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  5. SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION AND BROADBAND TIME DELAYS IN NGC 5548

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Article
en
2016

SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION AND BROADBAND TIME DELAYS IN NGC 5548

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en
2016
Vol 821 (1)
Vol. 821
DOI: 10.3847/0004-637x/821/1/56

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Alexei V Filippenko
Alexei V Filippenko

University of California, Berkeley

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Michael Fausnaugh
K. D. Denney
Aaron J. Barth
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Abstract

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 λ 1640 and λ 4686 ), 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 = 0.1 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.

How to cite this publication

Michael Fausnaugh, K. D. Denney, Aaron J. Barth, Misty C. Bentz, M. C. Bottorff, M. T. Carini, K. V. Croxall, Gisella De Rosa, M. R. Goad, Keith Horne, M. D. Joner, S. Kaspi, Minjin Kim, S. A. Klimanov, C. S. Kochanek, Douglas C. Leonard, H. Netzer, B. M. Peterson, K. Schnülle, С. Г. Сергеев, M. Vestergaard, WeiKang Zheng, Ying Zu, Matthew Anderson, P. Arévalo, C. Bazhaw, Г. А. Борман, Todd A. Boroson, W. N. Brandt, A. A. Breeveld, B. J. Brewer, Edward M. Cackett, D. M. Crenshaw, E. Dalla Bontà, A. de Lorenzo-Cáceres, M. Dietrich, Rick Edelson, Н. В. Ефимова, Justin Ely, P. A. Evans, Alexei V Filippenko, K. Flatland, N. Gehrels, S. Geier, J. M. Gelbord, L. González, Varoujan Gorjian, C. J. Grier, D. Grupe, Patrick B. Hall, S. Hicks, D. Horenstein, Taylor A. Hutchison, Myungshin Im, J. J. Jensen, Jeremy Jones, J. S. Kaastra, Brandon C. Kelly, J. 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, J. A. Nousek, D. N. Okhmat, Anna Pancoast, I. E. Papadakis, J. R. Parks, L. Pei, Richard W. Pogge, Jörg‐Uwe Pott, S. E. Rafter, Hans‐Walter Rix, D. A. Saylor, J. S. Schimoia, M. H. Siegel, M. Spencer, D. Starkey, Hyun-Il Sung, K. G. Teems, Tommaso Treu, C. S. Turner, P. Uttley, C. Villforth, Y. Weiss, Jong-Hak Woo, Haojing Yan, S. Young (2016). SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION AND BROADBAND TIME DELAYS IN NGC 5548. , 821(1), DOI: https://doi.org/10.3847/0004-637x/821/1/56.

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Publication Details

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Article

Year

2016

Authors

97

Datasets

0

Total Files

0

Language

en

DOI

https://doi.org/10.3847/0004-637x/821/1/56

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