The Lick AGN Monitoring Project 2011: Dynamical Modeling of the Broad-line Region

Peter R. Williams, Anna Pancoast, Tommaso Treu, Brendon J. Brewer, Aaron J. Barth, Vardha N. Bennert, Tabitha Buehler, Gabriela Canalizo, S. Bradley Cenko, Kelsey I. Clubb, Michael C. Cooper, Alexei V. Filippenko, Elinor Gates, Sebastian F. Hoenig, Michael D. Joner, Michael T. Kandrashoff, Clifton David Laney, Mariana S. Lazarova, Weidong Li, Matthew A. MalkanJacob Rex, Jeffrey M. Silverman, Erik Tollerud, Jonelle L. Walsh, Jong Hak Woo

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


We present models of the Hβ-emitting broad-line region (BLR) in seven Seyfert 1 galaxies from the Lick AGN Monitoring Project 2011 sample, drawing inferences on the BLR structure and dynamics as well as the mass of the central supermassive black hole. We find that the BLR is generally a thick disk, viewed close to face-on, with preferential emission back toward the ionizing source. The dynamics in our sample range from near-circular elliptical orbits to inflowing or outflowing trajectories. We measure black hole masses of for PG 1310-108, for Mrk 50, for Mrk 141, for Mrk 279, for Mrk 1511, for NGC 4593, and for Zw 229-015. We use these black hole mass measurements along with cross-correlation time lags and line widths to recover the scale factor f used in traditional reverberation mapping measurements. Combining our results with other studies that use this modeling technique, which brings our sample size to 16, we calculate a scale factor that can be used for measuring black hole masses in other reverberation mapping campaigns. When using the root-mean-square (rms) spectrum and using the line dispersion to measure the line width, we find pred = 0.57 0.19. Finally, we search for correlations between f and other AGN and BLR parameters and find marginal evidence that f is correlated with M BH and the BLR inclination angle, but no significant evidence of a correlation with the AGN luminosity or Eddington ratio.

Original languageEnglish (US)
Article number75
JournalAstrophysical Journal
Issue number2
StatePublished - Oct 20 2018


  • galaxies: Seyfert
  • galaxies: active
  • galaxies: nuclei

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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