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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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