Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548

D. Starkey; K. Horne; M.~M. Fausnaugh; B.~M. Peterson; M.~C. Bentz; C.~S. Kochanek; K.~D. Denney; R. Edelson; M.~R. Goad; G. De Rosa; M.~D. Anderson; P. Arévalo; A.~J. Barth; C. Bazhaw; G.~A. Borman; T.~A. Boroson; M.~C. Bottorff; W.~N. Brandt; A.~A. Breeveld; E.~M. Cackett; M.~T. Carini; K.~V. Croxall; D.~M. Crenshaw; E. Dalla Bontà; A. De Lorenzo-Cáceres; M. Dietrich; N.~V. Efimova; J. Ely; P.~A. Evans; A.~V. Filippenko; K. Flatland; N. Gehrels; S. Geier; J.~M. Gelbord; L. Gonzalez; V. Gorjian; C.~J. Grier; D. Grupe; P.~B. Hall; S. Hicks; D. Horenstein; T. Hutchison; M. Im; J.~J. Jensen; M.~D. Joner; J. Jones; J. Kaastra; S. Kaspi; B.~C. Kelly; J.~A. Kennea; S.~C. Kim; M. Kim; S.~A. Klimanov; K.~T. Korista; G.~A. Kriss; J.~C. Lee; D.~C. Leonard; P. Lira; F. MacInnis; E.~R. Manne-Nicholas; S. Mathur; I.~M. McHardy; C. Montouri; R. Musso; S.~V. Nazarov; R.~P. Norris; J.~A. Nousek; D.~N. Okhmat; A. Pancoast; J.~R. Parks; L. Pei; R.~W. Pogge; J.-U. Pott; S.~E. Rafter; H.-W. Rix; D.~A. Saylor; J.~S. Schimoia; K. Schnülle; S.~G. Sergeev; M.~H. Siegel; M. Spencer; H.-I. Sung; K.~G. Teems; C.~S. Turner; P. Uttley; M. Vestergaard; C. Villforth; Y. Weiss; J.-H. Woo; H. Yan; S. Young; W. Zheng; Y. Zu

doi:10.3847/1538-4357/835/1/65

Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548

D. Starkey, K. Horne, M.~M. Fausnaugh, B.~M. Peterson, M.~C. Bentz, C.~S. Kochanek, K.~D. Denney, R. Edelson, M.~R. Goad, G. De Rosa, M.~D. Anderson, P. Arévalo, A.~J. Barth, C. Bazhaw, G.~A. Borman, T.~A. Boroson, M.~C. Bottorff, W.~N. Brandt, A.~A. Breeveld, E.~M. CackettM.~T. Carini, K.~V. Croxall, D.~M. Crenshaw, E. Dalla Bontà, A. De Lorenzo-Cáceres, M. Dietrich, N.~V. Efimova, J. Ely, P.~A. Evans, A.~V. Filippenko, K. Flatland, N. Gehrels, S. Geier, J.~M. Gelbord, L. Gonzalez, V. Gorjian, C.~J. Grier, D. Grupe, P.~B. Hall, S. Hicks, D. Horenstein, T. Hutchison, M. Im, J.~J. Jensen, M.~D. Joner, J. Jones, J. Kaastra, S. Kaspi, B.~C. Kelly, J.~A. Kennea, S.~C. Kim, M. Kim, S.~A. Klimanov, K.~T. Korista, G.~A. Kriss, J.~C. Lee, D.~C. Leonard, P. Lira, F. MacInnis, E.~R. Manne-Nicholas, S. Mathur, I.~M. McHardy, C. Montouri, R. Musso, S.~V. Nazarov, R.~P. Norris, J.~A. Nousek, D.~N. Okhmat, A. Pancoast, J.~R. Parks, L. Pei, R.~W. Pogge, J.-U. Pott, S.~E. Rafter, H.-W. Rix, D.~A. Saylor, J.~S. Schimoia, K. Schnülle, S.~G. Sergeev, M.~H. Siegel, M. Spencer, H.-I. Sung, K.~G. Teems, C.~S. Turner, P. Uttley, M. Vestergaard, C. Villforth, Y. Weiss, J.-H. Woo, H. Yan, S. Young, W. Zheng, Y. Zu

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Abstract

We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves ($1158\,\mathring{\rm A} $ to $9157\,\mathring{\rm A} $) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 January to July. Light-curve variability is interpreted as the reverberation response of the accretion disk to irradiation by a central time-varying point source. Our model yields the disk inclination $i=36^\circ \pm 10^\circ $, temperature ${T}_{1}=(44\pm 6)\times {10}^{3}$ K at 1 light day from the black hole, and a temperature–radius slope ($T\propto {r}^{-\alpha }$) of $\alpha =0.99\pm 0.03$. We also infer the driving light curve and find that it correlates poorly with both the hard and soft X-ray light curves, suggesting that the X-rays alone may not drive the ultraviolet and optical variability over the observing period. We also decompose the light curves into bright, faint, and mean accretion-disk spectra. These spectra lie below that expected for a standard blackbody accretion disk accreting at $L/{L}_{\mathrm{Edd}}=0.1$.

Original language	English
Pages (from-to)	65
Number of pages	1
Journal	Astrophysical Journal
Volume	835
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/835/1/65
Publication status	Published - 18 Jan 2017

Keywords

accretion, accretion disks, galaxies: active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert

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10.3847/1538-4357/835/1/65

Starkey_2017_ApJ_835_65
This is an author-created, un-copyedited version of an article published in Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.3847/1538-4357/835/1/65
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Starkey, D., Horne, K., Fausnaugh, M. M., Peterson, B. M., Bentz, M. C., Kochanek, C. S., Denney, K. D., Edelson, R., Goad, M. R., De Rosa, G., Anderson, M. D., Arévalo, P., Barth, A. J., Bazhaw, C., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., ... Zu, Y. (2017). Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548. Astrophysical Journal, 835(1), 65. https://doi.org/10.3847/1538-4357/835/1/65

Starkey, D, Horne, K, Fausnaugh, MM, Peterson, BM, Bentz, MC, Kochanek, CS, Denney, KD, Edelson, R, Goad, MR, De Rosa, G, Anderson, MD, Arévalo, P, Barth, AJ, Bazhaw, C, Borman, GA, Boroson, TA, Bottorff, MC, Brandt, WN, Breeveld, AA, Cackett, EM, Carini, MT, Croxall, KV, Crenshaw, DM, Dalla Bontà, E, De Lorenzo-Cáceres, A, Dietrich, M, Efimova, NV, Ely, J, Evans, PA, Filippenko, AV, Flatland, K, Gehrels, N, Geier, S, Gelbord, JM, Gonzalez, L, Gorjian, V, Grier, CJ, Grupe, D, Hall, PB, Hicks, S, Horenstein, D, Hutchison, T, Im, M, Jensen, JJ, Joner, MD, Jones, J, Kaastra, J, Kaspi, S, Kelly, BC, Kennea, JA, Kim, SC, Kim, M, Klimanov, SA, Korista, KT, Kriss, GA, Lee, JC, Leonard, DC, Lira, P, MacInnis, F, Manne-Nicholas, ER, Mathur, S, McHardy, IM, Montouri, C, Musso, R, Nazarov, SV, Norris, RP, Nousek, JA, Okhmat, DN, Pancoast, A, Parks, JR, Pei, L, Pogge, RW, Pott, J-U, Rafter, SE, Rix, H-W, Saylor, DA, Schimoia, JS, Schnülle, K, Sergeev, SG, Siegel, MH, Spencer, M, Sung, H-I, Teems, KG, Turner, CS, Uttley, P, Vestergaard, M, Villforth, C, Weiss, Y, Woo, J-H, Yan, H, Young, S, Zheng, W & Zu, Y 2017, 'Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548', Astrophysical Journal, vol. 835, no. 1, pp. 65. https://doi.org/10.3847/1538-4357/835/1/65

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title = "Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548",

abstract = "We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves ($1158\,\mathring{\rm A} $ to $9157\,\mathring{\rm A} $) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 January to July. Light-curve variability is interpreted as the reverberation response of the accretion disk to irradiation by a central time-varying point source. Our model yields the disk inclination $i=36^\circ \pm 10^\circ $, temperature ${T}_{1}=(44\pm 6)\times {10}^{3}$ K at 1 light day from the black hole, and a temperature–radius slope ($T\propto {r}^{-\alpha }$) of $\alpha =0.99\pm 0.03$. We also infer the driving light curve and find that it correlates poorly with both the hard and soft X-ray light curves, suggesting that the X-rays alone may not drive the ultraviolet and optical variability over the observing period. We also decompose the light curves into bright, faint, and mean accretion-disk spectra. These spectra lie below that expected for a standard blackbody accretion disk accreting at $L/{L}_{\mathrm{Edd}}=0.1$.",

keywords = "accretion, accretion disks, galaxies: active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert",

author = "D. Starkey and K. Horne and M.~M. Fausnaugh and B.~M. Peterson and M.~C. Bentz and C.~S. Kochanek and K.~D. Denney and R. Edelson and M.~R. Goad and {De Rosa}, G. and M.~D. Anderson and P. Ar{\'e}valo and A.~J. Barth and C. Bazhaw and G.~A. Borman and T.~A. Boroson and M.~C. Bottorff and W.~N. Brandt and A.~A. Breeveld and E.~M. Cackett and M.~T. Carini and K.~V. Croxall and D.~M. Crenshaw and {Dalla Bont{\`a}}, E. and {De Lorenzo-C{\'a}ceres}, A. and M. Dietrich and N.~V. Efimova and J. Ely and P.~A. Evans and A.~V. Filippenko and K. Flatland and N. Gehrels and S. Geier and J.~M. Gelbord and L. Gonzalez and V. Gorjian and C.~J. Grier and D. Grupe and P.~B. Hall and S. Hicks and D. Horenstein and T. Hutchison and M. Im and J.~J. Jensen and M.~D. Joner and J. Jones and J. Kaastra and S. Kaspi and B.~C. Kelly and J.~A. Kennea and S.~C. Kim and M. Kim and S.~A. Klimanov and K.~T. Korista and G.~A. Kriss and J.~C. Lee and D.~C. Leonard and P. Lira and F. MacInnis and E.~R. Manne-Nicholas and S. Mathur and I.~M. McHardy and C. Montouri and R. Musso and S.~V. Nazarov and R.~P. Norris and J.~A. Nousek and D.~N. Okhmat and A. Pancoast and J.~R. Parks and L. Pei and R.~W. Pogge and J.-U. Pott and S.~E. Rafter and H.-W. Rix and D.~A. Saylor and J.~S. Schimoia and K. Schn{\"u}lle and S.~G. Sergeev and M.~H. Siegel and M. Spencer and H.-I. Sung and K.~G. Teems and C.~S. Turner and P. Uttley and M. Vestergaard and C. Villforth and Y. Weiss and J.-H. Woo and H. Yan and S. Young and W. Zheng and Y. Zu",

year = "2017",

month = jan,

day = "18",

doi = "10.3847/1538-4357/835/1/65",

language = "English",

volume = "835",

pages = "65",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

number = "1",

}

TY - JOUR

T1 - Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548

AU - Starkey, D.

AU - Horne, K.

AU - Fausnaugh, M.~M.

AU - Peterson, B.~M.

AU - Bentz, M.~C.

AU - Kochanek, C.~S.

AU - Denney, K.~D.

AU - Edelson, R.

AU - Goad, M.~R.

AU - De Rosa, G.

AU - Anderson, M.~D.

AU - Arévalo, P.

AU - Barth, A.~J.

AU - Bazhaw, C.

AU - Borman, G.~A.

AU - Boroson, T.~A.

AU - Bottorff, M.~C.

AU - Brandt, W.~N.

AU - Breeveld, A.~A.

AU - Cackett, E.~M.

AU - Carini, M.~T.

AU - Croxall, K.~V.

AU - Crenshaw, D.~M.

AU - Dalla Bontà, E.

AU - De Lorenzo-Cáceres, A.

AU - Dietrich, M.

AU - Efimova, N.~V.

AU - Ely, J.

AU - Evans, P.~A.

AU - Filippenko, A.~V.

AU - Flatland, K.

AU - Gehrels, N.

AU - Geier, S.

AU - Gelbord, J.~M.

AU - Gonzalez, L.

AU - Gorjian, V.

AU - Grier, C.~J.

AU - Grupe, D.

AU - Hall, P.~B.

AU - Hicks, S.

AU - Horenstein, D.

AU - Hutchison, T.

AU - Im, M.

AU - Jensen, J.~J.

AU - Joner, M.~D.

AU - Jones, J.

AU - Kaastra, J.

AU - Kaspi, S.

AU - Kelly, B.~C.

AU - Kennea, J.~A.

AU - Kim, S.~C.

AU - Kim, M.

AU - Klimanov, S.~A.

AU - Korista, K.~T.

AU - Kriss, G.~A.

AU - Lee, J.~C.

AU - Leonard, D.~C.

AU - Lira, P.

AU - MacInnis, F.

AU - Manne-Nicholas, E.~R.

AU - Mathur, S.

AU - McHardy, I.~M.

AU - Montouri, C.

AU - Musso, R.

AU - Nazarov, S.~V.

AU - Norris, R.~P.

AU - Nousek, J.~A.

AU - Okhmat, D.~N.

AU - Pancoast, A.

AU - Parks, J.~R.

AU - Pei, L.

AU - Pogge, R.~W.

AU - Pott, J.-U.

AU - Rafter, S.~E.

AU - Rix, H.-W.

AU - Saylor, D.~A.

AU - Schimoia, J.~S.

AU - Schnülle, K.

AU - Sergeev, S.~G.

AU - Siegel, M.~H.

AU - Spencer, M.

AU - Sung, H.-I.

AU - Teems, K.~G.

AU - Turner, C.~S.

AU - Uttley, P.

AU - Vestergaard, M.

AU - Villforth, C.

AU - Weiss, Y.

AU - Woo, J.-H.

AU - Yan, H.

AU - Young, S.

AU - Zheng, W.

AU - Zu, Y.

PY - 2017/1/18

Y1 - 2017/1/18

N2 - We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves ($1158\,\mathring{\rm A} $ to $9157\,\mathring{\rm A} $) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 January to July. Light-curve variability is interpreted as the reverberation response of the accretion disk to irradiation by a central time-varying point source. Our model yields the disk inclination $i=36^\circ \pm 10^\circ $, temperature ${T}_{1}=(44\pm 6)\times {10}^{3}$ K at 1 light day from the black hole, and a temperature–radius slope ($T\propto {r}^{-\alpha }$) of $\alpha =0.99\pm 0.03$. We also infer the driving light curve and find that it correlates poorly with both the hard and soft X-ray light curves, suggesting that the X-rays alone may not drive the ultraviolet and optical variability over the observing period. We also decompose the light curves into bright, faint, and mean accretion-disk spectra. These spectra lie below that expected for a standard blackbody accretion disk accreting at $L/{L}_{\mathrm{Edd}}=0.1$.

AB - We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves ($1158\,\mathring{\rm A} $ to $9157\,\mathring{\rm A} $) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 January to July. Light-curve variability is interpreted as the reverberation response of the accretion disk to irradiation by a central time-varying point source. Our model yields the disk inclination $i=36^\circ \pm 10^\circ $, temperature ${T}_{1}=(44\pm 6)\times {10}^{3}$ K at 1 light day from the black hole, and a temperature–radius slope ($T\propto {r}^{-\alpha }$) of $\alpha =0.99\pm 0.03$. We also infer the driving light curve and find that it correlates poorly with both the hard and soft X-ray light curves, suggesting that the X-rays alone may not drive the ultraviolet and optical variability over the observing period. We also decompose the light curves into bright, faint, and mean accretion-disk spectra. These spectra lie below that expected for a standard blackbody accretion disk accreting at $L/{L}_{\mathrm{Edd}}=0.1$.

KW - accretion, accretion disks, galaxies: active, galaxies: individual: NGC 5548, galaxies: nuclei, galaxies: Seyfert

UR - http://dx.doi.org/10.3847/1538-4357/835/1/65

U2 - 10.3847/1538-4357/835/1/65

DO - 10.3847/1538-4357/835/1/65

M3 - Article

VL - 835

SP - 65

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -

Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548

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