A Caltech Library Service

Space Telescope and Optical Reverberation Mapping Project. XII. Broad-Line Region Modeling of NGC 5548

Williams, P. R. and Pancoast, A. and Treu, T. and Brewer, B. J. and Peterson, B. M. and Barth, A. J. and Malkan, M. A. and De Rosa, G. and Horne, Keith and Kriss, G. A. and Arav, N. and Bentz, M. C. and Cackett, E. M. and Dalla Bontà, E. and Dehghanian, M. and Done, C. and Ferland, G. J. and Grier, C. J. and Kaastra, J. and Kara, E. and Kochanek, C. S. and Mathur, S. and Mehdipour, M. and Pogge, R. W. and Proga, D. and Vestergaard, M. and Waters, T. and Adams, S. M. and Anderson, M. D. and Arévalo, P. and Beatty, T. G. and Bennert, V. N. and Bigley, A. and Bisogni, S. and Borman, G. A. and Boroson, T. A. and Bottorff, M. C. and Brandt, W. N. and Breeveld, A. A. and Brotherton, M. and Brown, J. E. and Brown, J. S. and Canalizo, G. and Carini, M. T. and Clubb, K. I. and Comerford, J. M. and Corsini, E. M. and Crenshaw, D. M. and Croft, S. and Croxall, K. V. and Deason, A. J. and De Lorenzo-Cáceres, A. and Denney, K. D. and Dietrich, M. and Edelson, R. and Efimova, N. V. and Ely, J. and Evans, P. A. and Fausnaugh, M. M. and Filippenko, A. V. and Flatland, K. and Fox, O. D. and Gardner, E. and Gates, E. L. and Gehrels, N. and Geier, S. and Gelbord, J. M. and Gonzalez, L. and Gorjian, V. and Greene, J. E. and Grupe, D. and Gupta, A. and Hall, P. B. and Henderson, C. B. and Hicks, S. and Holmbeck, E. and Holoien, T. W.-S. and Hutchison, T. and Im, M. and Jensen, J. J. and Johnson, C. A. and Joner, M. D. and Jones, J. and Kaspi, S. and Kelly, P. L. and Kennea, J. A. and Kim, M. and Kim, S. and Kim, S. C. and King, A. and Klimanov, S. A. and Knigge, C. and Krongold, Y. and Lau, M. W. and Lee, J. C. and Leonard, D. C. and Li, Miao and Lira, P. and Lochhaas, C. and Ma, Zhiyuan and MacInnis, F. and Manne-Nicholas, E. R. and Mauerhan, J. C. and McGurk, R. and McHardy, I. M. and Montuori, C. and Morelli, L. and Mosquera, A. and Mudd, D. and Müller-Sánchez, F. and Nazarov, S. V. and Norris, R. P. and Nousek, J. A. and Nguyen, M. L. and Ochner, P. and Okhmat, D. N. and Papadakis, I. and Parks, J. R. and Pei, L. and Penny, M. T. and Pizzella, A. and Poleski, R. and Pott, J.-U. and Rafter, S. E. and Rix, H.-W. and Runnoe, J. and Saylor, D. A. and Schimoia, J. S. and Scott, B. and Sergeev, S. G. and Shappee, B. J. and Shivvers, I. and Siegel, M. and Simonian, G. V. and Siviero, A. and Skielboe, A. and Somers, G. and Spencer, M. and Starkey, D. and Stevens, D. J. and Sung, H.-I. and Tayar, J. and Tejos, N. and Turner, C. S. and Uttley, P. and Van Saders, J. and Vaughan, S. A. and Vican, L. and Villanueva, S. and Villforth, C. and Weiss, Y. and Woo, J.-H. and Yan, H. and Young, S. and Yuk, H. and Zheng, W. and Zhu, W. and Zu, Y. (2020) Space Telescope and Optical Reverberation Mapping Project. XII. Broad-Line Region Modeling of NGC 5548. Astrophysical Journal, 902 (1). Art. No. 74. ISSN 1538-4357. doi:10.3847/1538-4357/abbad7.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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 Lyα 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 Lyα BLRs are much less extended and resemble shell-like structures. There is clear radial structure in the BLR, with C iv and Lyα 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 log₁₀(M_(BH)/M_⊙) = 7.64_(-0.18)^(+0.21). 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Williams, P. R.0000-0002-4645-6578
Pancoast, A.0000-0003-1065-5046
Treu, T.0000-0002-8460-0390
Peterson, B. M.0000-0001-6481-5397
Barth, A. J.0000-0002-3026-0562
Malkan, M. A.0000-0001-6919-1237
Horne, Keith0000-0003-1728-0304
Kriss, G. A.0000-0002-2180-8266
Bentz, M. C.0000-0002-2816-5398
Cackett, E. M.0000-0002-8294-9281
Dehghanian, M.0000-0002-0964-7500
Ferland, G. J.0000-0003-4503-6333
Grier, C. J.0000-0001-9920-6057
Kaastra, J.0000-0001-5540-2822
Kara, E.0000-0003-0172-0854
Kochanek, C. S.0000-0001-6017-2961
Mathur, S.0000-0002-0129-0316
Pogge, R. W.0000-0003-1435-3053
Proga, D.0000-0002-6336-5125
Vestergaard, M.0000-0001-9191-9837
Adams, S. M.0000-0001-5855-5939
Arévalo, P.0000-0001-8503-9809
Beatty, T. G.0000-0002-9539-4203
Bennert, V. N.0000-0003-2064-0518
Bisogni, S.0000-0003-3746-4565
Boroson, T. A.0000-0001-9481-1805
Brandt, W. N.0000-0002-0167-2453
Breeveld, A. A.0000-0002-0001-7270
Brotherton, M.0000-0002-1207-0909
Brown, J. S.0000-0002-1885-6419
Canalizo, G.0000-0003-4693-6157
Carini, M. T.0000-0001-8961-2465
Crenshaw, D. M.0000-0002-6465-3639
Croft, S.0000-0003-4823-129X
Croxall, K. V.0000-0002-5258-7224
Deason, A. J.0000-0001-6146-2645
Edelson, R.0000-0001-8598-1482
Ely, J.0000-0002-4814-5511
Evans, P. A.0000-0002-8465-3353
Fausnaugh, M. M.0000-0002-9113-7162
Filippenko, A. V.0000-0003-3460-0103
Fox, O. D.0000-0003-2238-1572
Geier, S.0000-0002-3948-9339
Gelbord, J. M.0000-0001-9092-8619
Gorjian, V.0000-0002-8990-2101
Grupe, D.0000-0002-9961-3661
Hall, P. B.0000-0002-1763-5825
Henderson, C. B.0000-0001-8877-9060
Holmbeck, E.0000-0002-5463-6800
Holoien, T. W.-S.0000-0001-9206-3460
Im, M.0000-0002-8537-6714
Kelly, P. L.0000-0003-3142-997X
Kennea, J. A.0000-0002-6745-4790
Lau, M. W.0000-0001-9755-9406
Lee, J. C.0000-0002-2278-9407
Li, Miao0000-0003-0773-582X
Ma, Zhiyuan0000-0003-3270-6844
Mauerhan, J. C.0000-0002-7555-8741
McGurk, R.0000-0003-2064-4105
Müller-Sánchez, F.0000-0002-2713-0628
Norris, R. P.0000-0002-4597-1906
Penny, M. T.0000-0001-7506-5640
Pizzella, A.0000-0001-9585-417X
Poleski, R.0000-0002-9245-6368
Pott, J.-U.0000-0003-4291-2078
Rix, H.-W.0000-0003-4996-9069
Runnoe, J.0000-0001-8557-2822
Saylor, D. A.0000-0002-0558-1305
Schimoia, J. S.0000-0002-5640-6697
Shappee, B. J.0000-0003-4631-1149
Shivvers, I.0000-0003-3373-8047
Simonian, G. V.0000-0002-4230-6732
Skielboe, A.0000-0001-9765-3603
Somers, G.0000-0002-9322-0314
Stevens, D. J.0000-0002-5951-8328
Tayar, J.0000-0002-4818-7885
Tejos, N.0000-0002-1883-4252
Turner, C. S.0000-0003-4400-5615
Uttley, P.0000-0001-9355-961X
Villanueva, S.0000-0001-6213-8804
Villforth, C.0000-0002-8956-6654
Additional Information:© 2020. The American Astronomical Society. Received 2020 July 3; revised 2020 September 16; accepted 2020 September 21; published 2020 October 14. Support for HST program No. GO-13330 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Research by P.R.W. and T.T. is supported by NSF grants AST-1412315 and AST-1907208. T.T. and P.R.W. acknowledge support from the Packard Foundation through a Packard Fellowship to T.T. Research by AJB was supported by NSF grant AST-1907290. G.F. and M.D. acknowledge support by NSF (1816537, 1910687), NASA (17-ATP17-0141, 19-ATP19-0188), and STScI (HST-AR-15018, HST-AR-14556). M.I. acknowledges the support form the NRF grant, No. 2020R1A2C3011091, funded by the Korea government (MSIT). M.V. gratefully acknowledges support from the Independent Research Fund Denmark via grant No. DFF 8021-00130. C.S.K. is supported by NSF grants AST-1908952 and AST-1814440. V.N.B. acknowledges assistance from a NASA grant associated with HST proposal GO 15215, a NASA ADAP grant (grant # 80NSSC19K1016) and a National Science Foundation (NSF) Research at Undergraduate Institutions (RUI) grant (AST-1909297). Note that findings and conclusions do not necessarily represent views of the NSF. D.J.S. acknowledges funding support from the Eberly Research Fellowship from The Pennsylvania State University Eberly College of Science. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. A.V.F.'s group at U.C. Berkeley is grateful for the financial support of NSF grant AST-1211916, the TABASGO Foundation, the Christopher R. Redlich Fund, and the Miller Institute for Basic Research in Science (U.C. Berkeley). Research at Lick Observatory is partially supported by a generous gift from Google.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
NASA Hubble FellowshipHST-AR-15018
NASA Hubble FellowshipHST-AR-14556
National Research Foundation of Korea2020R1A2C3011091
Ministry of Science and ICT (Korea)UNSPECIFIED
Danish Council for Independent ResearchDFF 8021-00130
Eberly College of ScienceUNSPECIFIED
Pennsylvania State UniversityUNSPECIFIED
Pennsylvania Space Grant ConsortiumUNSPECIFIED
Christopher R. Redlich FundUNSPECIFIED
Miller Institute for Basic Research in ScienceUNSPECIFIED
Subject Keywords:Active galaxies ; Active galactic nuclei ; Reverberation mapping ; Seyfert galaxies
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Active galaxies (17); Active galactic nuclei (16); Reverberation mapping (2019); Seyfert galaxies (1447)
Record Number:CaltechAUTHORS:20201014-111855496
Persistent URL:
Official Citation:P. R. Williams et al 2020 ApJ 902 74
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106056
Deposited By: George Porter
Deposited On:14 Oct 2020 19:33
Last Modified:16 Nov 2021 18:49

Repository Staff Only: item control page