The number count distribution for X-ray-selected BL Lacertae objects and constraints on the luminosity function

Details The number count distribution for X-ray-selected BL Lacertae objects and constraints on the luminosity function The number count distribution for X-ray-selected BL Lacertae objects and constraints on the luminosity function

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..314w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 314-319.

Astronomy and Astrophysics

Astronomy

34

Bl Lacertae Objects, Galactic Nuclei, Red Shift, Stellar Luminosity, X Ray Astronomy, Astronomical Models, Quasars, Seyfert Galaxies, X Ray Sources, Pl Lacertae Objects, Galaxies: Nuclei, Galaxies: X-Rays

Scientific paper

In this paper we describe a sample of 34 BL Lac objects extracted from the Einstein Extended Medium Sensitivity Survey. X-ray selection has proved to be a powerful way to find new BL Lac objects and to generate complete and well-defined samples. We compute the number-count relationship and compare it with the results of other X-ray surveys. Then, we assume different models of the intrinsic X-ray luminosity function and study the effect of beamed X-ray emission on the resulting observed luminosity function, comparing the predicted number-count distribution with the observed one. Using the available redshift information, we can exclude that the AGN X-ray luminosity function (we include in the class of AGN all emission-line objects, like quasars and Seyfert galaxies), modified by beaming, can describe that of BL Lac objects, even though the predicted log N-log S relationship is in agreement with the observations.

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