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 alpha, C IV, He II, and H beta) 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 alpha, C IV, and H beta 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 beta. 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 tau = (R/c)(1 - sin i) approximate to 5 days gives the inclination i approximate to 45 degrees. The inferred black hole mass is (BH) 7 x 10(7) M-circle dot. 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 alpha 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.
| Original language | English |
|---|---|
| Article number | 76 |
| Journal | Astrophysical Journal |
| Volume | 907 |
| Issue number | 2 |
| Number of pages | 19 |
| ISSN | 0004-637X |
| DOIs | |
| Publication status | Published - Feb 2021 |
Keywords
- TERM PROFILE VARIABILITY
- ACTIVE GALACTIC NUCLEUS
- RADIATION PRESSURE
- MASS
- CONTINUUM
- REGIONS
- DISC
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Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548. / Horne, Keith; 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.; Arevalo, P.; Beatty, T. G.; 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.; Comerford, J. M.; Corsini, E. M.; Crenshaw, D. M.; Croft, S.; Croxall, K. V.; Bonta, E. Dalla; Deason, A. J.; Dehghanian, M.; Lorenzo-Caceres, 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.; Gardner, E.; Gates, E. L.; Gehrels, N.; Geier, S.; Gelbord, J. M.; Gonzalez, L.; Gorjian, V.; Greene, J. E.; 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.; Kaspi, S.; Kelly, P. L.; Kennea, J. A.; Kim, M.; Kim, S.; Kim, S. C.; King, A.; Klimanov, S. A.; Korista, K. T.; 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.; Mauerhan, J. C.; McGurk, R.; McHardy, I. M.; Montuori, C.; Morelli, L.; Mosquera, A.; Mudd, D.; Muller-Sanchez, F.; Nazarov, S. V.; 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.; 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.; Sung, H. -I.; Tayar, J.; Treu, T.; Turner, C. S.; Uttley, P.; Van Saders, J.; Vican, L.; Villanueva, S.; Weiss, Y.; Woo, J. -H.; Yan, H.; Young, S.; Yuk, H.; Zheng, W.; Zhu, W.; Zu, Y.
In: Astrophysical Journal, Vol. 907, No. 2, 76, 02.2021.Research output: Contribution to journal › Journal article › Research › peer-review
}
TY - JOUR
T1 - Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548
AU - Horne, Keith
AU - Rosa, G. De
AU - Peterson, B. M.
AU - Barth, A. J.
AU - Ely, J.
AU - Fausnaugh, M. M.
AU - Kriss, G. A.
AU - Pei, L.
AU - Bentz, M. C.
AU - Cackett, E. M.
AU - Edelson, R.
AU - Eracleous, M.
AU - Goad, M. R.
AU - Grier, C. J.
AU - Kaastra, J.
AU - Kochanek, C. S.
AU - Krongold, Y.
AU - Mathur, S.
AU - Netzer, H.
AU - Proga, D.
AU - Tejos, N.
AU - Vestergaard, M.
AU - Villforth, C.
AU - Adams, S. M.
AU - Anderson, M. D.
AU - Arevalo, P.
AU - Beatty, T. G.
AU - Bennert, V. N.
AU - Bigley, A.
AU - Bisogni, S.
AU - Borman, G. A.
AU - Boroson, T. A.
AU - Bottorff, M. C.
AU - Brandt, W. N.
AU - Breeveld, A. A.
AU - Brotherton, M.
AU - Brown, J. E.
AU - Brown, J. S.
AU - Canalizo, G.
AU - Carini, M. T.
AU - Clubb, K. I.
AU - Comerford, J. M.
AU - Corsini, E. M.
AU - Crenshaw, D. M.
AU - Croft, S.
AU - Croxall, K. V.
AU - Bonta, E. Dalla
AU - Deason, A. J.
AU - Dehghanian, M.
AU - Lorenzo-Caceres, A. De
AU - Denney, K. D.
AU - Dietrich, M.
AU - Done, C.
AU - Efimova, N. V.
AU - Evans, P. A.
AU - Ferland, G. J.
AU - Filippenko, A. V.
AU - Flatland, K.
AU - Fox, O. D.
AU - Gardner, E.
AU - Gates, E. L.
AU - Gehrels, N.
AU - Geier, S.
AU - Gelbord, J. M.
AU - Gonzalez, L.
AU - Gorjian, V.
AU - Greene, J. E.
AU - Grupe, D.
AU - Gupta, A.
AU - Hall, P. B.
AU - Henderson, C. B.
AU - Hicks, S.
AU - Holmbeck, E.
AU - Holoien, T. W. -S.
AU - Hutchison, T.
AU - Im, M.
AU - Jensen, J. J.
AU - Johnson, C. A.
AU - Joner, M. D.
AU - Jones, J.
AU - Kaspi, S.
AU - Kelly, P. L.
AU - Kennea, J. A.
AU - Kim, M.
AU - Kim, S.
AU - Kim, S. C.
AU - King, A.
AU - Klimanov, S. A.
AU - Korista, K. T.
AU - Lau, M. W.
AU - Lee, J. C.
AU - Leonard, D. C.
AU - Li, Miao
AU - Lira, P.
AU - Lochhaas, C.
AU - Ma, Zhiyuan
AU - MacInnis, F.
AU - Malkan, M. A.
AU - Manne-Nicholas, E. R.
AU - Mauerhan, J. C.
AU - McGurk, R.
AU - McHardy, I. M.
AU - Montuori, C.
AU - Morelli, L.
AU - Mosquera, A.
AU - Mudd, D.
AU - Muller-Sanchez, F.
AU - Nazarov, S. V.
AU - Norris, R. P.
AU - Nousek, J. A.
AU - Nguyen, M. L.
AU - Ochner, P.
AU - Okhmat, D. N.
AU - Pancoast, A.
AU - Papadakis, I.
AU - Parks, J. R.
AU - Penny, M. T.
AU - Pizzella, A.
AU - Pogge, R. W.
AU - Poleski, R.
AU - Pott, J. -U.
AU - Rafter, S. E.
AU - Rix, H. -W.
AU - Runnoe, J.
AU - Saylor, D. A.
AU - Schimoia, J. S.
AU - Schnuelle, K.
AU - Scott, B.
AU - Sergeev, S. G.
AU - Shappee, B. J.
AU - Shivvers, I.
AU - Siegel, M.
AU - Simonian, G. V.
AU - Siviero, A.
AU - Skielboe, A.
AU - Somers, G.
AU - Spencer, M.
AU - Starkey, D.
AU - Stevens, D. J.
AU - Sung, H. -I.
AU - Tayar, J.
AU - Treu, T.
AU - Turner, C. S.
AU - Uttley, P.
AU - Van Saders, J.
AU - Vican, L.
AU - Villanueva, S.
AU - Weiss, Y.
AU - Woo, J. -H.
AU - Yan, H.
AU - Young, S.
AU - Yuk, H.
AU - Zheng, W.
AU - Zhu, W.
AU - Zu, Y.
PY - 2021/2
Y1 - 2021/2
N2 - 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 alpha, C IV, He II, and H beta) 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 alpha, C IV, and H beta 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 beta. 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 tau = (R/c)(1 - sin i) approximate to 5 days gives the inclination i approximate to 45 degrees. The inferred black hole mass is (BH) 7 x 10(7) M-circle dot. 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 alpha 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.
AB - 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 alpha, C IV, He II, and H beta) 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 alpha, C IV, and H beta 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 beta. 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 tau = (R/c)(1 - sin i) approximate to 5 days gives the inclination i approximate to 45 degrees. The inferred black hole mass is (BH) 7 x 10(7) M-circle dot. 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 alpha 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.
KW - TERM PROFILE VARIABILITY
KW - ACTIVE GALACTIC NUCLEUS
KW - RADIATION PRESSURE
KW - MASS
KW - CONTINUUM
KW - REGIONS
KW - DISC
U2 - 10.3847/1538-4357/abce60
DO - 10.3847/1538-4357/abce60
M3 - Journal article
VL - 907
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 76
ER -