Details

Autor(en) / Beteiligte

• Rosa, G. De
• Ely, J.
• Kriss, G. A.
• Bentz, M. C.
• Edelson, R.
• Eracleous, M.
• Goad, M. R.
• Grier, C. J.
• Krongold, Y.
• Mathur, S.
• Netzer, H.
• Proga, D.
• Vestergaard, M.
• Adams, S. M.
• Bennert, V. N.
• 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.
• Canalizo, G.
• Carini, M. T.
• Clubb, K. I.
• Crenshaw, D. M.
• Croft, S.
• Croxall, K. V.
• Bontà, E. Dalla
• Deason, A. J.
• Dehghanian, M.
• Denney, K. D.
• Dietrich, M.
• Done, C.
• Evans, P. A.
• Ferland, G. J.
• Gates, E. L.
• Gelbord, J. M.
• Gonzalez, L.
• Grupe, D.
• Hall, P. B.
• Holmbeck, E.
• Holoien, T. W.-S.
• Im, M.
• Jensen, J. J.
• Johnson, C. A.
• Joner, M. D.
• Kennea, J. A.
• Kim, M.
• Kim, S. C.
• Klimanov, S. A.
• Lau, M. W.
• Lee, J. C.
• Lira, P.
• Lochhaas, C.
• MacInnis, F.
• Malkan, M. A.
• Mauerhan, J. C.
• McGurk, R.
• Mosquera, A.
• Mudd, D.
• Nazarov, S. V.
• Norris, R. P.
• Nousek, J. A.
• Nguyen, M. L.
• Ochner, P.
• Pancoast, A.
• Parks, J. R.
• Penny, M. T.
• Pizzella, A.
• Pogge, R. W.
• Pott, J.-U.
• Rafter, S. E.
• Runnoe, J.
• Saylor, D. A.
• Schimoia, J. S.
• Schnülle, K.
• Sergeev, S. G.
• Shappee, B. J.
• Simonian, G. V.
• Somers, G.
• Spencer, M.
• Stevens, D. J.
• Sung, H.-I.
• Tayar, J.
• Treu, T.
• Turner, C. S.
• Van Saders, J.
• Vican, L.
• Villanueva, S.
• Weiss, Y.
• Woo, J.-H.
• Yan, H.
• Young, S.
• Yuk, H.
• Zheng, W.
• Zhu, W.

Titel

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

Ist Teil von

• The Astrophysical journal, 2021-02, Vol.907 (2), p.76

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 (Ly α , C iv , He ii , and H β ) 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 Ly α , C iv , and H β 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 H β . 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 τ = ( R / c ) ( 1 − sin i ) ≈ 5 days gives the inclination i  ≈ 45°. The inferred black hole mass is M BH  ≈ 7 × 10 7 M ⊙ . 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 Ly α 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.