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dc.contributor.authorVries, M. N. de
dc.contributor.authorWise, M. W.
dc.contributor.authorHuppenkothen, D.
dc.contributor.authorNulsen, P. E. J.
dc.contributor.authorSnios, B.
dc.contributor.authorHardcastle, M. J.
dc.contributor.authorBirkinshaw, M.
dc.contributor.authorWorrall, D. M.
dc.contributor.authorDuffy, R. T.
dc.contributor.authorMcNamara, B. R.
dc.date.accessioned2018-08-16T00:17:06Z
dc.date.available2018-08-16T00:17:06Z
dc.date.issued2018-08-21
dc.identifier.citationVries , M N D , Wise , M W , Huppenkothen , D , Nulsen , P E J , Snios , B , Hardcastle , M J , Birkinshaw , M , Worrall , D M , Duffy , R T & McNamara , B R 2018 , ' Detection of non-thermal X-ray emission in the lobes and jets of Cygnus A ' , Monthly Notices of the Royal Astronomical Society , vol. 478 , no. 3 , pp. 4010–4029 . https://doi.org/10.1093/mnras/sty1232
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 13825429
dc.identifier.otherPURE UUID: eaa9c35e-8805-4b77-a263-d86f4002b339
dc.identifier.otherArXiv: http://arxiv.org/abs/1805.03114v1
dc.identifier.otherScopus: 85060535462
dc.identifier.urihttp://hdl.handle.net/2299/20442
dc.descriptionThis article has been published in Monthly Notices of the Royal Astronomical Society © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. 21 pages, 8 figures
dc.description.abstractWe present a spectral analysis of the lobes and X-ray jets of Cygnus A, using more than 2 Ms of $\textit{Chandra}$ observations. The X-ray jets are misaligned with the radio jets and significantly wider. We detect non-thermal emission components in both lobes and jets. For the eastern lobe and jet, we find 1 keV flux densities of $71_{-10}^{+10}$ nJy and $24_{-4}^{+4}$ nJy, and photon indices of $1.72_{-0.03}^{+0.03}$ and $1.64_{-0.04}^{+0.04}$ respectively. For the western lobe and jet, we find flux densities of $50_{-13}^{+12}$ nJy and $13_{-5}^{+5}$ nJy, and photon indices of $1.97_{-0.10}^{+0.23}$ and $1.86_{-0.12}^{+0.18}$ respectively. Using these results, we modeled the electron energy distributions of the lobes as broken power laws with age breaks. We find that a significant population of non-radiating particles is required to account for the total pressure of the eastern lobe. In the western lobe, no such population is required and the low energy cutoff to the electron distribution there needs to be raised to obtain pressures consistent with observations. This discrepancy is a consequence of the differing X-ray photon indices, which may indicate that the turnover in the inverse-Compton spectrum of the western lobe is at lower energies than in the eastern lobe. We modeled the emission from both jets as inverse-Compton emission. There is a narrow region of parameter space for which the X-ray jet can be a relic of an earlier active phase, although lack of knowledge about the jet's electron distribution and particle content makes the modelling uncertain.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectastro-ph.HE
dc.titleDetection of non-thermal X-ray emission in the lobes and jets of Cygnus Aen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2018-08-21
rioxxterms.versionAM
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/sty1232
rioxxterms.licenseref.uriOther
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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