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29 March 2024
 
  » arxiv » 1510.5648

 Article overview


Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band 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. Schnulle ; S. G. Sergeev ; M. Vestergaard ; W.-K. Zheng ; M. D. Anderson ; P. Arevalo ; C. Bazhaw ; G. A. Borman ; T. A. Boroson ; W. N. Brandt ; A. A. Breeveld ; B. J. Brewer ; E. M. Cackett ; D. M. Crenshaw ; E. Dalla Bonta ; A. De Lorenzo-Caceres ; 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 ; J. A. Kennea ; S. C. Kim ; K. T. Korista ; G. A. Kriss ; V. M. Larionov ; 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 ; 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 ; M. 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 ; Y. Zu ;
Date 19 Oct 2015
AbstractWe present ground-based optical photometric monitoring data for NGC 5548, part of an extended multi-wavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters ($BVRI$ and $ugriz$). Combined with UV 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 $1158,{ m AA}$ to the $z$-band ($sim! 9160,{ m AA}$). 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 HeII$lambda 1640$ and $lambda 4686$), suggesting that the continuum emitting source is of a physical size comparable to the inner broad line region. The trend of lag with wavelength is broadly consistent with the prediction for continuum reprocessing by an accretion disk with $ au propto lambda^{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 = 0.1L_{ m Edd}$). Using optical spectra from the Large Binocular Telescope, we estimate the bias of the inter-band continuum lags due to broad line region emission observed in the filters. We find that the bias for filters with high levels of BLR contamination ($sim! 20\%$) can be important for the shortest continuum lags, and likely has a significant impact on the $u$ and $U$ bands due to Balmer continuum emission.
Source arXiv, 1510.5648
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