Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548

Journal
Date Issued
2021
Author(s)
Horne, Keith
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Rosa, G. De
•
Peterson, B. M.
•
Barth, A. J.
•
Ely, J.
•
Fausnaugh, M. M.
•
Kriss, G. A.
•
Pei, L.
•
Bentz, M. C.
•
Cackett, E. M.
•
Edelson, R.
•
Eracleous, M.
•
Goad, M. R.
•
Grier, C. J.
•
Kaastra, J.
•
Kochanek, C. S.
•
Krongold, Y.
•
Mathur, S.
•
Netzer, H.
•
Proga, D.
•
Tejos, N.
•
Vestergaard, M.
•
Villforth, C.
•
Adams, S. M.
•
Anderson, M. D.
•
Arévalo, P.
•
Beatty, T. G.
•
Bennert, V. N.
•
Bigley, A.
•
•
Borman, G. A.
•
Boroson, T. A.
•
Bottorff, M. C.
•
Brandt, W. N.
•
Breeveld, A. A.
•
Brotherton, M.
•
Brown, J. E.
•
Brown, J. S.
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Canalizo, G.
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Carini, M. T.
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Clubb, K. I.
•
Comerford, J. M.
•
Corsini, E. M.
•
Crenshaw, D. M.
•
Croft, S.
•
Croxall, K. V.
•
Bonta, E. Dalla
•
Deason, A. J.
•
Dehghanian, M.
•
Lorenzo-Cáceres, A. De
•
Denney, K. D.
•
Dietrich, M.
•
Done, C.
•
Efimova, N. V.
•
Evans, P. A.
•
Ferland, G. J.
•
Filippenko, A. V.
•
Flatland, K.
•
Fox, O. D.
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Gardner, E.
•
Gates, E. L.
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Gehrels, N.
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Geier, S.
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Gelbord, J. M.
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Gonzalez, L.
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Gorjian, V.
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Greene, J. E.
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Grupe, D.
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Gupta, A.
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Hall, P. B.
•
Henderson, C. B.
•
Hicks, S.
•
Holmbeck, E.
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Holoien, T. W.S.
•
Hutchison, T.
•
Im, M.
•
Jensen, J. J.
•
Johnson, C. A.
•
Joner, M. D.
•
Jones, J.
•
Kaspi, S.
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Kelly, P. L.
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Kennea, J. A.
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Kim, M.
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Kim, S.
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Kim, S. C.
•
King, A.
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Klimanov, S. A.
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Korista, K. T.
•
Lau, M. W.
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Lee, J. C.
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Leonard, D. C.
•
Li, Miao
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Lira, P.
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Lochhaas, C.
•
Ma, Zhiyuan
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Macinnis, F.
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Malkan, M. A.
•
Manne-Nicholas, E. R.
•
Mauerhan, J. C.
DOI
Abstract
In this contribution, we achieve the primary goal of the active galactic nucleus (AGN) STORM campaign by recovering velocity-delay maps for the prominent broad emission lines (Lyα, C iv, He ii, and Hβ) in the spectrum of NGC 5548. These are the most detailed velocity-delay maps ever obtained for an AGN, providing unprecedented information on the geometry, ionization structure, and kinematics of the broad-line region. Virial envelopes enclosing the emission-line responses show that the reverberating gas is bound to the black hole. A stratified ionization structure is evident. The He ii response inside 5-10 lt-day has a broad single-peaked velocity profile. The Lyα, C iv, and Hβ responses extend from inside 2 to outside 20 lt-day, with double peaks at ±2500 km s-1 in the 10-20 lt-day delay range. An incomplete ellipse in the velocity-delay plane is evident in Hβ. We interpret the maps in terms of a Keplerian disk with a well-defined outer rim at R = 20 lt-day. The far-side response is weaker than that from the near side. The line-center delay days gives the inclination i ≈ 45°. The inferred black hole mass is M BH ≈ 7 × 107 M o˙. In addition to reverberations, the fit residuals confirm that emission-line fluxes are depressed during the "BLR Holiday"identified in previous work. Moreover, a helical "Barber-Pole"pattern, with stripes moving from red to blue across the C iv and Lyα line profiles, suggests azimuthal structure rotating with a 2 yr period that may represent precession or orbital motion of inner-disk structures casting shadows on the emission-line region farther out.
Volume
907
Issue
2
Start page
76
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2021ApJ...907...76H
Rights
open.access
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