Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/37105
Title: Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548
Authors: Fausnaugh, M. M.
Denney, K. D.
Barth, A. J.
Bentz, M. C.
Bottorff, M. C.
Carini, M. T.
Croxall, K. V.
De Rosa, G.
Goad, M. R.
Horne, K.
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, W. N.
Breeveld, A. A.
Brewer, B. J.
Cackett, E. M.
Crenshaw, D. M.
Dalla Bontà, E.
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, J. 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, J. A.
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, M.
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.
First Published: 2016
Publisher: American Astronomical Society
Citation: Astrophysical Journal Letters
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 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 4/3 . 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 = 0.1LEdd). 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.
DOI Link: TBA
ISSN: 2041-8205
eISSN: 2041-8213
Links: TBA
http://hdl.handle.net/2381/37105
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: http://creativecommons.org/licenses/by-nc-nd/4.0/
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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