Stability of the broad line region geometry and dynamics in Arp 151 over seven years
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The Seyfert 1 galaxy Arp 151 was monitored as part of three reverberation mapping campaigns spanning 2008−2015. We present modeling of these velocity-resolved reverberation mapping datasets using a geometric and dynamical model for the broad line region (BLR). By modeling each of the three datasets independently, we infer the evolution of the BLR structure in Arp 151 over a total of seven years and constrain the systematic uncertainties in non-varying parameters such as the black hole mass. We find that the BLR geometry of a thick disk viewed close to face-on is stable over this time, although the size of the BLR grows by a factor of 2. The dynamics of the BLR are dominated by inflow and the inferred black hole mass is consistent for the three datasets, despite the increase in BLR size. Combining the inference for the three datasets yields a black hole mass and statistical uncertainty of log10(MBH/M⊙) = 6.82(^+0.09_−0.09) with a standard deviation in individual measurements of 0.13 dex.
Pancoast , A , Barth , A J , Horne , K D , Treu , T , Brewer , B J , Bennert , V N , Canalizo , G , Gates , E L , Li , W , Malkan , M A , Sand , D , Schmidt , T , Valenti , S , Woo , J H , Clubb , K I , Cooper , M C , Crawford , S M , Hönig , S F , Joner , M D , Kandrashoff , M T , Lazarova , M , Nierenberg , A M , Romero-Colmenero , E , Son , D , Tollerud , E , Walsh , J L & Winkler , H 2018 , ' Stability of the broad line region geometry and dynamics in Arp 151 over seven years ' Astrophysical Journal .
© 2018, American Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://iopscience.iop.org/journal/0004-637X
KH acknowledges support from STFC grant ST/M001296/1.
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