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dc.contributor.authorGarcia, JAen
dc.contributor.authorFabian, Andrewen
dc.contributor.authorKallman, TRen
dc.contributor.authorDauser, Ten
dc.contributor.authorParker, Michaelen
dc.contributor.authorMcClintock, JEen
dc.contributor.authorSteiner, JFen
dc.contributor.authorWilms, Jen
dc.date.accessioned2017-02-27T11:52:53Z
dc.date.available2017-02-27T11:52:53Z
dc.date.issued2016-10-11en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/262783
dc.description.abstractCurrent models of the spectrum of X-rays reflected from accretion discs around black holes and other compact objects are commonly calculated assuming that the density of the disc atmosphere is constant within several Thomson depths from the irradiated surface. An important simplifying assumption of these models is that the ionization structure of the gas is completely specified by a single, fixed value of the ionization parameter $\xi$, which is the ratio of the incident flux to the gas density. The density is typically fixed at $n_\text{e}$ = 10$^{15}$ cm$^{−3}$. Motivated by observations, we consider higher densities in the calculation of the reflected spectrum. We show by computing model spectra for $n_\text{e}$ $\gtrsim$ 10$^{17}$ cm$^{−3}$ that high-density effects significantly modify reflection spectra. The main effect is to boost the thermal continuum at energies $\lesssim$2 keV. We discuss the implications of these results for interpreting observations of both active galactic nuclei and black hole binaries. We also discuss the limitations of our models imposed by the quality of the atomic data currently available.
dc.description.sponsorshipJG and JEM acknowledge the support of a CGPS grant from the Smithsonian Institution. ACF acknowledges ERC Advanced Grant 340442 Feedback. JFS has been supported by the Einstein Fellowship grant PF5-160144.
dc.language.isoenen
dc.publisherOxford University Press
dc.subjectaccretion, accretion discsen
dc.subjectatomic processesen
dc.subjectline: formationen
dc.subjectradiative transferen
dc.subjectrelativistic processesen
dc.subjectX-rays: generalen
dc.titleThe effects of high density on the X-ray spectrum reflected from accretion discs around black holesen
dc.typeArticle
prism.endingPage760
prism.issueIdentifier1en
prism.publicationDate2016en
prism.publicationNameMonthly Notices of the Royal Astronomical Societyen
prism.startingPage751
prism.volume462en
dc.identifier.doi10.17863/CAM.8073
dcterms.dateAccepted2016-07-12en
rioxxterms.versionofrecord10.1093/mnras/stw1696en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2016-10-11en
dc.contributor.orcidFabian, Andrew [0000-0002-9378-4072]
dc.contributor.orcidParker, Michael [0000-0002-8466-7317]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2016-07-14en
cam.orpheus.successThu Jan 30 12:56:34 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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