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arxiv: 0810.3004 · v1 · submitted 2008-10-16 · 🌌 astro-ph

First Results from the Lick AGN Monitoring Project: The Mass of the Black Hole in Arp 151

Misty C. Bentz (1) , Jonelle L. Walsh (1) , Aaron J. Barth (1) , Nairn Baliber (2 , 3) , Nicola Bennert (2 , 4) , Gabriela Canalizo (4
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5) Alexei V. Filippenko (6) Mohan Ganeshalingam (6) Elinor L. Gates (7) Jenny E. Greene (8) Marton G. Hidas (2 Kyle D. Hiner (4 Nicholas Lee (6) Weidong Li (6) Matthew A. Malkan (9) Takeo Minezaki (10) Frank J. D. Serduke (6) Joshua H. Shiode (6) Jeffrey M. Silverman (6) Thea N. Steele (6) Daniel Stern (11) Rachel A. Street (2 Carol E. Thornton (1) Tommaso Treu (2) Xiaofeng Wang (6 12) Jong-Hak Woo (2 9) Yuzuru Yoshii (10 13) ((1) Dept. of Physics Astronomy UC Irvine (2) Dept. of Physics UC Santa Barbara (3) Las Cumbres Observatory Global Telescope (4) Institute of Geophysics Planetary Physics UC Riverside (5) Dept. of Physics (6) Dept. of Astronomy UC Berkeley (7) Lick Observatory (8) Princeton University Observatory (9) Dept. of Physics UCLA (10) Institute of Astronomy School of Science University of Tokyo (11) Jet Propulsion Laboratory (12) Physics Dept. Tsinghua Center for Astrophysics Tsinghua University (13) Research Center for the Early Universe University of Tokyo)
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classification 🌌 astro-ph
keywords blackholehbetalinemassmassescampaigncentral
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We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 13 nearby (z < 0.05) Seyfert 1 galaxies with expected masses in the range ~10^6-10^7 M_sun. We present here the first results from this project -- the mass of the central black hole in Arp 151. Strong variability throughout the campaign led to an exceptionally clean Hbeta lag measurement in this object of 4.25(+0.68/-0.66) days in the observed frame. Coupled with the width of the Hbeta emission line in the variable spectrum, we determine a black hole mass of (7.1 +/- 1.2)x10^6 M_sun, assuming the Onken et al. normalization for reverberation-based virial masses. We also find velocity-resolved lag information within the Hbeta emission line which clearly shows infalling gas in the Hbeta-emitting region. Further detailed analysis may lead to a full model of the geometry and kinematics of broad line region gas around the central black hole in Arp 151.

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