Swift Monitoring of NGC 4151: Evidence for a Second X-Ray/UV Reprocessing

@article{Edelson2017SwiftMO,
  title={Swift Monitoring of NGC 4151: Evidence for a Second X-Ray/UV Reprocessing},
  author={Richard Allen Edelson and Jonathan M. Gelbord and Edward M. Cackett and S. D. Connolly and C. Done and Michael M. Fausnaugh and Emma Gardner and Neil A. Gehrels and M. R. Goad and Keith Horne and Ian M. McHardy and Bradley M. Peterson and Simon Vaughan and Marianne Vestergaard and A. A. Breeveld and Aaron J. Barth and Misty C. Bentz and Mark Clinton Bottorff and William N. Brandt and Steven M. Crawford and Elena Dalla Bont{\`a} and D. Emmanoulopoulos and P. A. Evans and R. Figuera Jaimes and Alexei V. Filippenko and Gary J. Ferland and Dirk Grupe and Michael D. Joner and Jamie A. Kennea and Kirk T. Korista and H A Krimm and Gerard A. Kriss and Douglas C. Leonard and Smita Mathur and Hagai Netzer and J A Nousek and Kim L. Page and Encarni Romero-Colmenero and Michael H. Siegel and David Starkey and Tommaso Treu and H. Alexander Vogler and Hartmut Winkler and W. Zheng},
  journal={The Astrophysical Journal},
  year={2017},
  volume={840},
  pages={41-41}
}
NASA [NNX13AC26G, NNX13AC63G, NNX13AE99G, NNH13CH61C]; NSF [AST-1412693, AST-1253702, AST-1211916, AST-1009571, AST-1210311, AST-1412315]; STFC [ST/M001296/1]; National Research Foundation (NRF) of South Africa; UK Space Agency; TABASGO Foundation; Christopher R. Redlich Fund; Packard Foundation; Danish Council for Independent Research [DFF 4002-00275] 
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ACF, AML and DJKB acknowledge support from the ERC Advanced Grant FEEDBACK 340442. WNA acknowledges support from the European Union Seventh Framework Programme (FP7/2013-2017) under grant agreement
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We have undertaken a new ground-based monitoring campaign to improve the estimates of the mass of the central black hole in NGC 4151. We measure the lag time of the broad H? line response compared to
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Space telescope and optical reverberation mapping project. II. Swift and HST reverberation mapping of the accretion disk of NGC 5548
Recent intensive Swift monitoring of the Seyfert 1 galaxy NGC 5548 yielded 282 usable epochs over 125 days across six UV/optical bands and the X-rays. This is the densest extended active galactic
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Summary. The Seyfert galaxy NGC 4151 harbors in its nucleus the most intensively studied AGN (Active Galactic Nucleus). Among the brightest AGN (in apparent luminosity) it is the most widely variable
The origin of the UV/optical lags in NGC 5548
The new multiwavelength monitoring campaign on NGC 5548 shows clearly that the variability of the ultraviolet (UV)/optical light curves lags by progressively longer times at longer wavelengths, as
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