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dc.contributor.authorMullin, L.M.
dc.contributor.authorHardcastle, M.J.
dc.date.accessioned2010-02-26T14:15:16Z
dc.date.available2010-02-26T14:15:16Z
dc.date.issued2009
dc.identifier.citationMullin , L M & Hardcastle , M J 2009 , ' Bayesian inference of jet bulk-flow speeds in Fanaroff–Riley type II radio sources ' , Monthly Notices of the Royal Astronomical Society , vol. 398 , no. 4 , pp. 1989-2004 . https://doi.org/10.1111/j.1365-2966.2009.15232.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 156232
dc.identifier.otherPURE UUID: a0658d42-bbe9-442b-b843-34d3d3799005
dc.identifier.otherdspace: 2299/4320
dc.identifier.otherScopus: 70349218426
dc.identifier.urihttp://hdl.handle.net/2299/4320
dc.description‘The definitive version is available at www3.interscience.wiley.com '. Copyright Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2009.15232.x
dc.description.abstractRadio jet and core data for a complete sample of 98 Fanaroff–Riley type II sources with z < 1 are analysed with a Markov Chain Monte Carlo model fitting method to obtain constraints on bulk-flow speeds in the beam. The Bayesian parameter-inference method is described and demonstrated to be capable of providing meaningful constraints on the Lorentz factor at both kpc and parsec scales. For both jets and cores, we show that models in which some intrinsic dispersion is present in the features' intrinsic prominence, bulk-flow speeds or both provide the best fit to the data. The constraints on the Lorentz factor on parsec scales are found to be consistent with the expected values given very long baseline interferometry observations and other evidence, with . On kpc scales, the Lorentz factor is found to be ≈1.18–1.49, in agreement with the results of previous analyses of radio jet data. These values are clearly not consistent with the γ≈ 10 speeds required by beamed inverse-Compton models of X-ray emission from quasar jets; our results therefore support models that require velocity structure in powerful jets.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.titleBayesian inference of jet bulk-flow speeds in Fanaroff–Riley type II radio sourcesen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=70349218426&partnerID=8YFLogxK
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2009
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2009.15232.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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