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dc.contributor.authorSisk-Reynes, J
dc.contributor.authorReynolds, Christopher
dc.contributor.authorMatthews, James
dc.contributor.authorSmith, RN
dc.date.accessioned2022-05-17T23:30:23Z
dc.date.available2022-05-17T23:30:23Z
dc.date.issued2022-06-21
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/337257
dc.description.abstract<jats:title>ABSTRACT</jats:title> <jats:p>We present an analysis of deep Chandra Low-Energy and High-Energy Transmission Grating archival observations of the extraordinarily luminous radio-quiet quasar H1821+643, hosted by a rich and massive cool-core cluster at redshift z = 0.3. These data sets provide high-resolution spectra of the AGN at two epochs, free from contamination by the intracluster medium and from the effects of photon pile-up, providing a sensitive probe of the iron-K band. At both epochs, the spectrum is well described by a power-law continuum plus X-ray reflection from both the inner accretion disc and cold, slowly moving distant matter. Adopting this framework, we proceed to examine the properties of the inner disc and the black hole spin. Using Markov chain Monte Carlo (MCMC) methods, we combine constraints from the two epochs assuming that the black hole spin, inner disc inclination, and inner disc iron abundance are invariant. The black hole spin is found to be modest, with a 90 per cent credible range of ${a}^{*}=0.62^{+0.22}_{-0.37}$; and, with a mass MBH in the range log (MBH/M⊙) ∼ 9.2–10.5, this is the most massive black hole candidate for which a well-defined spin constraint has yet been obtained. The modest spin of this black hole supports previous suggestions that the most massive black holes may grow via incoherent or chaotic accretion and/or SMBH-SMBH mergers.</jats:p>
dc.description.sponsorshipERC Advanced Award (DISKtoHALO)
dc.publisherOxford University Press (OUP)
dc.rightsAll Rights Reserved
dc.rights.urihttp://www.rioxx.net/licenses/all-rights-reserved
dc.titleEvidence for a moderate spin from X-ray reflection of the high-mass supermassive black hole in the cluster-hosted quasar H1821+643
dc.typeArticle
dc.publisher.departmentInstitute of Astronomy
dc.date.updated2022-05-17T07:23:45Z
prism.publicationNameMonthly Notices of the Royal Astronomical Society
dc.identifier.doi10.17863/CAM.84673
dcterms.dateAccepted2022-05-12
rioxxterms.versionofrecord10.1093/mnras/stac1389
rioxxterms.versionAM
dc.contributor.orcidSisk-Reynes, J [0000-0003-3814-6796]
dc.contributor.orcidReynolds, Christopher [0000-0002-1510-4860]
dc.contributor.orcidMatthews, James [0000-0002-3493-7737]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Review
pubs.funder-project-idScience and Technology Facilities Council (ST/S000623/1)
pubs.funder-project-idEuropean Commission Horizon 2020 (H2020) ERC (834203)
pubs.funder-project-idSTFC (ST/V50659X/1)
cam.issuedOnline2022-06-21
cam.orpheus.successMon Jun 27 07:18:59 BST 2022 - Embargo updated
cam.orpheus.counter4
cam.depositDate2022-05-17
pubs.licence-identifierapollo-deposit-licence-2-1
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
rioxxterms.freetoread.startdate2022-06-21


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