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

  • Author(s): Horne, K
  • Rosa, GD
  • Peterson, BM
  • Barth, AJ
  • Ely, J
  • Fausnaugh, MM
  • Kriss, GA
  • Pei, L
  • Bentz, MC
  • Cackett, EM
  • Edelson, R
  • Eracleous, M
  • Goad, MR
  • Grier, CJ
  • Kaastra, J
  • Kochanek, CS
  • Krongold, Y
  • Mathur, S
  • Netzer, H
  • Proga, D
  • Tejos, N
  • Vestergaard, M
  • Villforth, C
  • Adams, SM
  • Anderson, MD
  • Arévalo, P
  • Beatty, TG
  • Bennert, VN
  • Bigley, A
  • Bisogni, S
  • Borman, GA
  • Boroson, TA
  • Bottorff, MC
  • Brandt, WN
  • Breeveld, AA
  • Brotherton, M
  • Brown, JE
  • Brown, JS
  • Canalizo, G
  • Carini, MT
  • Clubb, KI
  • Comerford, JM
  • Corsini, EM
  • Crenshaw, DM
  • Croft, S
  • Croxall, KV
  • Bonta, ED
  • Deason, AJ
  • Dehghanian, M
  • Lorenzo-Cáceres, AD
  • Denney, KD
  • Dietrich, M
  • Done, C
  • Efimova, NV
  • Evans, PA
  • Ferland, GJ
  • Filippenko, AV
  • Flatland, K
  • Fox, OD
  • Gardner, E
  • Gates, EL
  • Gehrels, N
  • Geier, S
  • Gelbord, JM
  • Gonzalez, L
  • Gorjian, V
  • Greene, JE
  • Grupe, D
  • Gupta, A
  • Hall, PB
  • Henderson, CB
  • Hicks, S
  • Holmbeck, E
  • Holoien, TWS
  • Hutchison, T
  • Im, M
  • Jensen, JJ
  • Johnson, CA
  • Joner, MD
  • Jones, J
  • Kaspi, S
  • Kelly, PL
  • Kennea, JA
  • Kim, M
  • Kim, S
  • Kim, SC
  • King, A
  • Klimanov, SA
  • Korista, KT
  • Lau, MW
  • Lee, JC
  • Leonard, DC
  • Li, M
  • Lira, P
  • Lochhaas, C
  • Ma, Z
  • Macinnis, F
  • Malkan, MA
  • Manne-Nicholas, ER
  • Mauerhan, JC
  • et al.
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.

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