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


  • 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-106-107 M. 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 H lag measurement in this object of 4.25+0.68-0.66 days in the observed frame. Coupled with the width of the H emission line in the variable spectrum, we determine a black hole mass of (7.1 1.2) 106 M, assuming the Onken et al. normalization for reverberation-based virial masses. We also find velocity-resolved lag information within the H emission line which clearly shows infalling gas in the H-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. 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.

published proceedings

  • The Astrophysical Journal

altmetric score

  • 0.25

author list (cited authors)

  • Bentz, M. C., Walsh, J. L., Barth, A. J., Baliber, N., Bennert, N., Canalizo, G., ... Yoshii, Y.

citation count

  • 70

complete list of authors

  • Bentz, Misty C||Walsh, Jonelle L||Barth, Aaron J||Baliber, Nairn||Bennert, Nicola||Canalizo, Gabriela||Filippenko, Alexei V||Ganeshalingam, Mohan||Gates, Elinor L||Greene, Jenny E||Hidas, Marton G||Hiner, Kyle D||Lee, Nicholas||Li, Weidong||Malkan, Matthew A||Minezaki, Takeo||Serduke, Frank JD||Shiode, Joshua H||Silverman, Jeffrey M||Steele, Thea N||Stern, Daniel||Street, Rachel A||Thornton, Carol E||Treu, Tommaso||Wang, Xiaofeng||Woo, Jong-Hak||Yoshii, Yuzuru

publication date

  • January 2008