Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548
Creators: name: Horne, Keith
name: De Rosa, G.
name: Peterson, B. M.
name: Barth, A. J.
name: Ely, J.
name: Fausnaugh, M. M.
name: Kriss, G. A.
name: Pei, L.
name: Adams, S. M.
name: Anderson, M. D.
name: Arevalo, P.
name: Beatty, T G.
name: Bennert, V. N.
name: Bentz, M. C.
name: Bigley, A.
name: Bisogni, S.
name: Borman, G. A.
name: Boroson, T. A.
name: Bottorff, M. C.
name: Brandt, W. N.
name: Breeveld, A. A.
name: Brotherton, M.
name: Brown, J. E.
name: Brown, J. S.
name: Cackett, E. M.
name: Canalizo, G.
name: Carini, M. T.
name: Clubb, K. I.
name: Comerford, J. M.
name: Corsini, E. M.
name: Crenshaw, D. M.
name: Croft, S.
name: Croxall, K. V.
name: Bonta, E. Dalla
name: Deason, A. J.
name: Dehghanian, M.
name: De Lorenzo-Caceres, A.
name: Denney, K. D.
name: Dietrich, M.
name: Done, C.
name: Edelson, R.
name: Efimova, N. V.
name: Eracleous, M.
name: Evans, P. A.
name: Ferland, G. J.
name: Filippenko, A. V.
name: Flatland, K.
name: Fox, O. D.
name: Gardner, E.
name: Gates, E. L.
name: Gehrels, N.
name: Geier, S.
name: Gelbord, J. M.
name: Goad, M. R.
name: Gonzalez, L.
name: Gorjian, V.
name: Greene, J. E.
name: Grier, C. J.
name: Grupe, D.
name: Gupta, A.
name: Hall, P. B.
name: Henderson, C. B.
name: Hicks, S.
name: Holmbeck, E.
name: Holoien, T. W. -S.
name: Hutchison, T.
name: Im, M.
name: Jensen, J. J.
name: Johnson, C. A.
name: Joner, M. D.
name: Jones, J.
name: Kaastra, J.
name: Kaspi, S.
name: Kelly, P. L.
name: Kennea, J. A.
name: Kim, M.
name: Kim, S.
name: Kim, S. C.
name: King, A.
name: Klimanov, S. A.
name: Kochanek, C. S.
name: Korista, K. T.
name: Krongold, Y.
name: Lau, M. W.
name: Lee, J. C.
name: Leonard, D. C.
name: Li, Miao
name: Lira, P.
name: Lochhaas, C.
name: Ma, Zhiyuan
name: MacInnis, F.
name: Malkan, M. A.
name: Manne-Nicholas, E. R.
name: Mathur, S.
name: Mauerhan, J. C.
name: McGurk, R.
name: Hardy, I. M. Mc
name: Montuori, C.
name: Morelli, L.
name: Mosquera, A.
name: Mudd, D.
name: Mueller-Sanchez, F.
name: Nazarov, S. V.
name: Netzer, H.
name: Norris, R. P.
name: Nousek, J. A.
name: Nguyen, M. L.
name: Ochner, P.
name: Okhmat, D. N.
name: Pancoast, A.
name: Papadakis, I.
name: Parks, J. R.
name: Penny, M. T.
name: Pizzella, A.
name: Pogge, R. W.
name: Poleski, R.
name: Pott, J. -U.
name: Proga, D.
name: Rafter, S. E.
name: Rix, H. -W.
name: Runnoe, J.
name: Saylor, D. A.
name: Schimoia, J. S.
name: Schnuelle, K.
name: Scott, B.
name: Sergeev, S. G.
name: Shappee, B. J.
name: Shivvers, I.
name: Siegel, M.
name: Simonian, G. V.
name: Siviero, A.
name: Skielboe, A.
name: Somers, G.
name: Spencer, M.
name: Starkey, D.
name: Stevens, D. J.
name: Strauss, M. A.
name: Sung, H. -I.
name: Tayar, J.
name: Teems, K. G.
name: Tejos, N.
name: Treu, T.
name: Turner, C. S.
name: Uttley, P.
name: Van Saders, J .
name: Vestergaard, M.
name: Vican, L.
name: Villanueva, S.
name: Villforth, C.
name: Weiss, Y.
name: Woo, J. -H.
name: Yan, H.
name: Young, S.
name: Yuk, H.
name: Zakamska, N. L.
name: Zheng, W.
name: Zhu, W.
name: Zu, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report velocity-delay maps for prominent broad emission lines, Ly_alpha, CIV, HeII and H_beta, in the spectrum of NGC5548. The emission-line responses inhabit the interior of a virial envelope. The velocity-delay maps reveal stratified ionization structure. The HeII response inside 5-10 light-days has a broad single-peaked velocity profile. The Ly_alpha, CIV, and H_beta responses peak inside 10 light-days, extend outside 20 light-days, and exhibit a velocity profile with two peaks separated by 5000 km/s in the 10 to 20 light-day delay range. The velocity-delay maps show that the M-shaped lag vs velocity structure found in previous cross-correlation analysis is the signature of a Keplerian disk with a well-defined outer edge at R=20 light-days. The outer wings of the M arise from the virial envelope, and the U-shaped interior of the M is the lower half of an ellipse in the velocity-delay plane. The far-side response is weaker than that from the near side, so that we see clearly the lower half, but only faintly the upper half, of the velocity--delay ellipse. The delay tau=(R/c)(1-sin(i))=5 light-days at line center is from the near edge of the inclined ring, giving the inclination i=45 deg. A black hole mass of M=7x10^7 Msun is consistent with the velocity-delay structure. A barber-pole pattern with stripes moving from red to blue across the CIV and possibly Ly_alpha line profiles suggests the presence of azimuthal structure rotating around the far side of the broad-line region and may be the signature of precession or orbital motion of structures in the inner disk. Further HST observations of NGC 5548 over a multi-year timespan but with a cadence of perhaps 10 days rather than 1 day could help to clarify the nature of this new AGN phenomenon.
description: 19 pages, 9 figures, ApJ in press