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, Radosław 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, S. Villanueva, C. Villforth, Yaniv Weiss, H. Winkler, W. Zhu

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 languageEnglish (US)
Article number107
JournalAstrophysical Journal
Volume854
Issue number2
DOIs
StatePublished - Feb 20 2018

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reverberation
accretion disks
time lag
accretion
galaxies
continuums
filter
wavelength
prediction
light curve
x rays
luminosity
filters
predictions
wavelengths
rate
reprocessing
monitoring data

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fausnaugh, M. M., Starkey, D. A., Horne, K., Kochanek, C. S., Peterson, B. M., Bentz, M. C., ... Zhu, W. (2018). Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies. Astrophysical Journal, 854(2), [107]. https://doi.org/10.3847/1538-4357/aaaa2b
Fausnaugh, M. M. ; Starkey, D. A. ; Horne, Keith ; 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, Thomas G. ; Bhattacharjee, A. ; Borman, G. A. ; Boroson, T. A. ; Bottorff, M. C. ; Brown, Jacob E. ; Brown, Jonathan S. ; Brotherton, M. S. ; Coker, C. T. ; Crawford, S. M. ; Croxall, K. V. ; Eftekharzadeh, Sarah ; Eracleous, Michael ; Joner, M. D. ; Henderson, C. B. ; Holoien, T. W.S. ; Hutchison, T. ; Kaspi, Shai ; Kim, S. ; King, Anthea L. ; Li, Miao ; Lochhaas, Cassandra ; Ma, Zhiyuan ; Macinnis, F. ; Manne-Nicholas, E. R. ; Mason, M. ; Montuori, Carmen ; Mosquera, Ana ; Mudd, Dale ; Musso, R. ; Nazarov, S. V. ; Nguyen, M. L. ; Okhmat, D. N. ; Onken, Christopher A. ; Ou-Yang, B. ; Pancoast, A. ; Pei, L. ; Penny, Matthew T. ; Poleski, Radosław ; Rafter, Stephen ; Romero-Colmenero, E. ; Runnoe, Jessie ; Sand, David J. ; Schimoia, Jaderson S. ; Sergeev, S. G. ; Shappee, B. J. ; Simonian, Gregory V. ; Somers, Garrett ; Spencer, M. ; Stevens, Daniel J. ; Tayar, Jamie ; Treu, T. ; Valenti, Stefano ; Van Saders, J. ; Villanueva, S. ; Villforth, C. ; Weiss, Yaniv ; Winkler, H. ; Zhu, W. / Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies. In: Astrophysical Journal. 2018 ; Vol. 854, No. 2.
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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.",
author = "Fausnaugh, {M. M.} and Starkey, {D. A.} and Keith Horne and Kochanek, {C. S.} and Peterson, {B. M.} and Bentz, {M. C.} and Denney, {K. D.} and Grier, {C. J.} and D. Grupe and Pogge, {R. W.} and {De Rosa}, G. and Adams, {S. M.} and Barth, {A. J.} and Beatty, {Thomas G.} and A. Bhattacharjee and Borman, {G. A.} and Boroson, {T. A.} and Bottorff, {M. C.} and Brown, {Jacob E.} and Brown, {Jonathan S.} and Brotherton, {M. S.} and Coker, {C. T.} and Crawford, {S. M.} and Croxall, {K. V.} and Sarah Eftekharzadeh and Michael Eracleous and Joner, {M. D.} and Henderson, {C. B.} 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 Manne-Nicholas, {E. R.} and M. Mason and Carmen Montuori and Ana Mosquera and Dale Mudd and R. Musso and Nazarov, {S. V.} and Nguyen, {M. L.} and Okhmat, {D. N.} and Onken, {Christopher A.} and B. Ou-Yang and A. Pancoast and L. Pei and Penny, {Matthew T.} and Radosław Poleski and Stephen Rafter and E. Romero-Colmenero and Jessie Runnoe and Sand, {David J.} and Schimoia, {Jaderson S.} and Sergeev, {S. G.} and Shappee, {B. J.} 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 S. Villanueva and C. Villforth and Yaniv Weiss and H. Winkler and W. Zhu",
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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, TWS, 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, 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

Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies. / Fausnaugh, M. M.; Starkey, D. A.; Horne, Keith; 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, Thomas G.; Bhattacharjee, A.; Borman, G. A.; Boroson, T. A.; Bottorff, M. C.; Brown, Jacob E.; Brown, Jonathan S.; Brotherton, M. S.; Coker, C. T.; Crawford, S. M.; Croxall, K. V.; Eftekharzadeh, Sarah; Eracleous, Michael; Joner, M. D.; Henderson, C. B.; Holoien, T. W.S.; Hutchison, T.; Kaspi, Shai; Kim, S.; King, Anthea L.; Li, Miao; Lochhaas, Cassandra; Ma, Zhiyuan; Macinnis, F.; Manne-Nicholas, E. R.; Mason, M.; Montuori, Carmen; Mosquera, Ana; Mudd, Dale; Musso, R.; Nazarov, S. V.; Nguyen, M. L.; Okhmat, D. N.; Onken, Christopher A.; Ou-Yang, B.; Pancoast, A.; Pei, L.; Penny, Matthew T.; Poleski, Radosław; Rafter, Stephen; Romero-Colmenero, E.; Runnoe, Jessie; Sand, David J.; Schimoia, Jaderson S.; Sergeev, S. G.; Shappee, B. J.; Simonian, Gregory V.; Somers, Garrett; Spencer, M.; Stevens, Daniel J.; Tayar, Jamie; Treu, T.; Valenti, Stefano; Van Saders, J.; Villanueva, S.; Villforth, C.; Weiss, Yaniv; Winkler, H.; Zhu, W.

In: Astrophysical Journal, Vol. 854, No. 2, 107, 20.02.2018.

Research output: Contribution to journalArticle

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, Radosław

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.

AU - Villforth, C.

AU - Weiss, Yaniv

AU - Winkler, H.

AU - Zhu, W.

PY - 2018/2/20

Y1 - 2018/2/20

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.

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Fausnaugh MM, Starkey DA, Horne K, Kochanek CS, Peterson BM, Bentz MC et al. Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies. Astrophysical Journal. 2018 Feb 20;854(2). 107. https://doi.org/10.3847/1538-4357/aaaa2b