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dc.contributor.authorHardy, I.M.
dc.contributor.authorLawson, A.
dc.contributor.authorNewsam, A.
dc.contributor.authorMarscher, A.P.
dc.contributor.authorRobson, I.
dc.contributor.authorStevens, J. A.
dc.date.accessioned2008-01-30T10:34:46Z
dc.date.available2008-01-30T10:34:46Z
dc.date.issued1999
dc.identifier.citationHardy , I M , Lawson , A , Newsam , A , Marscher , A P , Robson , I & Stevens , J A 1999 , ' Simultaneous X-ray and IR variability in the quasar 3C 273 ' , Monthly Notices of the Royal Astronomical Society , vol. 310 , no. 2 , pp. 571-576 . https://doi.org/10.1046/j.1365-8711.1999.02959.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 160397
dc.identifier.otherPURE UUID: fb6b2411-69ae-46ab-ab9a-911e4ca39086
dc.identifier.otherdspace: 2299/1427
dc.identifier.otherScopus: 0041124390
dc.identifier.otherORCID: /0000-0002-4010-8310/work/62747686
dc.identifier.urihttp://hdl.handle.net/2299/1427
dc.descriptionThe definitive version is available at www.blackwell-synergy.com. Copyright Blackwell Publishing DOI : 10.1046/j.1365-8711.1999.02959.x
dc.description.abstractFrom a combination of high quality X-ray observations from the NASA Rossi X-ray Timing Explorer (RXTE), and infrared observations from the UK Infrared Telescope (UKIRT) we show that the medium energy X-ray (3-20 keV) and near infrared fluxes in the quasar 3C273 are highly correlated. It is widely believed that the X-ray emission in quasars like 3C273 arises from Compton scattering of low energy seed photons and our observations provide the first reliable detection of correlated variations in 3C273 between the X-ray band and any lower energy band. For a realistic electron distribution we demonstrate that it is probable that each decade of the seed photon distribution from the mm to IR waveband contributes roughly equally to the medium energy X-ray flux. However the expected mm variations are too small to be detected above the noise, probably explaining the lack of success of previous searches for a correlation between X-ray and mm variations. In addition we show that the infrared leads the X-rays by 0.75±0.25 days. These observations rule out the ‘External Compton’ emission process for the production of the X-rays.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleSimultaneous X-ray and IR variability in the quasar 3C 273en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1046/j.1365-8711.1999.02959.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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