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Stability of the Broad-line Region Geometry and Dynamics in Arp 151 over Seven Years

Stability of the Broad-line Region Geometry and Dynamics in Arp 151 over Seven Years
Stability of the Broad-line Region Geometry and Dynamics in Arp 151 over Seven Years

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 data sets using a geometric and dynamical model for the broad-line region (BLR). By modeling each of the three data sets independently, we infer the evolution of the BLR structure in Arp 151 over a total of 7 yr and constrain the systematic uncertainties in nonvarying 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 data sets, despite the increase in BLR size. Combining the inference for the three data sets yields a black hole mass and statistical uncertainty of log10(/) = with a standard deviation in individual measurements of 0.13 dex.

galaxies: active, galaxies: individual (Arp 151), galaxies: nuclei, methods: statistical
0004-637X
Pancoast, A.
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Barth, A.J.
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Horne, K.
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Treu, T.
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Brewer, B.J.
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Bennert, V.N.
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Canalizo, G.
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Gates, E.L.
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Li, W.
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Malkan, M.A.
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Sand, D.
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Schmidt, T.
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Valenti, S.
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Hönig, S.F.
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Joner, M.D.
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Kandrashoff, M.T.
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Lazarova, M.
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Nierenberg, A.M.
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Romero-Colmenero, E.
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Son, D.
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Tollerud, E.
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Walsh, J.L.
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Winkler, H.
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Pancoast, A.
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Barth, A.J.
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Horne, K.
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Treu, T.
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Brewer, B.J.
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Bennert, V.N.
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Canalizo, G.
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Gates, E.L.
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Li, W.
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Malkan, M.A.
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Sand, D.
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Schmidt, T.
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Valenti, S.
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Woo, J.H.
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Clubb, K.I.
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Cooper, M.C.
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Crawford, S.M.
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Hönig, S.F.
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Joner, M.D.
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Kandrashoff, M.T.
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Lazarova, M.
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Nierenberg, A.M.
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Romero-Colmenero, E.
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Son, D.
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Tollerud, E.
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Walsh, J.L.
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Winkler, H.
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Pancoast, A., Barth, A.J., Horne, K., 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. and Winkler, H. (2018) Stability of the Broad-line Region Geometry and Dynamics in Arp 151 over Seven Years. The Astrophysical Journal, 856 (2), [108]. (doi:10.3847/1538-4357/aab3c6).

Record type: Article

Abstract

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 data sets using a geometric and dynamical model for the broad-line region (BLR). By modeling each of the three data sets independently, we infer the evolution of the BLR structure in Arp 151 over a total of 7 yr and constrain the systematic uncertainties in nonvarying 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 data sets, despite the increase in BLR size. Combining the inference for the three data sets yields a black hole mass and statistical uncertainty of log10(/) = with a standard deviation in individual measurements of 0.13 dex.

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Stability of the Broad-line Region Geometry and Dynamics in Arp 151 over Seven Years - Accepted Manuscript
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Accepted/In Press date: 28 February 2018
e-pub ahead of print date: 29 March 2018
Published date: 1 April 2018
Keywords: galaxies: active, galaxies: individual (Arp 151), galaxies: nuclei, methods: statistical

Identifiers

Local EPrints ID: 420494
URI: http://eprints.soton.ac.uk/id/eprint/420494
ISSN: 0004-637X
PURE UUID: 32f35942-28f8-4c31-a38f-862780b8ed92

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Date deposited: 09 May 2018 16:30
Last modified: 16 Dec 2019 18:15

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Contributors

Author: A. Pancoast
Author: A.J. Barth
Author: K. Horne
Author: T. Treu
Author: B.J. Brewer
Author: V.N. Bennert
Author: G. Canalizo
Author: E.L. Gates
Author: W. Li
Author: M.A. Malkan
Author: D. Sand
Author: T. Schmidt
Author: S. Valenti
Author: J.H. Woo
Author: K.I. Clubb
Author: M.C. Cooper
Author: S.M. Crawford
Author: S.F. Hönig
Author: M.D. Joner
Author: M.T. Kandrashoff
Author: M. Lazarova
Author: A.M. Nierenberg
Author: E. Romero-Colmenero
Author: D. Son
Author: E. Tollerud
Author: J.L. Walsh
Author: H. Winkler

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