Fanaroff-Riley I galaxies as the parent population of BL Lacertae objects. II - Optical constraints

Details Fanaroff-Riley I galaxies as the parent population of BL Lacertae objects. II - Optical constraints Fanaroff-Riley I galaxies as the parent population of BL Lacertae objects. II - Optical constraints

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..373p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 20, 1991, p. 373-379.

Astronomy and Astrophysics

Astrophysics

63

Bl Lacertae Objects, Galactic Structure, Radio Galaxies, Active Galactic Nuclei, Astronomical Catalogs, Astronomical Models, Luminosity

Scientific paper

The hypothesis is investigated that BL Lacertae objects are a subset of Fanaroff-Riley (FR) I galaxies dominated by beamed emission from a relativistic jet aligned with the line of sight. It is found that FR I galaxies, although of low radio luminosity, are bright optical galaxies. If the beaming hypothesis is correct, the optical luminosity function of BL Lac objects, including the effect of the host galaxy, can be approximated by a double power law with a given differential index. New estimates of the number counts of BL Lac objects are made which constrain their local number density for L(B) greater than about 6 x 10 to the 43rd ergs/s to be in the range 110-720/cu Gpc. The corresponding ratio between the total number densities of BL Lac objects and FR I galaxies is 0.003 to 0.02. This limits the Lorentz factor of the optical emission to the range 8-20, larger than that of the X-ray emitting plasma and roughly of the same order as the radio Lorentz factor.

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