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Space telescope and optical reverberation mapping project. XII. Broad-line region modeling of NGC 5548

Space telescope and optical reverberation mapping project. XII. Broad-line region modeling of NGC 5548
Space telescope and optical reverberation mapping project. XII. Broad-line region modeling of NGC 5548

We present geometric and dynamical modeling of the broad line region (BLR) for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The data set includes photometric and spectroscopic monitoring in the optical and ultraviolet, covering the Hβ, C iv, and Ly broad emission lines. We find an extended disk-like Hβ BLR with a mixture of near-circular and outflowing gas trajectories, while the C iv and Ly BLRs are much less extended and resemble shell-like structures. There is clear radial structure in the BLR, with C iv and Ly emission arising at smaller radii than the Hβ emission. Using the three lines, we make three independent black hole mass measurements, all of which are consistent. Combining these results gives a joint inference of . We examine the effect of using the V band instead of the UV continuum light curve on the results and find a size difference that is consistent with the measured UV-optical time lag, but the other structural and kinematic parameters remain unchanged, suggesting that the V band is a suitable proxy for the ionizing continuum when exploring the BLR structure and kinematics. Finally, we compare the Hβ results to similar models of data obtained in 2008 when the active galactic nucleus was at a lower luminosity state. We find that the size of the emitting region increased during this time period, but the geometry and black hole mass remained unchanged, which confirms that the BLR kinematics suitably gauge the gravitational field of the central black hole.

1447, 16, 17, 2019, Active galactic nuclei, Active galaxies, Reverberation mapping, Seyfert galaxies
0004-637X
Williams, P. R.
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Pancoast, A.
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Treu, T.
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Brewer, B. J.
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Peterson, B. M.
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Barth, A. J.
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Malkan, M. A.
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Rosa, G. De
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Horne, Keith
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Kriss, G. A.
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Arav, N.
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Bentz, M. C.
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Cackett, E. M.
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Bontà, E. Dalla
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Dehghanian, M.
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Done, C.
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Ferland, G. J.
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Grier, C. J.
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Kaastra, J.
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Kara, E.
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Kochanek, C. S.
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Mathur, S.
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Mehdipour, M.
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Pogge, R. W.
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Proga, D.
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Vestergaard, M.
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Waters, T.
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Adams, S. M.
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Anderson, M. D.
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Arévalo, P.
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Beatty, T. G.
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Bennert, V. N.
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Bigley, A.
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Bisogni, S.
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Borman, G. A.
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Boroson, T. A.
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Bottorff, M. C.
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Brandt, W. N.
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Breeveld, A. A.
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Brotherton, M.
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Brown, J. E.
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Brown, J. S.
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Canalizo, G.
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Carini, M. T.
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Clubb, K. I.
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Comerford, J. M.
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Corsini, E. M.
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Crenshaw, D. M.
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Knigge, C.
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Uttley, P.
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et al.
Williams, P. R.
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Pancoast, A.
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Treu, T.
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Brewer, B. J.
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Peterson, B. M.
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Barth, A. J.
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Malkan, M. A.
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Rosa, G. De
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Horne, Keith
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Kriss, G. A.
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Arav, N.
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Bentz, M. C.
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Cackett, E. M.
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Bontà, E. Dalla
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Dehghanian, M.
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Done, C.
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Ferland, G. J.
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Kaastra, J.
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Kara, E.
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Kochanek, C. S.
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Mathur, S.
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Mehdipour, M.
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Pogge, R. W.
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Proga, D.
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Vestergaard, M.
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Waters, T.
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Adams, S. M.
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Anderson, M. D.
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Arévalo, P.
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Beatty, T. G.
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Bennert, V. N.
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Bigley, A.
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Bisogni, S.
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Borman, G. A.
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Boroson, T. A.
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Bottorff, M. C.
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Brandt, W. N.
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Breeveld, A. A.
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Brotherton, M.
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Brown, J. E.
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Brown, J. S.
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Canalizo, G.
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Carini, M. T.
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Clubb, K. I.
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Comerford, J. M.
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Corsini, E. M.
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Crenshaw, D. M.
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Knigge, C.
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Uttley, P.
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Williams, P. R. , et al. (2020) Space telescope and optical reverberation mapping project. XII. Broad-line region modeling of NGC 5548. The Astrophysical Journal, 902 (1), [74]. (doi:10.3847/1538-4357/abbad7).

Record type: Article

Abstract

We present geometric and dynamical modeling of the broad line region (BLR) for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The data set includes photometric and spectroscopic monitoring in the optical and ultraviolet, covering the Hβ, C iv, and Ly broad emission lines. We find an extended disk-like Hβ BLR with a mixture of near-circular and outflowing gas trajectories, while the C iv and Ly BLRs are much less extended and resemble shell-like structures. There is clear radial structure in the BLR, with C iv and Ly emission arising at smaller radii than the Hβ emission. Using the three lines, we make three independent black hole mass measurements, all of which are consistent. Combining these results gives a joint inference of . We examine the effect of using the V band instead of the UV continuum light curve on the results and find a size difference that is consistent with the measured UV-optical time lag, but the other structural and kinematic parameters remain unchanged, suggesting that the V band is a suitable proxy for the ionizing continuum when exploring the BLR structure and kinematics. Finally, we compare the Hβ results to similar models of data obtained in 2008 when the active galactic nucleus was at a lower luminosity state. We find that the size of the emitting region increased during this time period, but the geometry and black hole mass remained unchanged, which confirms that the BLR kinematics suitably gauge the gravitational field of the central black hole.

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Accepted/In Press date: 21 September 2020
Published date: 14 October 2020
Keywords: 1447, 16, 17, 2019, Active galactic nuclei, Active galaxies, Reverberation mapping, Seyfert galaxies

Identifiers

Local EPrints ID: 445846
URI: http://eprints.soton.ac.uk/id/eprint/445846
ISSN: 0004-637X
PURE UUID: 16ab4564-b1e8-4856-a54d-3490d0b7b63e

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Date deposited: 08 Jan 2021 17:33
Last modified: 08 Jan 2021 17:33

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Contributors

Author: P. R. Williams
Author: A. Pancoast
Author: T. Treu
Author: B. J. Brewer
Author: B. M. Peterson
Author: A. J. Barth
Author: M. A. Malkan
Author: G. De Rosa
Author: Keith Horne
Author: G. A. Kriss
Author: N. Arav
Author: M. C. Bentz
Author: E. M. Cackett
Author: E. Dalla Bontà
Author: M. Dehghanian
Author: C. Done
Author: G. J. Ferland
Author: C. J. Grier
Author: J. Kaastra
Author: E. Kara
Author: C. S. Kochanek
Author: S. Mathur
Author: M. Mehdipour
Author: R. W. Pogge
Author: D. Proga
Author: M. Vestergaard
Author: T. Waters
Author: S. M. Adams
Author: M. D. Anderson
Author: P. Arévalo
Author: T. G. Beatty
Author: V. N. Bennert
Author: A. Bigley
Author: S. Bisogni
Author: G. A. Borman
Author: T. A. Boroson
Author: M. C. Bottorff
Author: W. N. Brandt
Author: A. A. Breeveld
Author: M. Brotherton
Author: J. E. Brown
Author: J. S. Brown
Author: G. Canalizo
Author: M. T. Carini
Author: K. I. Clubb
Author: J. M. Comerford
Author: E. M. Corsini
Author: D. M. Crenshaw
Author: C. Knigge
Author: P. Uttley
Corporate Author: et al.

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