Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

G.~A. Kriss, G. De Rosa, J. Ely, B.~M. Peterson, J. Kaastra, M. Mehdipour, G.~J. Ferland, M. Dehghanian, S. Mathur, R. Edelson, K.~T. Korista, N. Arav, A.~J. Barth, M.~C. Bentz, W.~N. Brandt, D.~M. Crenshaw, E. Dalla Bontà, K.~D. Denney, C. Done, M. Eracleous & 147 others M.~M. Fausnaugh, E. Gardner, M.~R. Goad, C.~J. Grier, Keith Horne, C.~S. Kochanek, I.~M. McHardy, H. Netzer, A. Pancoast, L. Pei, R.~W. Pogge, D. Proga, C. Silva, N. Tejos, M. Vestergaard, S.~M. Adams, M.~D. Anderson, P. Arévalo, T.~G. Beatty, E. Behar, V.~N. Bennert, S. Bianchi, A. Bigley, S. Bisogni, R. Boissay-Malaquin, G.~A. Borman, M.~C. Bottorff, A.~A. Breeveld, M. Brotherton, J.~E. Brown, J.~E. Brown, E.~M. Cackett, G. Canalizo, M. Cappi, M.~T. Carini, K.~I. Clubb, J.~M. Comerford, C.~T. Coker, E.~M. Corsini, E. Costantini, S. Croft, K.~V. Croxall, A.~J. Deason, A. De Lorenzo-Cáceres, B. De Marco, M. Dietrich, L. Di Gesu, J. Ebrero, P.~A. Evans, A.~V. Filippenko, K. Flatland, E.~L. Gates, N. Gehrels, S. Geier, J.~M. Gelbord, L. Gonzalez, V. Gorjian, D. Grupe, A. Gupta, P.~B. Hall, C.~B. Henderson, S. Hicks, E. Holmbeck, T.~W. -S. Holoien, T.~A. Hutchison, M. Im, J.~J. Jensen, C.~A. Johnson, M.~D. Joner, S. Kaspi, B.~C. Kelly, P.~L. Kelly, J.~A. Kennea, M. Kim, S.~C. Kim, S.~Y. Kim, A. King, S.~A. Klimanov, Y. Krongold, M.~W. Lau, J.~C. Lee, D.~C. Leonard, Miao Li, P. Lira, C. Lochhaas, Zhiyuan Ma, F. MacInnis, M.~A. Malkan, E.~R. Manne-Nicholas, G. Matt, J.~C. Mauerhan, R. McGurk, C. Montuori, L. Morelli, A. Mosquera, D. Mudd, F. Müller-Sánchez, S.~V. Nazarov, R.~P. Norris, J.~A. Nousek, M.~L. Nguyen, P. Ochner, D.~N. Okhmat, S. Paltani, J.~R. Parks, C. Pinto, A. Pizzella, R. Poleski, G. Ponti, J. -U. Pott, S.~E. Rafter, H. -W. Rix, J. Runnoe, D.~A. Saylor, J.~S. Schimoia, K. Schnülle, B. Scott, S.~G. Sergeev, B.~J. Shappee, I. Shivvers, M. Siegel, G.~V. Simonian, A. Siviero, A. Skielboe, G. Somers, M. Spencer, D. Starkey, D.~J. Stevens, H. -I. Sung, J. Tayar, K.~G. Teems, T. Treu, C.~S. Turner, P. Uttley, J. . Van Saders, L. Vican, C. Villforth, Jr. Villanueva S., D.~J. Walton, T. Waters, Y. Weiss, J. -H. Woo, H. Yan, H. Yuk, W. Zheng, W. Zhu, Y. Zu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We model the ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained with the Hubble Space Telescope during the 6 month reverberation mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Ly and C iv, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Ly and C iv have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show a delayed response to continuum variations corresponding to recombination in gas with a density of ∼10 5 cm -3. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in ∼2012 corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state.

Original languageEnglish
Article number153
Number of pages136
JournalAstrophysical Journal
Volume881
Issue number2
DOIs
Publication statusPublished - 20 Aug 2019

Keywords

  • galaxies: active
  • galaxies: individual: NGC 5548
  • galaxies: nuclei
  • galaxies: Seyfert
  • Astrophysics - Astrophysics of Galaxies

Cite this

Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum. / Kriss, G.~A.; De Rosa, G.; Ely, J.; Peterson, B.~M.; Kaastra, J.; Mehdipour, M.; Ferland, G.~J.; Dehghanian, M.; Mathur, S.; Edelson, R.; Korista, K.~T.; Arav, N.; Barth, A.~J.; Bentz, M.~C.; Brandt, W.~N.; Crenshaw, D.~M.; Dalla Bontà, E.; Denney, K.~D.; Done, C.; Eracleous, M.; Fausnaugh, M.~M.; Gardner, E.; Goad, M.~R.; Grier, C.~J.; Horne, Keith; Kochanek, C.~S.; McHardy, I.~M.; Netzer, H.; Pancoast, A.; Pei, L.; Pogge, R.~W.; Proga, D.; Silva, C.; Tejos, N.; Vestergaard, M.; Adams, S.~M.; Anderson, M.~D.; Arévalo, P.; Beatty, T.~G.; Behar, E.; Bennert, V.~N.; Bianchi, S.; Bigley, A.; Bisogni, S.; Boissay-Malaquin, R.; Borman, G.~A.; Bottorff, M.~C.; Breeveld, A.~A.; Brotherton, M.; Brown, J.~E.; Brown, J.~E.; Cackett, E.~M.; Canalizo, G.; Cappi, M.; Carini, M.~T.; Clubb, K.~I.; Comerford, J.~M.; Coker, C.~T.; Corsini, E.~M.; Costantini, E.; Croft, S.; Croxall, K.~V.; Deason, A.~J.; De Lorenzo-Cáceres, A.; De Marco, B.; Dietrich, M.; Di Gesu, L.; Ebrero, J.; Evans, P.~A.; Filippenko, A.~V.; Flatland, K.; Gates, E.~L.; Gehrels, N.; Geier, S.; Gelbord, J.~M.; Gonzalez, L.; Gorjian, V.; Grupe, D.; Gupta, A.; Hall, P.~B.; Henderson, C.~B.; Hicks, S.; Holmbeck, E.; Holoien, T.~W. -S.; Hutchison, T.~A.; Im, M.; Jensen, J.~J.; Johnson, C.~A.; Joner, M.~D.; Kaspi, S.; Kelly, B.~C.; Kelly, P.~L.; Kennea, J.~A.; Kim, M.; Kim, S.~C.; Kim, S.~Y.; King, A.; Klimanov, S.~A.; 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.; Matt, G.; Mauerhan, J.~C.; McGurk, R.; Montuori, C.; Morelli, L.; Mosquera, A.; Mudd, D.; Müller-Sánchez, F.; Nazarov, S.~V.; Norris, R.~P.; Nousek, J.~A.; Nguyen, M.~L.; Ochner, P.; Okhmat, D.~N.; Paltani, S.; Parks, J.~R.; Pinto, C.; Pizzella, A.; Poleski, R.; Ponti, G.; Pott, J. -U.; Rafter, S.~E.; Rix, H. -W.; Runnoe, J.; Saylor, D.~A.; Schimoia, J.~S.; Schnülle, 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.; Teems, K.~G.; Treu, T.; Turner, C.~S.; Uttley, P.; . Van Saders, J.; Vican, L.; Villforth, C.; Villanueva S., Jr.; Walton, D.~J.; Waters, T.; Weiss, Y.; Woo, J. -H.; Yan, H.; Yuk, H.; Zheng, W.; Zhu, W.; Zu, Y.

In: Astrophysical Journal, Vol. 881, No. 2, 153, 20.08.2019.

Research output: Contribution to journalArticle

Kriss, GA, De Rosa, G, Ely, J, Peterson, BM, Kaastra, J, Mehdipour, M, Ferland, GJ, Dehghanian, M, Mathur, S, Edelson, R, Korista, KT, Arav, N, Barth, AJ, Bentz, MC, Brandt, WN, Crenshaw, DM, Dalla Bontà, E, Denney, KD, Done, C, Eracleous, M, Fausnaugh, MM, Gardner, E, Goad, MR, Grier, CJ, Horne, K, Kochanek, CS, McHardy, IM, Netzer, H, Pancoast, A, Pei, L, Pogge, RW, Proga, D, Silva, C, Tejos, N, Vestergaard, M, Adams, SM, Anderson, MD, Arévalo, P, Beatty, TG, Behar, E, Bennert, VN, Bianchi, S, Bigley, A, Bisogni, S, Boissay-Malaquin, R, Borman, GA, Bottorff, MC, Breeveld, AA, Brotherton, M, Brown, JE, Brown, JE, Cackett, EM, Canalizo, G, Cappi, M, Carini, MT, Clubb, KI, Comerford, JM, Coker, CT, Corsini, EM, Costantini, E, Croft, S, Croxall, KV, Deason, AJ, De Lorenzo-Cáceres, A, De Marco, B, Dietrich, M, Di Gesu, L, Ebrero, J, Evans, PA, Filippenko, AV, Flatland, K, Gates, EL, Gehrels, N, Geier, S, Gelbord, JM, Gonzalez, L, Gorjian, V, Grupe, D, Gupta, A, Hall, PB, Henderson, CB, Hicks, S, Holmbeck, E, Holoien, TW-S, Hutchison, TA, Im, M, Jensen, JJ, Johnson, CA, Joner, MD, Kaspi, S, Kelly, BC, Kelly, PL, Kennea, JA, Kim, M, Kim, SC, Kim, SY, King, A, Klimanov, SA, Krongold, Y, Lau, MW, Lee, JC, Leonard, DC, Li, M, Lira, P, Lochhaas, C, Ma, Z, MacInnis, F, Malkan, MA, Manne-Nicholas, ER, Matt, G, Mauerhan, JC, McGurk, R, Montuori, C, Morelli, L, Mosquera, A, Mudd, D, Müller-Sánchez, F, Nazarov, SV, Norris, RP, Nousek, JA, Nguyen, ML, Ochner, P, Okhmat, DN, Paltani, S, Parks, JR, Pinto, C, Pizzella, A, Poleski, R, Ponti, G, Pott, J-U, Rafter, SE, Rix, H-W, Runnoe, J, Saylor, DA, Schimoia, JS, Schnülle, K, Scott, B, Sergeev, SG, Shappee, BJ, Shivvers, I, Siegel, M, Simonian, GV, Siviero, A, Skielboe, A, Somers, G, Spencer, M, Starkey, D, Stevens, DJ, Sung, H-I, Tayar, J, Teems, KG, Treu, T, Turner, CS, Uttley, P, . Van Saders, J, Vican, L, Villforth, C, Villanueva S., J, Walton, DJ, Waters, T, Weiss, Y, Woo, J-H, Yan, H, Yuk, H, Zheng, W, Zhu, W & Zu, Y 2019, 'Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum', Astrophysical Journal, vol. 881, no. 2, 153. https://doi.org/10.3847/1538-4357/ab3049
Kriss, G.~A. ; De Rosa, G. ; Ely, J. ; Peterson, B.~M. ; Kaastra, J. ; Mehdipour, M. ; Ferland, G.~J. ; Dehghanian, M. ; Mathur, S. ; Edelson, R. ; Korista, K.~T. ; Arav, N. ; Barth, A.~J. ; Bentz, M.~C. ; Brandt, W.~N. ; Crenshaw, D.~M. ; Dalla Bontà, E. ; Denney, K.~D. ; Done, C. ; Eracleous, M. ; Fausnaugh, M.~M. ; Gardner, E. ; Goad, M.~R. ; Grier, C.~J. ; Horne, Keith ; Kochanek, C.~S. ; McHardy, I.~M. ; Netzer, H. ; Pancoast, A. ; Pei, L. ; Pogge, R.~W. ; Proga, D. ; Silva, C. ; Tejos, N. ; Vestergaard, M. ; Adams, S.~M. ; Anderson, M.~D. ; Arévalo, P. ; Beatty, T.~G. ; Behar, E. ; Bennert, V.~N. ; Bianchi, S. ; Bigley, A. ; Bisogni, S. ; Boissay-Malaquin, R. ; Borman, G.~A. ; Bottorff, M.~C. ; Breeveld, A.~A. ; Brotherton, M. ; Brown, J.~E. ; Brown, J.~E. ; Cackett, E.~M. ; Canalizo, G. ; Cappi, M. ; Carini, M.~T. ; Clubb, K.~I. ; Comerford, J.~M. ; Coker, C.~T. ; Corsini, E.~M. ; Costantini, E. ; Croft, S. ; Croxall, K.~V. ; Deason, A.~J. ; De Lorenzo-Cáceres, A. ; De Marco, B. ; Dietrich, M. ; Di Gesu, L. ; Ebrero, J. ; Evans, P.~A. ; Filippenko, A.~V. ; Flatland, K. ; Gates, E.~L. ; Gehrels, N. ; Geier, S. ; Gelbord, J.~M. ; Gonzalez, L. ; Gorjian, V. ; Grupe, D. ; Gupta, A. ; Hall, P.~B. ; Henderson, C.~B. ; Hicks, S. ; Holmbeck, E. ; Holoien, T.~W. -S. ; Hutchison, T.~A. ; Im, M. ; Jensen, J.~J. ; Johnson, C.~A. ; Joner, M.~D. ; Kaspi, S. ; Kelly, B.~C. ; Kelly, P.~L. ; Kennea, J.~A. ; Kim, M. ; Kim, S.~C. ; Kim, S.~Y. ; King, A. ; Klimanov, S.~A. ; 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. ; Matt, G. ; Mauerhan, J.~C. ; McGurk, R. ; Montuori, C. ; Morelli, L. ; Mosquera, A. ; Mudd, D. ; Müller-Sánchez, F. ; Nazarov, S.~V. ; Norris, R.~P. ; Nousek, J.~A. ; Nguyen, M.~L. ; Ochner, P. ; Okhmat, D.~N. ; Paltani, S. ; Parks, J.~R. ; Pinto, C. ; Pizzella, A. ; Poleski, R. ; Ponti, G. ; Pott, J. -U. ; Rafter, S.~E. ; Rix, H. -W. ; Runnoe, J. ; Saylor, D.~A. ; Schimoia, J.~S. ; Schnülle, 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. ; Teems, K.~G. ; Treu, T. ; Turner, C.~S. ; Uttley, P. ; . Van Saders, J. ; Vican, L. ; Villforth, C. ; Villanueva S., Jr. ; Walton, D.~J. ; Waters, T. ; Weiss, Y. ; Woo, J. -H. ; Yan, H. ; Yuk, H. ; Zheng, W. ; Zhu, W. ; Zu, Y. / Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum. In: Astrophysical Journal. 2019 ; Vol. 881, No. 2.
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title = "Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum",
abstract = "We model the ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained with the Hubble Space Telescope during the 6 month reverberation mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Ly and C iv, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Ly and C iv have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show a delayed response to continuum variations corresponding to recombination in gas with a density of ∼10 5 cm -3. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in ∼2012 corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state.",
keywords = "galaxies: active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert, Astrophysics - Astrophysics of Galaxies",
author = "G.~A. Kriss and {De Rosa}, G. and J. Ely and B.~M. Peterson and J. Kaastra and M. Mehdipour and G.~J. Ferland and M. Dehghanian and S. Mathur and R. Edelson and K.~T. Korista and N. Arav and A.~J. Barth and M.~C. Bentz and W.~N. Brandt and D.~M. Crenshaw and {Dalla Bont{\`a}}, E. and K.~D. Denney and C. Done and M. Eracleous and M.~M. Fausnaugh and E. Gardner and M.~R. Goad and C.~J. Grier and Keith Horne and C.~S. Kochanek and I.~M. McHardy and H. Netzer and A. Pancoast and L. Pei and R.~W. Pogge and D. Proga and C. Silva and N. Tejos and M. Vestergaard and S.~M. Adams and M.~D. Anderson and P. Ar{\'e}valo and T.~G. Beatty and E. Behar and V.~N. Bennert and S. Bianchi and A. Bigley and S. Bisogni and R. Boissay-Malaquin and G.~A. Borman and M.~C. Bottorff and A.~A. Breeveld and M. Brotherton and J.~E. Brown and J.~E. Brown and E.~M. Cackett and G. Canalizo and M. Cappi and M.~T. Carini and K.~I. Clubb and J.~M. Comerford and C.~T. Coker and E.~M. Corsini and E. Costantini and S. Croft and K.~V. Croxall and A.~J. Deason and {De Lorenzo-C{\'a}ceres}, A. and {De Marco}, B. and M. Dietrich and {Di Gesu}, L. and J. Ebrero and P.~A. Evans and A.~V. Filippenko and K. Flatland and E.~L. Gates and N. Gehrels and S. Geier and J.~M. Gelbord and L. Gonzalez and V. Gorjian and D. Grupe and A. Gupta and P.~B. Hall and C.~B. Henderson and S. Hicks and E. Holmbeck and Holoien, {T.~W. -S.} and T.~A. Hutchison and M. Im and J.~J. Jensen and C.~A. Johnson and M.~D. Joner and S. Kaspi and B.~C. Kelly and P.~L. Kelly and J.~A. Kennea and M. Kim and S.~C. Kim and S.~Y. Kim and A. King and S.~A. Klimanov and Y. Krongold and M.~W. Lau and J.~C. Lee and D.~C. Leonard and Miao Li and P. Lira and C. Lochhaas and Zhiyuan Ma and F. MacInnis and M.~A. Malkan and E.~R. Manne-Nicholas and G. Matt and J.~C. Mauerhan and R. McGurk and C. Montuori and L. Morelli and A. Mosquera and D. Mudd and F. M{\"u}ller-S{\'a}nchez and S.~V. Nazarov and R.~P. Norris and J.~A. Nousek and M.~L. Nguyen and P. Ochner and D.~N. Okhmat and S. Paltani and J.~R. Parks and C. Pinto and A. Pizzella and R. Poleski and G. Ponti and Pott, {J. -U.} and S.~E. Rafter and Rix, {H. -W.} and J. Runnoe and D.~A. Saylor and J.~S. Schimoia and K. Schn{\"u}lle and B. Scott and S.~G. Sergeev and B.~J. Shappee and I. Shivvers and M. Siegel and G.~V. Simonian and A. Siviero and A. Skielboe and G. Somers and M. Spencer and D. Starkey and D.~J. Stevens and Sung, {H. -I.} and J. Tayar and K.~G. Teems and T. Treu and C.~S. Turner and P. Uttley and {. Van Saders}, J. and L. Vican and C. Villforth and {Villanueva S.}, Jr. and D.~J. Walton and T. Waters and Y. Weiss and Woo, {J. -H.} and H. Yan and H. Yuk and W. Zheng and W. Zhu and Y. Zu",
year = "2019",
month = "8",
day = "20",
doi = "10.3847/1538-4357/ab3049",
language = "English",
volume = "881",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "2",

}

TY - JOUR

T1 - Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum

AU - Kriss, G.~A.

AU - De Rosa, G.

AU - Ely, J.

AU - Peterson, B.~M.

AU - Kaastra, J.

AU - Mehdipour, M.

AU - Ferland, G.~J.

AU - Dehghanian, M.

AU - Mathur, S.

AU - Edelson, R.

AU - Korista, K.~T.

AU - Arav, N.

AU - Barth, A.~J.

AU - Bentz, M.~C.

AU - Brandt, W.~N.

AU - Crenshaw, D.~M.

AU - Dalla Bontà, E.

AU - Denney, K.~D.

AU - Done, C.

AU - Eracleous, M.

AU - Fausnaugh, M.~M.

AU - Gardner, E.

AU - Goad, M.~R.

AU - Grier, C.~J.

AU - Horne, Keith

AU - Kochanek, C.~S.

AU - McHardy, I.~M.

AU - Netzer, H.

AU - Pancoast, A.

AU - Pei, L.

AU - Pogge, R.~W.

AU - Proga, D.

AU - Silva, C.

AU - Tejos, N.

AU - Vestergaard, M.

AU - Adams, S.~M.

AU - Anderson, M.~D.

AU - Arévalo, P.

AU - Beatty, T.~G.

AU - Behar, E.

AU - Bennert, V.~N.

AU - Bianchi, S.

AU - Bigley, A.

AU - Bisogni, S.

AU - Boissay-Malaquin, R.

AU - Borman, G.~A.

AU - Bottorff, M.~C.

AU - Breeveld, A.~A.

AU - Brotherton, M.

AU - Brown, J.~E.

AU - Brown, J.~E.

AU - Cackett, E.~M.

AU - Canalizo, G.

AU - Cappi, M.

AU - Carini, M.~T.

AU - Clubb, K.~I.

AU - Comerford, J.~M.

AU - Coker, C.~T.

AU - Corsini, E.~M.

AU - Costantini, E.

AU - Croft, S.

AU - Croxall, K.~V.

AU - Deason, A.~J.

AU - De Lorenzo-Cáceres, A.

AU - De Marco, B.

AU - Dietrich, M.

AU - Di Gesu, L.

AU - Ebrero, J.

AU - Evans, P.~A.

AU - Filippenko, A.~V.

AU - Flatland, K.

AU - Gates, E.~L.

AU - Gehrels, N.

AU - Geier, S.

AU - Gelbord, J.~M.

AU - Gonzalez, L.

AU - Gorjian, V.

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.~A.

AU - Im, M.

AU - Jensen, J.~J.

AU - Johnson, C.~A.

AU - Joner, M.~D.

AU - Kaspi, S.

AU - Kelly, B.~C.

AU - Kelly, P.~L.

AU - Kennea, J.~A.

AU - Kim, M.

AU - Kim, S.~C.

AU - Kim, S.~Y.

AU - King, A.

AU - Klimanov, S.~A.

AU - Krongold, Y.

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 - Matt, G.

AU - Mauerhan, J.~C.

AU - McGurk, R.

AU - Montuori, C.

AU - Morelli, L.

AU - Mosquera, A.

AU - Mudd, D.

AU - Müller-Sánchez, 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 - Paltani, S.

AU - Parks, J.~R.

AU - Pinto, C.

AU - Pizzella, A.

AU - Poleski, R.

AU - Ponti, G.

AU - Pott, J. -U.

AU - Rafter, S.~E.

AU - Rix, H. -W.

AU - Runnoe, J.

AU - Saylor, D.~A.

AU - Schimoia, J.~S.

AU - Schnülle, 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 - Teems, K.~G.

AU - Treu, T.

AU - Turner, C.~S.

AU - Uttley, P.

AU - . Van Saders, J.

AU - Vican, L.

AU - Villforth, C.

AU - Villanueva S., Jr.

AU - Walton, D.~J.

AU - Waters, T.

AU - Weiss, Y.

AU - Woo, J. -H.

AU - Yan, H.

AU - Yuk, H.

AU - Zheng, W.

AU - Zhu, W.

AU - Zu, Y.

PY - 2019/8/20

Y1 - 2019/8/20

N2 - We model the ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained with the Hubble Space Telescope during the 6 month reverberation mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Ly and C iv, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Ly and C iv have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show a delayed response to continuum variations corresponding to recombination in gas with a density of ∼10 5 cm -3. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in ∼2012 corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state.

AB - We model the ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 obtained with the Hubble Space Telescope during the 6 month reverberation mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblends the individual emission lines. Using the modeled spectra, we measure the response to continuum variations for the deblended and absorption-corrected individual broad emission lines, the velocity-dependent profiles of Ly and C iv, and the narrow and broad intrinsic absorption features. We find that the time lags for the corrected emission lines are comparable to those for the original data. The velocity-binned lag profiles of Ly and C iv have a double-peaked structure indicative of a truncated Keplerian disk. The narrow absorption lines show a delayed response to continuum variations corresponding to recombination in gas with a density of ∼10 5 cm -3. The high-ionization narrow absorption lines decorrelate from continuum variations during the same period as the broad emission lines. Analyzing the response of these absorption lines during this period shows that the ionizing flux is diminished in strength relative to the far-ultraviolet continuum. The broad absorption lines associated with the X-ray obscurer decrease in strength during this same time interval. The appearance of X-ray obscuration in ∼2012 corresponds with an increase in the luminosity of NGC 5548 following an extended low state. We suggest that the obscurer is a disk wind triggered by the brightening of NGC 5548 following the decrease in size of the broad-line region during the preceding low-luminosity state.

KW - galaxies: active

KW - galaxies: individual: NGC 5548

KW - galaxies: nuclei

KW - galaxies: Seyfert

KW - Astrophysics - Astrophysics of Galaxies

UR - http://www.scopus.com/inward/record.url?scp=85072346415&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ab3049

DO - 10.3847/1538-4357/ab3049

M3 - Article

VL - 881

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 153

ER -