Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy

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dc.contributor.authorMathur, S.
dc.contributor.authorGupta, A.
dc.contributor.authorPage, K.
dc.contributor.authorPogge, R. W.
dc.contributor.authorKrongold, Y.
dc.contributor.authorGoad, M. R.
dc.contributor.authorAdams, S. M.
dc.contributor.authorAnderson, M. D.
dc.contributor.authorArevalo, P.
dc.contributor.authorBarth, A. J.
dc.contributor.authorBazhaw, C.
dc.contributor.authorBeatty, T. G.
dc.contributor.authorBentz, M. C.
dc.contributor.authorBigley, A.
dc.contributor.authorBisogni, S.
dc.contributor.authorBorman, G. A.
dc.contributor.authorBoroson, T. A.
dc.contributor.authorBottorff, M. C.
dc.contributor.authorBrandt, W. N.
dc.contributor.authorBreeveld, A. A.
dc.contributor.authorBrown, J. E.
dc.contributor.authorBrown, J. S.
dc.contributor.authorCackett, E. M.
dc.contributor.authorCanalizo, G.
dc.contributor.authorCarini, M. T.
dc.contributor.authorClubb, K. I.
dc.contributor.authorComerford, J. M.
dc.contributor.authorCoker, C. T.
dc.contributor.authorCorsini, E. M.
dc.contributor.authorCrenshaw, D. M.
dc.contributor.authorCroft, S.
dc.contributor.authorCroxall, K. V.
dc.contributor.authorDalla Bonta, E.
dc.contributor.authorDeason, A. J.
dc.contributor.authorDenney, K. D.
dc.contributor.authorDe Lorenzo Caceres, A.
dc.contributor.authorDe Rosa, G.
dc.contributor.authorDietrich, M.
dc.contributor.authorEdelson, R.
dc.contributor.authorEly, J.
dc.contributor.authorEracleous, M.
dc.contributor.authorEvans, P. A.
dc.contributor.authorFausnaugh, M. M.
dc.contributor.authorFerland, G. J.
dc.contributor.authorFilippenko, A. V.
dc.contributor.authorFlatland, K.
dc.contributor.authorFox, O. D.
dc.contributor.authorGates, E. L.
dc.contributor.authorGehrels, N.
dc.contributor.authorGeier, S.
dc.contributor.authorGelbord, J. M.
dc.contributor.authorGorjian, V.
dc.contributor.authorGreene, J. E.
dc.contributor.authorGrier, C. J.
dc.contributor.authorGrupe, D.
dc.contributor.authorHall, P. B.
dc.contributor.authorHenderson, C. B.
dc.contributor.authorHicks, S.
dc.contributor.authorHolmbeck, E.
dc.contributor.authorHoloien, T. W. S.
dc.contributor.authorHorenstein, D.
dc.contributor.authorHorne, Keith
dc.contributor.authorHutchison, T.
dc.contributor.authorIm, M.
dc.contributor.authorJensen, J. J.
dc.contributor.authorJohnson, C. A.
dc.contributor.authorJoner, M. D.
dc.contributor.authorJones, J.
dc.contributor.authorKaastra, J.
dc.contributor.authorKaspi, S.
dc.contributor.authorKelly, B. C.
dc.contributor.authorKelly, P. L.
dc.contributor.authorKennea, J. A.
dc.contributor.authorKim, M.
dc.contributor.authorKim, S.
dc.contributor.authorKim, S. C.
dc.contributor.authorKing, A.
dc.contributor.authorKlimanov, S. A.
dc.contributor.authorKochanek, C. S.
dc.contributor.authorKorista, K. T.
dc.contributor.authorKriss, G. A.
dc.contributor.authorLau, M. W.
dc.contributor.authorLee, J. C.
dc.contributor.authorLeonard, D. C.
dc.contributor.authorLi, M.
dc.contributor.authorLira, P.
dc.contributor.authorMa, Z.
dc.contributor.authorMacInnis, F.
dc.contributor.authorManne Nicholas, E. R.
dc.contributor.authorMalkan, M. A.
dc.contributor.authorMauerhan, J. C.
dc.contributor.authorMcGurk, R.
dc.contributor.authorMcHardy, I. M.
dc.contributor.authorMontouri, C.
dc.contributor.authorMorelli, L.
dc.contributor.authorMosquera, A.
dc.contributor.authorMudd, D.
dc.contributor.authorMuller Sanchez, F.
dc.contributor.authorMusso, R.
dc.contributor.authorNazarov, S. V.
dc.contributor.authorNetzer, H.
dc.contributor.authorNguyen, M. L.
dc.contributor.authorNorris, R. P.
dc.contributor.authorNousek, J. A.
dc.contributor.authorOchner, P.
dc.contributor.authorOkhmat, D. N.
dc.contributor.authorOu Yang, B.
dc.contributor.authorPancoast, A.
dc.contributor.authorPapadakis, I.
dc.contributor.authorParks, J. R.
dc.contributor.authorPei, L.
dc.contributor.authorPeterson, B. M.
dc.contributor.authorPizzella, A.
dc.contributor.authorPoleski, R.
dc.contributor.authorPott, J. U.
dc.contributor.authorRafter, S. E.
dc.contributor.authorRix, H. W.
dc.contributor.authorRunnoe, J.
dc.contributor.authorSaylor, D. A.
dc.contributor.authorSchimoia, J. S.
dc.contributor.authorSchnuelle, K.
dc.contributor.authorSergeev, S. G.
dc.contributor.authorShappee, B. J.
dc.contributor.authorShivvers, I.
dc.contributor.authorSiegel, M.
dc.contributor.authorSimonian, G. V.
dc.contributor.authorSiviero, A.
dc.contributor.authorSkielboe, A.
dc.contributor.authorSomers, G.
dc.contributor.authorSpencer, M.
dc.contributor.authorStarkey, D.
dc.contributor.authorStevens, D. J.
dc.contributor.authorSung, H. I.
dc.contributor.authorTayar, J.
dc.contributor.authorTejos, N.
dc.contributor.authorTurner, C. S.
dc.contributor.authorUttley, P.
dc.contributor.authorVan Saders, J.
dc.contributor.authorVestergaard, M.
dc.contributor.authorVican, L.
dc.contributor.authorVillanueva, S., Jr.
dc.contributor.authorVillforth, C.
dc.contributor.authorWeiss, Y.
dc.contributor.authorWoo, J. H.
dc.contributor.authorYan, H.
dc.contributor.authorYoung, S.
dc.contributor.authorYuk, H.
dc.contributor.authorZheng, W.
dc.contributor.authorZhu, W.
dc.contributor.authorZu, Y.
dc.date.accessioned2024-01-10T14:21:42Z
dc.date.available2024-01-10T14:21:42Z
dc.date.issued2017
dc.description.abstractDuring the Space Telescope and Optical Reverberation Mapping Project observations of NGC 5548, the continuum and emission-line variability became decorrelated during the second half of the six-month-long observing campaign. Here we present Swift and Chandra X-ray spectra of NGC 5548 obtained as part of the campaign. The Swift spectra show that excess flux (relative to a power-law continuum) in the soft X-ray band appears before the start of the anomalous emission-line behavior, peaks during the period of the anomaly, and then declines. This is a model-independent result suggesting that the soft excess is related to the anomaly. We divide the Swift data into on-and off-anomaly spectra to characterize the soft excess via spectral fitting. The cause of the spectral differences is likely due to a change in the intrinsic spectrum rather than to variable obscuration or partial covering. The Chandra spectra have lower signal-to-noise ratios, but are consistent with the Swift data. Our preferred model of the soft excess is emission from an optically thick, warm Comptonizing corona, the effective optical depth of which increases during the anomaly. This model simultaneously explains all three observations: the UV emission-line flux decrease, the soft-excess increase, and the emission-line anomaly.
dc.description.funderNational Aeronautics and Space Administration (NASA) through Chandra by the Chandra X-ray Observatory Center
dc.description.funderNASA
dc.description.funderNASA through a grant from the Space Telescope Science Institute
dc.description.funderNSF
dc.description.funderSTFC
dc.description.funderUK Space Agency
dc.description.funderTABASGO Foundation
dc.description.funderChristopher R. Redlich Fund
dc.description.funderCONACYT
dc.description.funderScience and Technology Facilities Council
dc.description.funderUK Space Agency
dc.description.funderDirect For Mathematical & Physical Scien
dc.description.funderDivision Of Astronomical Sciences
dc.fechaingreso.objetodigital2024-05-30
dc.format.extent9 páginas
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/aa832b
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/aa832b
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79757
dc.identifier.wosidWOS:000409527500005
dc.information.autorucFísica;Tejos N;S/I;1040238
dc.issue.numero1
dc.language.isoen
dc.nota.accesoContenido parcial
dc.publisherIOP PUBLISHING LTD
dc.revistaASTROPHYSICAL JOURNAL
dc.rightsacceso restringido
dc.subjectgalaxies: active
dc.subjectgalaxies: individual (NGC 5548)
dc.subjectX-rays: galaxies
dc.subjectX-rays: individual (NGC 5548)
dc.subjectACTIVE GALACTIC NUCLEI
dc.subjectWARM ABSORBER
dc.subjectXMM-NEWTON
dc.subjectABSORPTION-LINES
dc.subjectSEYFERT-1
dc.subjectGALAXY
dc.subjectNGC-5548
dc.subjectMR-2251-178
dc.subjectDISCOVERY
dc.subjectNGC-3783
dc.titleSpace Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy
dc.typeartículo
dc.volumen846
sipa.codpersvinculados1040238
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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