Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies

M.~M. Fausnaugh; D.~A. Starkey; Keith Horne; C.~S. Kochanek; B.~M. Peterson; M.~C. Bentz; K.~D. Denney; C.~J. Grier; D. Grupe; R.~W. Pogge; G. De Rosa; S.~M. Adams; A.~J. Barth; Thomas G. Beatty; A. Bhattacharjee; G.~A. Borman; T.~A. Boroson; M.~C. Bottorff; Jacob E. Brown; Jonathan S. Brown; M.~S. Brotherton; C.~T. Coker; S.~M. Crawford; K.~V. Croxall; Sarah Eftekharzadeh; Michael Eracleous; M.~D. Joner; C.~B. Henderson; T.~W. -S. Holoien; T. Hutchison; Shai Kaspi; S. Kim; Anthea L. King; Miao Li; Cassandra Lochhaas; Zhiyuan Ma; F. MacInnis; E.~R. Manne-Nicholas; M. Mason; Carmen Montuori; Ana Mosquera; Dale Mudd; R. Musso; S.~V. Nazarov; M.~L. Nguyen; D.~N. Okhmat; Christopher A. Onken; B. Ou- Yang; A. Pancoast; L. Pei; Matthew T. Penny; Radoslaw Poleski; Stephen Rafter; E. Romero- Colmenero; Jessie Runnoe; David J. Sand; Jaderson S. Schimoia; S.~G. Sergeev; B.~J. Shappee; Gregory V. Simonian; Garrett Somers; M. Spencer; Daniel J. Stevens; Jamie Tayar; T. Treu; Stefano Valenti; J. Van Saders; Jr. Villanueva S.; C. Villforth; Yaniv Weiss; H. Winkler; W. Zhu

doi:10.3847/1538-4357/aaaa2b

Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies

M.~M. Fausnaugh, D.~A. Starkey, Keith Horne, C.~S. Kochanek, B.~M. Peterson, M.~C. Bentz, K.~D. Denney, C.~J. Grier, D. Grupe, R.~W. Pogge, G. De Rosa, S.~M. Adams, A.~J. Barth, Thomas G. Beatty, A. Bhattacharjee, G.~A. Borman, T.~A. Boroson, M.~C. Bottorff, Jacob E. Brown, Jonathan S. BrownM.~S. Brotherton, C.~T. Coker, S.~M. Crawford, K.~V. Croxall, Sarah Eftekharzadeh, Michael Eracleous, M.~D. Joner, C.~B. Henderson, T.~W. -S. Holoien, T. Hutchison, Shai Kaspi, S. Kim, Anthea L. King, Miao Li, Cassandra Lochhaas, Zhiyuan Ma, F. MacInnis, E.~R. Manne-Nicholas, M. Mason, Carmen Montuori, Ana Mosquera, Dale Mudd, R. Musso, S.~V. Nazarov, M.~L. Nguyen, D.~N. Okhmat, Christopher A. Onken, B. Ou- Yang, A. Pancoast, L. Pei, Matthew T. Penny, Radoslaw Poleski, Stephen Rafter, E. Romero- Colmenero, Jessie Runnoe, David J. Sand, Jaderson S. Schimoia, S.~G. Sergeev, B.~J. Shappee, Gregory V. Simonian, Garrett Somers, M. Spencer, Daniel J. Stevens, Jamie Tayar, T. Treu, Stefano Valenti, J. Van Saders, Jr. Villanueva S., C. Villforth, Yaniv Weiss, H. Winkler, W. Zhu

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Abstract

We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four months, with median cadences of 1.0 and 0.6 days for MCG+08-11-011 and NGC 2617, respectively, combined with roughly daily X-ray and near-UV data from Swift for NGC 2617. We find lags consistent with geometrically thin accretion-disk models that predict a lag-wavelength relation of τ ∝ λ 4/3. However, the observed lags are larger than predictions based on standard thin-disk theory by factors of 3.3 for MCG+08-11-011 and 2.3 for NGC 2617. These differences can be explained if the mass accretion rates are larger than inferred from the optical luminosity by a factor of 4.3 in MCG+08-11-011 and a factor of 1.3 in NGC 2617, although uncertainty in the SMBH masses determines the significance of this result. While the X-ray variability in NGC 2617 precedes the UV/optical variability, the long (2.6 day) lag is problematic for coronal reprocessing models.

Original language	English
Article number	107
Number of pages	1
Journal	Astrophysical Journal
Volume	854
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aaaa2b
Publication status	Published - 16 Feb 2018

Keywords

accretion, accretion disks, galaxies: individual: MCG+08-11-011, NGC 2617, galaxies: Seyfert, Astrophysics - Astrophysics of Galaxies

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10.3847/1538-4357/aaaa2b

1801.09692
Copyright © 2018 (The American Astronomical Society). The final publication is available at The Astrophysical Journal via https://doi.org/10.3847/1538-4357/aaaa2b.
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Fausnaugh, M. M., Starkey, D. A., Horne, K., Kochanek, C. S., Peterson, B. M., Bentz, M. C., Denney, K. D., Grier, C. J., Grupe, D., Pogge, R. W., De Rosa, G., Adams, S. M., Barth, A. J., Beatty, T. G., Bhattacharjee, A., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brown, J. E., ... Zhu, W. (2018). Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies. Astrophysical Journal, 854(2), Article 107. https://doi.org/10.3847/1538-4357/aaaa2b

Fausnaugh, MM, Starkey, DA, Horne, K, Kochanek, CS, Peterson, BM, Bentz, MC, Denney, KD, Grier, CJ, Grupe, D, Pogge, RW, De Rosa, G, Adams, SM, Barth, AJ, Beatty, TG, Bhattacharjee, A, Borman, GA, Boroson, TA, Bottorff, MC, Brown, JE, Brown, JS, Brotherton, MS, Coker, CT, Crawford, SM, Croxall, KV, Eftekharzadeh, S, Eracleous, M, Joner, MD, Henderson, CB, Holoien, TW-S, Hutchison, T, Kaspi, S, Kim, S, King, AL, Li, M, Lochhaas, C, Ma, Z, MacInnis, F, Manne-Nicholas, ER, Mason, M, Montuori, C, Mosquera, A, Mudd, D, Musso, R, Nazarov, SV, Nguyen, ML, Okhmat, DN, Onken, CA, Ou- Yang, B, Pancoast, A, Pei, L, Penny, MT, Poleski, R, Rafter, S, Romero- Colmenero, E, Runnoe, J, Sand, DJ, Schimoia, JS, Sergeev, SG, Shappee, BJ, Simonian, GV, Somers, G, Spencer, M, Stevens, DJ, Tayar, J, Treu, T, Valenti, S, Van Saders, J, Villanueva S., J, Villforth, C, Weiss, Y, Winkler, H & Zhu, W 2018, 'Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies', Astrophysical Journal, vol. 854, no. 2, 107. https://doi.org/10.3847/1538-4357/aaaa2b

@article{4f52f81090b14437b9a49491bcea1200,

title = "Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies",

abstract = "We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four months, with median cadences of 1.0 and 0.6 days for MCG+08-11-011 and NGC 2617, respectively, combined with roughly daily X-ray and near-UV data from Swift for NGC 2617. We find lags consistent with geometrically thin accretion-disk models that predict a lag-wavelength relation of τ ∝ λ 4/3. However, the observed lags are larger than predictions based on standard thin-disk theory by factors of 3.3 for MCG+08-11-011 and 2.3 for NGC 2617. These differences can be explained if the mass accretion rates are larger than inferred from the optical luminosity by a factor of 4.3 in MCG+08-11-011 and a factor of 1.3 in NGC 2617, although uncertainty in the SMBH masses determines the significance of this result. While the X-ray variability in NGC 2617 precedes the UV/optical variability, the long (2.6 day) lag is problematic for coronal reprocessing models.",

keywords = "accretion, accretion disks, galaxies: individual: MCG+08-11-011, NGC 2617, galaxies: Seyfert, Astrophysics - Astrophysics of Galaxies",

author = "M.~M. Fausnaugh and D.~A. Starkey and Keith Horne and C.~S. Kochanek and B.~M. Peterson and M.~C. Bentz and K.~D. Denney and C.~J. Grier and D. Grupe and R.~W. Pogge and {De Rosa}, G. and S.~M. Adams and A.~J. Barth and Beatty, {Thomas G.} and A. Bhattacharjee and G.~A. Borman and T.~A. Boroson and M.~C. Bottorff and Brown, {Jacob E.} and Brown, {Jonathan S.} and M.~S. Brotherton and C.~T. Coker and S.~M. Crawford and K.~V. Croxall and Sarah Eftekharzadeh and Michael Eracleous and M.~D. Joner and C.~B. Henderson and Holoien, {T.~W. -S.} and T. Hutchison and Shai Kaspi and S. Kim and King, {Anthea L.} and Miao Li and Cassandra Lochhaas and Zhiyuan Ma and F. MacInnis and E.~R. Manne-Nicholas and M. Mason and Carmen Montuori and Ana Mosquera and Dale Mudd and R. Musso and S.~V. Nazarov and M.~L. Nguyen and D.~N. Okhmat and Onken, {Christopher A.} and {Ou- Yang}, B. and A. Pancoast and L. Pei and Penny, {Matthew T.} and Radoslaw Poleski and Stephen Rafter and {Romero- Colmenero}, E. and Jessie Runnoe and Sand, {David J.} and Schimoia, {Jaderson S.} and S.~G. Sergeev and B.~J. Shappee and Simonian, {Gregory V.} and Garrett Somers and M. Spencer and Stevens, {Daniel J.} and Jamie Tayar and T. Treu and Stefano Valenti and {Van Saders}, J. and {Villanueva S.}, Jr. and C. Villforth and Yaniv Weiss and H. Winkler and W. Zhu",

year = "2018",

month = feb,

day = "16",

doi = "10.3847/1538-4357/aaaa2b",

language = "English",

volume = "854",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

number = "2",

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TY - JOUR

T1 - Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies

AU - Fausnaugh, M.~M.

AU - Starkey, D.~A.

AU - Horne, Keith

AU - Kochanek, C.~S.

AU - Peterson, B.~M.

AU - Bentz, M.~C.

AU - Denney, K.~D.

AU - Grier, C.~J.

AU - Grupe, D.

AU - Pogge, R.~W.

AU - De Rosa, G.

AU - Adams, S.~M.

AU - Barth, A.~J.

AU - Beatty, Thomas G.

AU - Bhattacharjee, A.

AU - Borman, G.~A.

AU - Boroson, T.~A.

AU - Bottorff, M.~C.

AU - Brown, Jacob E.

AU - Brown, Jonathan S.

AU - Brotherton, M.~S.

AU - Coker, C.~T.

AU - Crawford, S.~M.

AU - Croxall, K.~V.

AU - Eftekharzadeh, Sarah

AU - Eracleous, Michael

AU - Joner, M.~D.

AU - Henderson, C.~B.

AU - Holoien, T.~W. -S.

AU - Hutchison, T.

AU - Kaspi, Shai

AU - Kim, S.

AU - King, Anthea L.

AU - Li, Miao

AU - Lochhaas, Cassandra

AU - Ma, Zhiyuan

AU - MacInnis, F.

AU - Manne-Nicholas, E.~R.

AU - Mason, M.

AU - Montuori, Carmen

AU - Mosquera, Ana

AU - Mudd, Dale

AU - Musso, R.

AU - Nazarov, S.~V.

AU - Nguyen, M.~L.

AU - Okhmat, D.~N.

AU - Onken, Christopher A.

AU - Ou- Yang, B.

AU - Pancoast, A.

AU - Pei, L.

AU - Penny, Matthew T.

AU - Poleski, Radoslaw

AU - Rafter, Stephen

AU - Romero- Colmenero, E.

AU - Runnoe, Jessie

AU - Sand, David J.

AU - Schimoia, Jaderson S.

AU - Sergeev, S.~G.

AU - Shappee, B.~J.

AU - Simonian, Gregory V.

AU - Somers, Garrett

AU - Spencer, M.

AU - Stevens, Daniel J.

AU - Tayar, Jamie

AU - Treu, T.

AU - Valenti, Stefano

AU - Van Saders, J.

AU - Villanueva S., Jr.

AU - Villforth, C.

AU - Weiss, Yaniv

AU - Winkler, H.

AU - Zhu, W.

PY - 2018/2/16

Y1 - 2018/2/16

N2 - We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four months, with median cadences of 1.0 and 0.6 days for MCG+08-11-011 and NGC 2617, respectively, combined with roughly daily X-ray and near-UV data from Swift for NGC 2617. We find lags consistent with geometrically thin accretion-disk models that predict a lag-wavelength relation of τ ∝ λ 4/3. However, the observed lags are larger than predictions based on standard thin-disk theory by factors of 3.3 for MCG+08-11-011 and 2.3 for NGC 2617. These differences can be explained if the mass accretion rates are larger than inferred from the optical luminosity by a factor of 4.3 in MCG+08-11-011 and a factor of 1.3 in NGC 2617, although uncertainty in the SMBH masses determines the significance of this result. While the X-ray variability in NGC 2617 precedes the UV/optical variability, the long (2.6 day) lag is problematic for coronal reprocessing models.

AB - We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four months, with median cadences of 1.0 and 0.6 days for MCG+08-11-011 and NGC 2617, respectively, combined with roughly daily X-ray and near-UV data from Swift for NGC 2617. We find lags consistent with geometrically thin accretion-disk models that predict a lag-wavelength relation of τ ∝ λ 4/3. However, the observed lags are larger than predictions based on standard thin-disk theory by factors of 3.3 for MCG+08-11-011 and 2.3 for NGC 2617. These differences can be explained if the mass accretion rates are larger than inferred from the optical luminosity by a factor of 4.3 in MCG+08-11-011 and a factor of 1.3 in NGC 2617, although uncertainty in the SMBH masses determines the significance of this result. While the X-ray variability in NGC 2617 precedes the UV/optical variability, the long (2.6 day) lag is problematic for coronal reprocessing models.

KW - accretion, accretion disks, galaxies: individual: MCG+08-11-011, NGC 2617, galaxies: Seyfert, Astrophysics - Astrophysics of Galaxies

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U2 - 10.3847/1538-4357/aaaa2b

DO - 10.3847/1538-4357/aaaa2b

M3 - Article

SN - 0004-637X

VL - 854

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 107

ER -

Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies

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