Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380...49m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. 49-65. Research supported by Smithsonian Scholarly S
Astronomy and Astrophysics
Astrophysics
151
Active Galactic Nuclei, Bl Lacertae Objects, Luminosity, Red Shift, X Ray Sources, Active Galaxies, Quasars, Radio Galaxies
Scientific paper
Redshifts for an X-ray-selected, flux-limited sample of BL Lac objects are presented. A median X-ray luminosity of 10 exp 19.83 W/Hz is derived. A correlation between the optical and radio luminosity of these objects is also found. The complete redshift information allows measurement of the objects' evolution with redshift and calculation of a luminosity function at zero redshift. Evidence is found for strong 'negative' evolution (BL Lac objects were either less common or less luminous in the recent past). The differences between radio- and X-ray-selected samples of BL Lac objects are discussed, and it is suggested that X-ray selection picks out chiefly beamed FR I radio galaxies, while radio selection finds a mix of beamed and microlensed quasars, along with extreme examples of beamed FR I radio galaxies.
della Ceca Roberto
Gioia Isabella Maria
Maccacaro Tommaso
Morris Simon L.
Schild Rudy E.
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