Swift monitoring of NGC 4151: Evidence for a Second X-ray/UV Reprocessing

Swift monitoring of NGC 4151 with ~6 hr sampling over a total of 69 days in early 2016 is used to construct light curves covering five bands in the X-rays (0.3-50 keV) and six in the ultraviolet (UV)/optical (1900-5500 A). The three hardest X-ray bands (>2.5 keV) are all strongly correlated with...

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Bibliographic Details
Published in:arXiv.org 2017-04
Main Authors: Edelson, R, Gelbord, J, Cackett, E, Connolly, S, Done, C, Fausnaugh, M, Gardner, E, Gehrels, N, Goad, M, Horne, K, McHardy, I, Peterson, B M, Vaughan, S, Vestergaard, M, Breeveld, A, Barth, A J, Bentz, M, Bottorff, M, Brandt, W N, Crawford, S M, E Dalla Bonta, Emmanoulopoulos, D, Evans, P, R Figuera Jaimes, Filippenko, A V, Ferland, G, Grupe, D, Joner, M, Kennea, J, Korista, K T, Krimm, H A, Kriss, G, Leonard, D C, Mathur, S, Netzer, H, Nousek, J, Page, K, Romero-Colmenero, E, Siegel, M, Starkey, D A, Treu, T, Vogler, H A, Winkler, H, Zheng, W
Format: Article
Language:English
Subjects:
Accretion disks
Correlation analysis
Light curve
Monitoring
Reprocessing
X-rays
Online Access:Get full text
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Summary:Swift monitoring of NGC 4151 with ~6 hr sampling over a total of 69 days in early 2016 is used to construct light curves covering five bands in the X-rays (0.3-50 keV) and six in the ultraviolet (UV)/optical (1900-5500 A). The three hardest X-ray bands (>2.5 keV) are all strongly correlated with no measurable interband lag while the two softer bands show lower variability and weaker correlations. The UV/optical bands are significantly correlated with the X-rays, lagging ~3-4 days behind the hard X-rays. The variability within the UV/optical bands is also strongly correlated, with the UV appearing to lead the optical by ~0.5-1 day. This combination of >~3 day lags between the X-rays and UV and
ISSN:2331-8422
DOI:10.48550/arxiv.1703.06901