Open Access BASE2020

Space telescope and optical reverberation mapping project. xii. broad-line Region Modeling of NGC 5548

Williams, P. R; Pancoast, A; Treu, T; Brewer, B. J; Peterson, B. M; Barth, A. J; Malkan, M. A; De Rosa, G; Horne, Keith; Kriss, G. A; Arav, N; Bentz, M. C; Cackett, E. M; Dalla Bonta, E; Dehghanian, M; Done, C; Ferland, G. J; Grier, C. J; Kaastra, J; Kara, E; Kochanek, C. S; Mathur, S; Mehdipour, M; Pogge, R. W; Proga, D; Vestergaard, M; Waters, T; Adams, S. M; Anderson, M. D; Arévalo, P; Beatty, Thomas G; Bennert, V. N; Bigley, A; Bisogni, S; Borman, G. A; Boroson, T. A; Bottorff, M. C; Brandt, W. N; Brotherton, M; Brown, J. E; Brown, J. S; Canalizo, G; Carini, M. T; Clubb, K. I; Comerford, J. M; Corsini, E. M; Crenshaw, D. M; Croft, S; Croxall, K. V; Deason, A. J; De Lorenzo Cáceres, A; Denney, K. D; Dietrich, M; Edelson, R; Efimova, N. V; Ely, J; Evans, P. A; Fausnaugh, M. M; Filippenko, A. V; Flatland, K; Fox, O. D; Breeveld, A. A; Gardner, E; Gates, E. L; Gehrels, N; Geier, S; Gelbord, J. M; González, L; Gorjian, V; Greene, J. E; Grupe, D; Gupta, A; Hall, P. B; Henderson, C. B; Hicks, S; Holmbeck, E; Holoien, T. W.-S; Hutchison, T; Im, M; Jensen, J. J; Johnson, C. A; Joner, M. D; Jones, J; Kaspi, S; Kelly, P. L; Kennea, J. A; Kim, M; Kim, S; Kim, S. C; King, A; Klimanov, S. A; Knigge, C; Krongold, Y; Lau, M. W; Lee, J. C; Leonard, D. C; Li, Miao; Lira, P; Lochhaas, C; Ma, Zhiyuan; MacInnis, F; Manne-Nicholas, E. R; Mauerhan, J. C; McGurk, R; McHardy, I. M; Montuori, C; Morelli, L; Mosquera, A; Mudd, D; Muller Sánchez, F; Nazarov, S. V; Norris, R. P; Nousek, J. A; Nguyen, M. L; Ochner, P; Okhmat, D. N; Papadakis, I; Parks, J. R; Pei, L; Penny, M. T; Pizzella, A; Poleski, R; Pott, J. U; Rafter, S. E; Rix, H.-W; Runnoe, J; Saylor, D. A; Schimoia, J. S; Scott, B; Sergeev, S. G; Shappee, B. J; Shivvers, I; Siegel, M; Simonian, G. V; Siviero, A; Skielboe, A; Somers, G; Spencer, M; Starkey, D; Stevens, D. J; Sung, H. -I; Tayar, J; Tejos, N; Turner, C. S; Uttley, P; Van Saders, J; Vaughan, S. A; Vican, L; Villanueva, S; Villforth, C; Weiss, Y; Woo, J. -H; Yan, H; Young, S; Yuk, H; Zheng, W; Zhu, W; Zu, Y

Open Access

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 H beta, Civ, and Ly alpha broad emission lines. We find an extended disk-like H beta BLR with a mixture of near-circular and outflowing gas trajectories, while the Civand Ly alpha BLRs are much less extended and resemble shell-like structures. There is clear radial structure in the BLR, with Civand Ly alpha emission arising at smaller radii than the H beta 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 log(10) (M-BH/M-circle dot) = 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 theVband is a suitable proxy for the ionizing continuum when exploring the BLR structure and kinematics. Finally, we compare the H beta 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. ; National Aeronautics & Space Administration (NASA) AST-1908952 AST-1814440 Space Telescope Science Institute National Science Foundation (NSF) AST-1211916 Packard Foundation through a Packard Fellowship AST-1412315 AST-1907208 Space Telescope Science Institute 17-ATP17-0141 19-ATP19-0188 NRF grant HST-AR-15018 HST-AR-14556 Korean Government 2020R1A2C3011091 Independent Research Fund Denmark DFF 8021-00130 NASA ADAP grant 80NSSC19K1016 National Science Foundation (NSF) Eberly Research Fellowship from The Pennsylvania State University Eberly College of Science AST-1909297 Center for Exoplanets Pennsylvania State University Eberly College of Science Pennsylvania Space Grant Consortium TABASGO Foundation Christopher R. Redlich Fund Miller Institute for Basic Research in Science (U.C. Berkeley)