm sec in the 2-10 keV band. Of the 85 detected sources 17 were identified with galactic objects, 61 were identified with extragalactic objects, and 7 remain unidentified. The log N - log S relation for the non-galactic objects is well fit by the Euclidean relationship. The X-ray spectra of these objects were used to construct log N - log S in physical units. The complete sample of identified sources was used to construct X-ray luminosity functions, using the absolute maximum likelihood method, for clusters galaxies and active galactic nuclei.
Boldt Elihu A.
Holt Stephen S.
Marshall Francis E.
Mushotzky Richard F.
Piccinotti G.
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