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Date and Time of the Query: 2019-08-21 T20:24:20 PDT
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For refcode 2002ApJ...569L..35F:
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2002ApJ...569L..35F The Black Hole Mass of BL Lacertae Objects from the Stellar Velocity Dispersion of the Host Galaxy R. Falomo Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy; falomo@pd.astro.it J. K. Kotilainen Tuorla Observatory, University of Turku, Vaisalantie 20, FIN-21500 Piikkio, Finland; jarkot@astro.utu.fi and A. Treves Universita dell'Insubria, via Valleggio 11, 22100 Como, Italy; treves@mib.infn.it Received 2002 February 21; accepted 2002 March 12; published 2002 March 18 ABSTRACT The correlation between black hole mass M_BH_ and stellar velocity dispersion {sigma} in nearby elliptical galaxies affords us a novel way to determine M_BH_ in active galaxies. We report on measurements of {sigma} from optical spectra of seven BL Lacertae host galaxies. The derived values of {sigma} are in the range of 160-290 km s^-1^ corresponding to M_BH_ of 5 x 10^7^-1 x 10^9^ M_sun_. 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 velocity dispersions and the derived values of M_BH_ of the BL Lac objects 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. Subject headings: BL Lacertae objects: general - galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: kinematics and dynamics - galaxies: nuclei
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