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dc.contributor.authorXu, Yerong
dc.contributor.authorGarcía, Javier A.
dc.contributor.authorWalton, Dominic J.
dc.contributor.authorConnors, Riley M. T.
dc.contributor.authorMadsen, Kristin
dc.contributor.authorHarrison, Fiona A.
dc.date.accessioned2023-02-20T16:30:02Z
dc.date.available2023-02-20T16:30:02Z
dc.date.issued2021-05-19
dc.identifier.citationXu , Y , García , J A , Walton , D J , Connors , R M T , Madsen , K & Harrison , F A 2021 , ' The Nature of Soft Excess in ESO 362-G18 Revealed by XMM-Newton and NuSTAR Spectroscopy ' , The Astrophysical Journal , vol. 944 , no. 2 . https://doi.org/10.3847/1538-4357/abf430
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 35335317
dc.identifier.otherPURE UUID: a95a1a32-be15-4cbc-86e7-83dcda2e30b6
dc.identifier.otherArXiv: http://arxiv.org/abs/2103.17002v1
dc.identifier.otherScopus: 85107027060
dc.identifier.otherORCID: /0000-0001-5819-3552/work/129622114
dc.identifier.urihttp://hdl.handle.net/2299/26066
dc.description© 2021. The American Astronomical Society. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.3847/1538-4357/abf430
dc.description.abstractWe present a detailed spectral analysis of the joint XMM-Newton and NuSTAR observations of the active galactic nuclei (AGN) in the Seyfert 1.5 Galaxy ESO 362-G18. The broadband ($0.3\mbox{--}79$ keV) spectrum shows the presence of a power-law continuum with a soft excess below $2$ keV, iron K$\alpha$ emission ($\sim 6.4$ keV), and a Compton hump (peaking at $\sim 20$ keV). We find that the soft excess can be modeled by two different possible scenarios: a warm ($kT_\mathrm{e}\sim0.2$ keV) and optically thick ($\tau\sim34$) Comptonizing corona; or with relativistically-blurred reflection off a high-density ($\log{[n_\mathrm{e}/\mathrm{cm}^{-3}]}>18.3$) inner disk. These two models cannot be easily distinguished solely from their fit statistics. However, the low temperature ($kT_\mathrm{e}\sim20$ keV) and the thick optical depth ($\tau\sim5$) of the hot corona required by the warm corona scenario are uncommon for AGNs. We also fit a 'hybrid' model, which includes both disk reflection and a warm corona. Unsurprisingly, as this is the most complex of the models considered, this provides the best fit, and more reasonable coronal parameters. In this case, the majority of the soft excess flux arises in the warm corona component. However, based on recent simulations of warm coronae, it is not clear whether such a structure can really exist at the low accretion rates relevant for ESO 362-G18 ($\dot{m}\sim0.015$). This may therefore argue in favor of a scenario in which the soft excess is instead dominated by the relativistic reflection. Based on this model, we find that the data would require a compact hot corona ($h\sim3\,R_\mathrm{Horizon}$) around a highly spinning ($a_\star>0.927$) black hole.en
dc.format.extent16
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectastro-ph.HE
dc.titleThe Nature of Soft Excess in ESO 362-G18 Revealed by XMM-Newton and NuSTAR Spectroscopyen
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.3847/1538-4357/abf430
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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