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25 April 2024

» arxiv » 0810.3004

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First Results from the Lick AGN Monitoring Project: The Mass of the Black Hole in Arp 151
Misty C. Bentz ; Jonelle L. Walsh ; Aaron J. Barth ; Nairn Baliber ; Nicola Bennert ; Gabriela Canalizo ; Alexei V. Filippenko ; Mohan Ganeshalingam ; Elinor L. Gates ; Jenny E. Greene ; Marton G. Hidas ; Kyle D. Hiner ; Nicholas Lee ; Weidong Li ; Matthew A. Malkan ; Takeo Minezaki ; Frank J. D. Serduke ; Joshua H. Shiode ; Jeffrey M. Silverman ; Thea N. Steele ; Daniel Stern ; Rachel A. Street ; Carol E. Thornton ; Tommaso Treu ; Xiaofeng Wang ; Jong-Hak Woo ; Yuzuru Yoshii ;
Date:	16 Oct 2008
Abstract:	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.
Source:	arXiv, 0810.3004
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