On the Nature of the High-Energy Rollover in 1H 0419-577

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dc.contributor.authorTurner, T, J.
dc.contributor.authorReeves, J. N.
dc.contributor.authorBraito, V,
dc.contributor.authorCosta, M.
dc.date.accessioned2018-02-19T15:52:05Z
dc.date.available2018-02-19T15:52:05Z
dc.date.issued2018
dc.description.abstractA NuSTAR/Swift observation of the luminous Seyfert 1 galaxy 1H 0419-577 taken during 2015 reveals one of the most extreme high energy cut-offs observed to date from an AGN - an origin due to thermal Comptonization would imply a remarkably low coronal temperature kT ∼ 15 keV. The low energy peak of the spectrum in the hard X-ray NuSTAR band, which peaks before the expected onset of a Compton hump, rules out strong reflection as the origin of the hard excess in this AGN. We show the origin of the high energy rollover is likely due to a combination of both thermal Comptonization and a intrinsically steeper continuum, which is modified by absorption at lower energies. Furthermore, modeling the broadband XUV continuum shape as a colour-corrected accretion disc, requires the presence of a variable warm absorber to explain all flux and spectral states of the source, consistent with the previous work on this AGN. While absorber variations produce marked spectral variability in this AGN, consideration of all flux states allows us to isolate a colourless component of variability that may arise from changes in the inner accretion flow, typically at around 10 rg.en_US
dc.description.urihttps://arxiv.org/pdf/1802.00795.pdfen_US
dc.format.extent14 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/M25M6285H
dc.identifier.citationMonthly Notices of the Royal Astronomical Societyen_US
dc.identifier.urihttp://hdl.handle.net/11603/7799
dc.language.isoen_USen_US
dc.publisherOxford Academicen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Physics Department
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author.
dc.subjectNuSTAR/Swift observationen_US
dc.subjectgalaxiesen_US
dc.subject1H 0419-577en_US
dc.subjectSeyfert galaxyen_US
dc.titleOn the Nature of the High-Energy Rollover in 1H 0419-577en_US
dc.typeTexten_US

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