Show simple item record

Files in this item


Item metadata

dc.contributor.authorEdelson, R.
dc.contributor.authorGelbord, J. M.
dc.contributor.authorHorne, K.
dc.contributor.authorMcHardy, I. M.
dc.contributor.authorPeterson, B. M.
dc.contributor.authorArevalo, P.
dc.contributor.authorBreeveld, A. A.
dc.contributor.authorDe Rosa, G.
dc.contributor.authorEvans, P. A.
dc.contributor.authorGoad, M. R.
dc.contributor.authorKriss, G. A.
dc.contributor.authorBrandt, W. N.
dc.contributor.authorGehrels, N.
dc.contributor.authorGrupe, D.
dc.contributor.authorKennea, J. A.
dc.contributor.authorKochanek, C. S.
dc.contributor.authorNousek, J. A.
dc.contributor.authorPapadakis, I.
dc.contributor.authorSiegel, M.
dc.contributor.authorStarkey, D.
dc.contributor.authorUttley, P.
dc.contributor.authorVaughan, S.
dc.contributor.authorYoung, S.
dc.contributor.authorBarth, A. J.
dc.contributor.authorBentz, M. C.
dc.contributor.authorBrewer, B. J.
dc.contributor.authorCrenshaw, D. M.
dc.contributor.authorDalla Bontà, E.
dc.contributor.authorDe Lorenzo-Caceres, A.
dc.contributor.authorDenney, K. D.
dc.contributor.authorDietrich, M.
dc.contributor.authorEly, J.
dc.contributor.authorFausnaugh, M. M.
dc.contributor.authorGrier, C. J.
dc.contributor.authorHall, P. B.
dc.contributor.authorKaastra, J.
dc.contributor.authorKelly, B. C.
dc.contributor.authorKorista, K. T.
dc.contributor.authorLira, P.
dc.contributor.authorMathur, S.
dc.contributor.authorNetzer, H.
dc.contributor.authorPancoast, A.
dc.contributor.authorPei, L.
dc.contributor.authorPogge, R. W.
dc.contributor.authorSchimoia, J. S.
dc.contributor.authorTreu, T.
dc.contributor.authorVestergaard, M.
dc.contributor.authorVillforth, C.
dc.contributor.authorYan, H.
dc.contributor.authorZu, Y.
dc.identifier.citationEdelson , R , Gelbord , J M , Horne , K , McHardy , I M , Peterson , B M , Arevalo , P , Breeveld , A A , De Rosa , G , Evans , P A , Goad , M R , Kriss , G A , Brandt , W N , Gehrels , N , Grupe , D , Kennea , J A , Kochanek , C S , Nousek , J A , Papadakis , I , Siegel , M , Starkey , D , Uttley , P , Vaughan , S , Young , S , Barth , A J , Bentz , M C , Brewer , B J , Crenshaw , D M , Dalla Bontà , E , De Lorenzo-Caceres , A , Denney , K D , Dietrich , M , Ely , J , Fausnaugh , M M , Grier , C J , Hall , P B , Kaastra , J , Kelly , B C , Korista , K T , Lira , P , Mathur , S , Netzer , H , Pancoast , A , Pei , L , Pogge , R W , Schimoia , J S , Treu , T , Vestergaard , M , Villforth , C , Yan , H & Zu , Y 2015 , ' Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST reverberation mapping of the accretion disk of NGC 5548 ' , Astrophysical Journal , vol. 806 , no. 1 , 129 .
dc.description.abstractRecent 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 nucleus (AGN) UV/optical continuum sampling ever obtained, with a mean sampling rate <0.5 day. Approximately daily Hubble Space Telescope UV sampling was also obtained. The UV/optical light curves show strong correlations (rmax = 0.57 - 0.90) and the clearest measurement to date of interband lags. These lags are well-fit by τ ∝ λ4/3 a wavelength dependence, with a normalization that indicates an unexpectedly large disk radius of ~0.35 ± 0.05 lt-day at 1367 Å, assuming a simple face-on model. The U band shows a marginally larger lag than expected from the fit and surrounding bands, which could be due to Balmer continuum emission from the broad-line region as suggested by Korista and Goad. The UV/X-ray correlation is weaker (rmax < 0.45) and less consistent over time. This indicates that while Swift is beginning to measure UV/optical lags in general agreement with accretion disk theory (although the derived size is larger than predicted), the relationship with X-ray variability is less well understood. Combining this accretion disk size estimate with those from quasar microlensing studies suggests that AGN disk sizes scale approximately linearly with central black hole mass over a wide range of masses.
dc.relation.ispartofAstrophysical Journalen
dc.subjectGalaxies: activeen
dc.subjectGalaxies: individual (NGC 5548)en
dc.subjectGalaxies: nucleien
dc.subjectGalaxies: Seyferten
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleSpace Telescope and Optical Reverberation Mapping Project. II. Swift and HST reverberation mapping of the accretion disk of NGC 5548en
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

This item appears in the following Collection(s)

Show simple item record