dc.contributor.author | Hardy, I.M. | |
dc.contributor.author | Lawson, A. | |
dc.contributor.author | Newsam, A. | |
dc.contributor.author | Marscher, A.P. | |
dc.contributor.author | Robson, I. | |
dc.contributor.author | Stevens, J. A. | |
dc.date.accessioned | 2008-01-30T10:34:46Z | |
dc.date.available | 2008-01-30T10:34:46Z | |
dc.date.issued | 1999 | |
dc.identifier.citation | Hardy , 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.issn | 0035-8711 | |
dc.identifier.other | dspace: 2299/1427 | |
dc.identifier.other | ORCID: /0000-0002-4010-8310/work/62747686 | |
dc.identifier.uri | http://hdl.handle.net/2299/1427 | |
dc.description | The definitive version is available at www.blackwell-synergy.com. Copyright Blackwell Publishing DOI : 10.1046/j.1365-8711.1999.02959.x | |
dc.description.abstract | From 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.format.extent | 202599 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.title | Simultaneous X-ray and IR variability in the quasar 3C 273 | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1046/j.1365-8711.1999.02959.x | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |