Journal Article

Dynamical black hole masses of BL Lac objects from the Sloan Digital Sky Survey

R. M. Plotkin, S. Markoff, S. C. Trager and S. F. Anderson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 2, pages 805-812
Published in print May 2011 | ISSN: 0035-8711
Published online April 2011 | e-ISSN: 1365-2966 | DOI:
Dynamical black hole masses of BL Lac objects from the Sloan Digital Sky Survey

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We measure black hole masses for 71 BL Lac objects from the Sloan Digital Sky Survey with redshifts out to z∼ 0.4. We perform spectral decompositions of their nuclei from their host galaxies and measure their stellar velocity dispersions. Black hole masses are then derived from the black hole mass – stellar velocity dispersion relation. We find BL Lac objects host black holes of similar masses, ∼108.5 M, with a dispersion of ±0.4 dex, similar to the uncertainties on each black hole measurement. Therefore, all BL Lac objects in our sample have the same indistinguishable black hole mass. These 71 BL Lac objects follow the black hole mass–bulge luminosity relation, and their narrow range of host galaxy luminosities confirm previous claims that BL Lac host galaxies can be treated as standard candles. We conclude that the observed diversity in the shapes of BL Lac object spectral energy distributions is not strongly driven by black hole mass or host galaxy properties.

Keywords: galaxies: active; BL Lacertae objects: general; galaxies: jets; galaxies: kinematics and dynamics

Journal Article.  5968 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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