Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356...75p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 75-82.
Astronomy and Astrophysics
Astronomy
122
Bl Lacertae Objects, Radio Galaxies, X Ray Astronomy, Emission Spectra, Luminosity, Radio Jets (Astronomy), Red Shift, Rosat Mission
Scientific paper
The hypothesis that BL Lacertae objects are a special subset of Fanaroff-Riley type I radio galaxies, namely, those dominated by beamed emission from a relativistic jet aligned with the line of sight, is examined by looking at the relative number densities. The calculation depends primarily on observed quantities, including the X-ray luminosity function of Fanaroff-Riley type I galaxies. The model predicts the X-ray luminosity function of BL Lacertae objects, the shape of the X-ray counts below currently observed fluxes, and the velocity of the X-ray emitting jet. With Fanaroff-Riley type I galaxies as the parent population the flat luminosity function, the observed X-ray number counts, and the partial redshift distribution of BL Lacertae objects can be explained.
Padovani Paolo
Urry Claudia Megan
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