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dc.contributor.authorDonnan, Fergus R
dc.contributor.authorHernandez Santisteban, Juan V.
dc.contributor.authorHorne, Keith
dc.contributor.authorHu, Chen
dc.contributor.authorDu, Pu
dc.contributor.authorLi, Yan-Rong
dc.contributor.authorXiao, Ming
dc.contributor.authorHo, Luis C
dc.contributor.authorAceituno, Jesús
dc.contributor.authorWang, Jian-Min
dc.contributor.authorGuo, Wei-Jian
dc.contributor.authorYang, Sen
dc.contributor.authorJiang, Bo-Wei
dc.contributor.authorYao, Zhu-Heng
dc.identifier.citationDonnan , F R , Hernandez Santisteban , J V , Horne , K , Hu , C , Du , P , Li , Y-R , Xiao , M , Ho , L C , Aceituno , J , Wang , J-M , Guo , W-J , Yang , S , Jiang , B-W & Yao , Z-H 2023 , ' Testing super-eddington accretion on to a supermassive black hole : reverberation mapping of PG 1119+120 ' , Monthly Notices of the Royal Astronomical Society , vol. 523 , no. 1 , pp. 545-567 .
dc.identifier.otherPURE: 286646847
dc.identifier.otherPURE UUID: ab39a19b-17d6-4368-a164-19763f1f0ed3
dc.identifier.otherBibtex: 10.1093/mnras/stad1409
dc.identifier.otherORCID: /0000-0002-6733-5556/work/136289070
dc.identifier.otherScopus: 85163064300
dc.descriptionFunding: KH and JVHS acknowledge support from STFC grant ST/R000824/1. CH acknowledges support from the National Science Foundation of China (12122305). PD acknowledges support from NSFC grant 12022301, 11991051, and 11991054, and from National Key R&D Program of China (grant 2021YFA1600404). LCH was supported by the National Science Foundation of China (grants 11721303, 11991052,12011540375, and 12233001) and the China Manned Space Project (CMS-CSST-2021-A04, CMS-CSST-2021-A06).en
dc.description.abstractWe measure the black hole mass and investigate the accretion flow around the local (z = 0.0502) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides H β lags and linewidths from which we estimate a black hole mass of log (M•/M⊙) = 7.0, uncertain by ∼0.4 dex. High cadence photometric monitoring over 2 yr with the Las Cumbres Observatory provides light curves in seven optical bands suitable for intensive continuum reverberation mapping. We identify variability on two time-scales. Slower variations on a 100-d time-scale exhibit excess flux and increased lag in the u′ band and are thus attributable to diffuse bound-free continuum emission from the broad-line region. Faster variations that we attribute to accretion disc reprocessing lack a u′-band excess and have flux and delay spectra consistent with either τ ∝ λ4/3, as expected for a temperature structure of T(R) ∝ R−3/4 for a thin accretion disc, or τ ∝ λ2 expected for a slim disc. Decomposing the flux into variable (disc) and constant (host galaxy) components, we find the disc SED to be flatter than expected with ƒv ∼ const. Modelling the SED predicts an Eddington ratio of λEdd > 1, where the flat spectrum can be reproduced by a slim disc with little dust extinction or a thin disc that requires more dust extinction. While this accretion is super-Eddington, the geometry is still unclear; however, a slim disc is expected due to the high radiation pressure at these accretion rates, and is entirely consistent with our observations.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.rightsCopyright © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at
dc.subjectAccretion discsen
dc.subjectGalaxies: inactiveen
dc.subjectGalaxies: individual: PG1119+120en
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleTesting super-eddington accretion on to a supermassive black hole : reverberation mapping of PG 1119+120en
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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