학술논문
Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548
Document Type
Working Paper
Author
Horne, Keith; De Rosa, G.; Peterson, B. M.; Barth, A. J.; Ely, J.; Fausnaugh, M. M.; Kriss, G. A.; Pei, L.; Adams, S. M.; Anderson, M. D.; Arevalo, P.; Beatty, T G.; Bennert, V. N.; Bentz, M. C.; Bigley, A.; Bisogni, S.; Borman, G. A.; Boroson, T. A.; Bottorff, M. C.; Brandt, W. N.; Breeveld, A. A.; Brotherton, M.; Brown, J. E.; Brown, J. S.; Cackett, E. M.; Canalizo, G.; Carini, M. T.; 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.; De Lorenzo-Caceres, A.; Denney, K. D.; Dietrich, M.; Done, C.; Edelson, R.; Efimova, N. V.; Eracleous, M.; Evans, P. A.; Ferland, G. J.; Filippenko, A. V.; Flatland, K.; Fox, O. D.; Gardner, E.; Gates, E. L.; Gehrels, N.; Geier, S.; Gelbord, J. M.; Goad, M. R.; Gonzalez, L.; Gorjian, V.; Greene, J. E.; Grier, C. J.; 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.; Kaastra, J.; Kaspi, S.; Kelly, P. L.; Kennea, J. A.; Kim, M.; Kim, S.; Kim, S. C.; King, A.; Klimanov, S. A.; Kochanek, C. S.; Korista, K. T.; Krongold, Y.; Lau, M. W.; Lee, J. C.; Leonard, D. C.; Li, Miao; Lira, P.; Lochhaas, C.; Ma, Zhiyuan; MacInnis, F.; Malkan, M. A.; Manne-Nicholas, E. R.; Mathur, S.; Mauerhan, J. C.; McGurk, R.; Hardy, I. M. Mc; Montuori, C.; Morelli, L.; Mosquera, A.; Mudd, D.; Mueller-Sanchez, F.; Nazarov, S. V.; Netzer, H.; Norris, R. P.; Nousek, J. A.; Nguyen, M. L.; Ochner, P.; Okhmat, D. N.; Pancoast, A.; Papadakis, I.; Parks, J. R.; Penny, M. T.; Pizzella, A.; Pogge, R. W.; Poleski, R.; Pott, J. -U.; Proga, D.; Rafter, S. E.; Rix, H. -W.; Runnoe, J.; Saylor, D. A.; Schimoia, J. S.; Schnuelle, K.; 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.; Strauss, M. A.; Sung, H. -I.; Tayar, J.; Teems, K. G.; Tejos, N.; Treu, T.; Turner, C. S.; Uttley, P.; Van Saders, J .; Vestergaard, M.; Vican, L.; Villanueva Jr, S.; Villforth, C.; Weiss, Y.; Woo, J. -H.; Yan, H.; Young, S.; Yuk, H.; Zakamska, N. L.; Zheng, W.; Zhu, W.; Zu, Y.
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Subject
Language
Abstract
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.
Comment: 19 pages, 9 figures, ApJ in press
Comment: 19 pages, 9 figures, ApJ in press