Black hole masses of BL Lac objects

Details Black hole masses of BL Lac objects Black hole masses of BL Lac objects

2002-10-04

arxiv.org/abs/astro-ph/0210113v1

Astronomy and Astrophysics

Astrophysics

6 pages; to appear in "High Energy Blazar Astronomy" (eds. L.O.Takalo, E.Valtaoja), ASP Conference Series

Scientific paper

The correlation between black hole mass M(BH) and the central stellar velocity dispersion sigma in nearby elliptical galaxies affords a novel way to determine M(BH) in active galaxies. We report on measurements of sigma from optical spectra of 7 BL Lac host galaxies. The range of sigma (160 - 290 km/s) corresponds to estimated M(BH) of 5 x 10^7 - 9 x 10^8 Mo. The average ratio of M(BH) to the host galaxy mass is 1.4 x 10^-3, consistent with that estimated in other active and inactive galaxies. The range of sigma and M(BH) of the BL Lacs are similar to those obtained for low redshift radio galaxies, in good agreement with the predictions of the unified models for radio-loud active galaxies.

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