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dc.contributor.authorHardcastle, M.J.
dc.contributor.authorWorrall, D.M.
dc.contributor.authorKraft, R.P.
dc.contributor.authorForman, W.R.
dc.contributor.authorJones, C.
dc.contributor.authorMurray, S.S.
dc.date.accessioned2011-12-19T16:01:16Z
dc.date.available2011-12-19T16:01:16Z
dc.date.issued2003-08
dc.identifier.citationHardcastle , M J , Worrall , D M , Kraft , R P , Forman , W R , Jones , C & Murray , S S 2003 , ' Radio and X-Ray Observations of the Jet in Centaurus A ' , The Astrophysical Journal , vol. 593 , pp. 169-183 .
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 152208
dc.identifier.otherPURE UUID: 5bd9b3d2-37e3-43ba-b93e-a9baf813d840
dc.identifier.otherdspace: 2299/201
dc.identifier.otherScopus: 0141463919
dc.identifier.urihttp://hdl.handle.net/2299/7354
dc.description.abstractWe present new, high dynamic range VLA images of the inner jet of the closest radio galaxy, Centaurus A. Over a 10 yr baseline we detect apparent subluminal motions (v ~ 0:5c) in the jet on scales of hundreds of parsecs. The inferred speeds are larger than those previously determined using VLBI on smaller scales and provide new constraints on the angle made by the jet to the line of sight if we assume jet-counterjet symmetry. The new images also allow us to detect faint radio counterparts to a number of previously unidentified X-ray knots in the inner part of the jet and counterjet, showing conclusively that these X-ray features are genuinely associated with the outflow. However, we find that the knots with the highest X-ray/radio flux density ratios do not have detectable proper motions, suggesting that they may be related to standing shocks in the jet; we consider some possible internal obstacles that the jet may encounter.Using new, high-resolution Chandra data, we discuss the radio to X-ray spectra of the jet and the discrete features that it contains, and we argue that the compact radio and X-ray knots are privileged sites for the in situ particle acceleration that must be taking place throughout the jet. We show that the offsets observed between the peaks of the radio and X-ray emission at several places in the Cen A jet are not compatible with the simplest possible models involving particle acceleration and downstreamadvection together with synchrotron and expansion losses.en
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.rightsOpen
dc.subjectAstronomy
dc.titleRadio and X-Ray Observations of the Jet in Centaurus Aen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2003-08
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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