Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..614m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 614-616. Research supported by the Harvard-Smithson
Astronomy and Astrophysics
Astrophysics
5
Completeness, Heao 2, Quasars, X Ray Sources, Interstellar Extinction, X Ray Absorption
Scientific paper
The Medium Sensitivity Survey (MSS) quasar sample is being used more and more to study quasar properties in general and to analyze the relationship between X-ray-selected and optically selected quasars in particular. These studies have recently shown that current knowledge of the properties of optically selected quasars (luminosity function, evolution, X-ray to optical luminosity ratio) leads to the prediction that many more X-ray-selected quasars should have been detected than are actually observed. Prompted by this fact, a detailed examination of possible causes of incompleteness of the MSS quasar sample has been undertaken, paying particular attention to the problem of photoelectric absorption due to the interstellar medium within the Galaxy. It is found that there is no evidence of a loss of sources due to the effects considered, and that the MSS quasar sample is statistically complete.
Gioia Isabella Maria
Maccacaro Tomasso
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