SPACE TELESCOPE and OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION and BROADBAND TIME DELAYS in NGC 5548

M. M. Fausnaugh, K. D. Denney, A. J. Barth, M. C. Bentz, M. C. Bottorff, M. T. Carini, K. V. Croxall, G. De Rosa, M. R. Goad, Keith Horne, M. D. Joner, S. Kaspi, M. Kim, S. A. Klimanov, C. S. Kochanek, D. C. Leonard, H. Netzer, B. M. Peterson, K. Schnülle, S. G. Sergeev & 77 others M. Vestergaard, W. K. Zheng, Y. Zu, M. D. Anderson, P. Arévalo, C. Bazhaw, G. A. Borman, T. A. Boroson, William Nielsen Brandt, A. A. Breeveld, B. J. Brewer, E. M. Cackett, D. M. Crenshaw, Elena Dalla Bontà, A. De Lorenzo-Cáceres, M. Dietrich, R. Edelson, 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, J. Jones, J. Kaastra, B. C. Kelly, Jamie A. Kennea, S. C. Kim, K. T. Korista, G. A. Kriss, J. C. Lee, P. Lira, F. Macinnis, E. R. Manne-Nicholas, S. Mathur, I. M. McHardy, C. Montouri, R. Musso, S. V. Nazarov, R. P. Norris, John Andrew Nousek, D. N. Okhmat, A. Pancoast, I. Papadakis, J. R. Parks, L. Pei, R. W. Pogge, J. U. Pott, S. E. Rafter, H. W. Rix, D. A. Saylor, J. S. Schimoia, Michael Hiram Siegel, M. Spencer, D. Starkey, H. I. Sung, K. G. Teems, T. Treu, C. S. Turner, P. Uttley, C. Villforth, Y. Weiss, J. H. Woo, H. Yan, S. Young

Research output: Contribution to journalArticle

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Abstract

We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters (BVRI and ugriz). Combined with ultraviolet data from the Hubble Space Telescope and Swift, we confirm significant time delays between the continuum bands as a function of wavelength, extending the wavelength coverage from 1158 Å to the z band (∼9160 Å). We find that the lags at wavelengths longer than the V band are equal to or greater than the lags of high-ionization-state emission lines (such as He ii and λ1640 and λ4686), suggesting that the continuum-emitting source is of a physical size comparable to the inner broad-line region (BLR). The trend of lag with wavelength is broadly consistent with the prediction for continuum reprocessing by an accretion disk with τ ∝ λ 4 . However, the lags also imply a disk radius that is 3 times larger than the prediction from standard thin-disk theory, assuming that the bolometric luminosity is 10% of the Eddington luminosity (L = 0.1 L Edd ). Using optical spectra from the Large Binocular Telescope, we estimate the bias of the interband continuum lags due to BLR emission observed in the filters. We find that the bias for filters with high levels of BLR contamination (∼20%) can be important for the shortest continuum lags and likely has a significant impact on the u and U bands owing to Balmer continuum emission.

Original languageEnglish (US)
Article number56
JournalAstrophysical Journal
Volume821
Issue number1
DOIs
StatePublished - Apr 10 2016

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reverberation
time lag
continuums
wavelength
filter
filters
wavelengths
prediction
luminosity
ionization
accretion
extremely high frequencies
predictions
project
Hubble Space Telescope
accretion disks
light curve
optical spectrum
contamination
telescopes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fausnaugh, M. M., Denney, K. D., Barth, A. J., Bentz, M. C., Bottorff, M. C., Carini, M. T., ... Young, S. (2016). SPACE TELESCOPE and OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION and BROADBAND TIME DELAYS in NGC 5548. Astrophysical Journal, 821(1), [56]. https://doi.org/10.3847/0004-637X/821/1/56
Fausnaugh, M. M. ; Denney, K. D. ; Barth, A. J. ; Bentz, M. C. ; Bottorff, M. C. ; Carini, M. T. ; Croxall, K. V. ; Rosa, G. De ; Goad, M. R. ; Horne, Keith ; Joner, M. D. ; Kaspi, S. ; Kim, M. ; Klimanov, S. A. ; Kochanek, C. S. ; Leonard, D. C. ; Netzer, H. ; Peterson, B. M. ; Schnülle, K. ; Sergeev, S. G. ; Vestergaard, M. ; Zheng, W. K. ; Zu, Y. ; Anderson, M. D. ; Arévalo, P. ; Bazhaw, C. ; Borman, G. A. ; Boroson, T. A. ; Brandt, William Nielsen ; Breeveld, A. A. ; Brewer, B. J. ; Cackett, E. M. ; Crenshaw, D. M. ; Dalla Bontà, Elena ; De Lorenzo-Cáceres, A. ; Dietrich, M. ; Edelson, R. ; Efimova, N. V. ; Ely, J. ; Evans, P. A. ; Filippenko, A. V. ; Flatland, K. ; Gehrels, N. ; Geier, S. ; Gelbord, J. M. ; Gonzalez, L. ; Gorjian, V. ; Grier, C. J. ; Grupe, D. ; Hall, P. B. ; Hicks, S. ; Horenstein, D. ; Hutchison, T. ; Im, M. ; Jensen, J. J. ; Jones, J. ; Kaastra, J. ; Kelly, B. C. ; Kennea, Jamie A. ; Kim, S. C. ; Korista, K. T. ; Kriss, G. A. ; Lee, J. C. ; Lira, P. ; Macinnis, F. ; Manne-Nicholas, E. R. ; Mathur, S. ; McHardy, I. M. ; Montouri, C. ; Musso, R. ; Nazarov, S. V. ; Norris, R. P. ; Nousek, John Andrew ; Okhmat, D. N. ; Pancoast, A. ; Papadakis, I. ; Parks, J. R. ; Pei, L. ; Pogge, R. W. ; Pott, J. U. ; Rafter, S. E. ; Rix, H. W. ; Saylor, D. A. ; Schimoia, J. S. ; Siegel, Michael Hiram ; Spencer, M. ; Starkey, D. ; Sung, H. I. ; Teems, K. G. ; Treu, T. ; Turner, C. S. ; Uttley, P. ; Villforth, C. ; Weiss, Y. ; Woo, J. H. ; Yan, H. ; Young, S. / SPACE TELESCOPE and OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION and BROADBAND TIME DELAYS in NGC 5548. In: Astrophysical Journal. 2016 ; Vol. 821, No. 1.
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abstract = "We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters (BVRI and ugriz). Combined with ultraviolet data from the Hubble Space Telescope and Swift, we confirm significant time delays between the continuum bands as a function of wavelength, extending the wavelength coverage from 1158 {\AA} to the z band (∼9160 {\AA}). We find that the lags at wavelengths longer than the V band are equal to or greater than the lags of high-ionization-state emission lines (such as He ii and λ1640 and λ4686), suggesting that the continuum-emitting source is of a physical size comparable to the inner broad-line region (BLR). The trend of lag with wavelength is broadly consistent with the prediction for continuum reprocessing by an accretion disk with τ ∝ λ 4 . However, the lags also imply a disk radius that is 3 times larger than the prediction from standard thin-disk theory, assuming that the bolometric luminosity is 10{\%} of the Eddington luminosity (L = 0.1 L Edd ). Using optical spectra from the Large Binocular Telescope, we estimate the bias of the interband continuum lags due to BLR emission observed in the filters. We find that the bias for filters with high levels of BLR contamination (∼20{\%}) can be important for the shortest continuum lags and likely has a significant impact on the u and U bands owing to Balmer continuum emission.",
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Fausnaugh, MM, Denney, KD, Barth, AJ, Bentz, MC, Bottorff, MC, Carini, MT, Croxall, KV, Rosa, GD, Goad, MR, Horne, K, Joner, MD, Kaspi, S, Kim, M, Klimanov, SA, Kochanek, CS, Leonard, DC, Netzer, H, Peterson, BM, Schnülle, K, Sergeev, SG, Vestergaard, M, Zheng, WK, Zu, Y, Anderson, MD, Arévalo, P, Bazhaw, C, Borman, GA, Boroson, TA, Brandt, WN, Breeveld, AA, Brewer, BJ, Cackett, EM, Crenshaw, DM, Dalla Bontà, E, De Lorenzo-Cáceres, A, Dietrich, M, Edelson, R, 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, Jones, J, Kaastra, J, Kelly, BC, Kennea, JA, Kim, SC, Korista, KT, Kriss, GA, Lee, JC, 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, Papadakis, I, Parks, JR, Pei, L, Pogge, RW, Pott, JU, Rafter, SE, Rix, HW, Saylor, DA, Schimoia, JS, Siegel, MH, Spencer, M, Starkey, D, Sung, HI, Teems, KG, Treu, T, Turner, CS, Uttley, P, Villforth, C, Weiss, Y, Woo, JH, Yan, H & Young, S 2016, 'SPACE TELESCOPE and OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION and BROADBAND TIME DELAYS in NGC 5548', Astrophysical Journal, vol. 821, no. 1, 56. https://doi.org/10.3847/0004-637X/821/1/56

SPACE TELESCOPE and OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION and BROADBAND TIME DELAYS in NGC 5548. / Fausnaugh, M. M.; Denney, K. D.; Barth, A. J.; Bentz, M. C.; Bottorff, M. C.; Carini, M. T.; Croxall, K. V.; Rosa, G. De; Goad, M. R.; Horne, Keith; Joner, M. D.; Kaspi, S.; Kim, M.; Klimanov, S. A.; Kochanek, C. S.; Leonard, D. C.; Netzer, H.; Peterson, B. M.; Schnülle, K.; Sergeev, S. G.; Vestergaard, M.; Zheng, W. K.; Zu, Y.; Anderson, M. D.; Arévalo, P.; Bazhaw, C.; Borman, G. A.; Boroson, T. A.; Brandt, William Nielsen; Breeveld, A. A.; Brewer, B. J.; Cackett, E. M.; Crenshaw, D. M.; Dalla Bontà, Elena; De Lorenzo-Cáceres, A.; Dietrich, M.; Edelson, R.; Efimova, N. V.; Ely, J.; Evans, P. A.; Filippenko, A. V.; Flatland, K.; Gehrels, N.; Geier, S.; Gelbord, J. M.; Gonzalez, L.; Gorjian, V.; Grier, C. J.; Grupe, D.; Hall, P. B.; Hicks, S.; Horenstein, D.; Hutchison, T.; Im, M.; Jensen, J. J.; Jones, J.; Kaastra, J.; Kelly, B. C.; Kennea, Jamie A.; Kim, S. C.; Korista, K. T.; Kriss, G. A.; Lee, J. C.; Lira, P.; Macinnis, F.; Manne-Nicholas, E. R.; Mathur, S.; McHardy, I. M.; Montouri, C.; Musso, R.; Nazarov, S. V.; Norris, R. P.; Nousek, John Andrew; Okhmat, D. N.; Pancoast, A.; Papadakis, I.; Parks, J. R.; Pei, L.; Pogge, R. W.; Pott, J. U.; Rafter, S. E.; Rix, H. W.; Saylor, D. A.; Schimoia, J. S.; Siegel, Michael Hiram; Spencer, M.; Starkey, D.; Sung, H. I.; Teems, K. G.; Treu, T.; Turner, C. S.; Uttley, P.; Villforth, C.; Weiss, Y.; Woo, J. H.; Yan, H.; Young, S.

In: Astrophysical Journal, Vol. 821, No. 1, 56, 10.04.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - SPACE TELESCOPE and OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION and BROADBAND TIME DELAYS in NGC 5548

AU - Fausnaugh, M. M.

AU - Denney, K. D.

AU - Barth, A. J.

AU - Bentz, M. C.

AU - Bottorff, M. C.

AU - Carini, M. T.

AU - Croxall, K. V.

AU - Rosa, G. De

AU - Goad, M. R.

AU - Horne, Keith

AU - Joner, M. D.

AU - Kaspi, S.

AU - Kim, M.

AU - Klimanov, S. A.

AU - Kochanek, C. S.

AU - Leonard, D. C.

AU - Netzer, H.

AU - Peterson, B. M.

AU - Schnülle, K.

AU - Sergeev, S. G.

AU - Vestergaard, M.

AU - Zheng, W. K.

AU - Zu, Y.

AU - Anderson, M. D.

AU - Arévalo, P.

AU - Bazhaw, C.

AU - Borman, G. A.

AU - Boroson, T. A.

AU - Brandt, William Nielsen

AU - Breeveld, A. A.

AU - Brewer, B. J.

AU - Cackett, E. M.

AU - Crenshaw, D. M.

AU - Dalla Bontà, Elena

AU - De Lorenzo-Cáceres, A.

AU - Dietrich, M.

AU - Edelson, R.

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 - Jones, J.

AU - Kaastra, J.

AU - Kelly, B. C.

AU - Kennea, Jamie A.

AU - Kim, S. C.

AU - Korista, K. T.

AU - Kriss, G. A.

AU - Lee, J. 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, John Andrew

AU - Okhmat, D. N.

AU - Pancoast, A.

AU - Papadakis, I.

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 - Siegel, Michael Hiram

AU - Spencer, M.

AU - Starkey, D.

AU - Sung, H. I.

AU - Teems, K. G.

AU - Treu, T.

AU - Turner, C. S.

AU - Uttley, P.

AU - Villforth, C.

AU - Weiss, Y.

AU - Woo, J. H.

AU - Yan, H.

AU - Young, S.

PY - 2016/4/10

Y1 - 2016/4/10

N2 - We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters (BVRI and ugriz). Combined with ultraviolet data from the Hubble Space Telescope and Swift, we confirm significant time delays between the continuum bands as a function of wavelength, extending the wavelength coverage from 1158 Å to the z band (∼9160 Å). We find that the lags at wavelengths longer than the V band are equal to or greater than the lags of high-ionization-state emission lines (such as He ii and λ1640 and λ4686), suggesting that the continuum-emitting source is of a physical size comparable to the inner broad-line region (BLR). The trend of lag with wavelength is broadly consistent with the prediction for continuum reprocessing by an accretion disk with τ ∝ λ 4 . However, the lags also imply a disk radius that is 3 times larger than the prediction from standard thin-disk theory, assuming that the bolometric luminosity is 10% of the Eddington luminosity (L = 0.1 L Edd ). Using optical spectra from the Large Binocular Telescope, we estimate the bias of the interband continuum lags due to BLR emission observed in the filters. We find that the bias for filters with high levels of BLR contamination (∼20%) can be important for the shortest continuum lags and likely has a significant impact on the u and U bands owing to Balmer continuum emission.

AB - We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters (BVRI and ugriz). Combined with ultraviolet data from the Hubble Space Telescope and Swift, we confirm significant time delays between the continuum bands as a function of wavelength, extending the wavelength coverage from 1158 Å to the z band (∼9160 Å). We find that the lags at wavelengths longer than the V band are equal to or greater than the lags of high-ionization-state emission lines (such as He ii and λ1640 and λ4686), suggesting that the continuum-emitting source is of a physical size comparable to the inner broad-line region (BLR). The trend of lag with wavelength is broadly consistent with the prediction for continuum reprocessing by an accretion disk with τ ∝ λ 4 . However, the lags also imply a disk radius that is 3 times larger than the prediction from standard thin-disk theory, assuming that the bolometric luminosity is 10% of the Eddington luminosity (L = 0.1 L Edd ). Using optical spectra from the Large Binocular Telescope, we estimate the bias of the interband continuum lags due to BLR emission observed in the filters. We find that the bias for filters with high levels of BLR contamination (∼20%) can be important for the shortest continuum lags and likely has a significant impact on the u and U bands owing to Balmer continuum emission.

UR - http://www.scopus.com/inward/record.url?scp=84963955045&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84963955045&partnerID=8YFLogxK

U2 - 10.3847/0004-637X/821/1/56

DO - 10.3847/0004-637X/821/1/56

M3 - Article

VL - 821

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 56

ER -