BL Lac objects as an evolving population

Details BL Lac objects as an evolving population BL Lac objects as an evolving population

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156...33c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 33-37. Research supported by the Ministero della P

Astronomy and Astrophysics

Astronomy

5

Bl Lacertae Objects, Galactic Evolution, X Ray Astronomy, Active Galactic Nuclei, Radio Jets (Astronomy)

Scientific paper

The authors discuss the apparently anomalous behaviour of the number counts of BL Lacertae objects, currently estimated to be much flatter than the counts of the other active galactic nuclei. They show how that peculiarity can be understood and quantitatively accounted for, if these objects stem from a population of conventionally evolving active galactic nuclei, but are singled out by a fraction of their power channelled into a randomly oriented, modestly relativistic jet of emitting particles. The authors present explicit predictions to be compared with future, statistically significant optical counts at B ≅ 16 - 17, and X-ray counts at fluxes ⪉10-12erg cm-2s-1 at a few keV, that can elicit the underlying intrinsic evolutionary behaviour.

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