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dc.contributor.authorHarwood, J.J.
dc.contributor.authorHardcastle, M.J.
dc.contributor.authorCroston, J.H.
dc.contributor.authorGoodger, J.L.
dc.date.accessioned2014-01-13T09:30:41Z
dc.date.available2014-01-13T09:30:41Z
dc.date.issued2013-11-01
dc.identifier.citationHarwood , J J , Hardcastle , M J , Croston , J H & Goodger , J L 2013 , ' Spectral ageing in the lobes of FR-II radio galaxies : New methods of analysis for broad-band radio data ' , Monthly Notices of the Royal Astronomical Society , vol. 435 , no. 4 , pp. 3353-3375 . https://doi.org/10.1093/mnras/stt1526
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 2675645
dc.identifier.otherPURE UUID: 72cb60b1-0fd8-4e80-94eb-8cac1065a684
dc.identifier.otherScopus: 84885702862
dc.identifier.otherORCID: /0000-0003-0251-6126/work/62748346
dc.identifier.urihttp://hdl.handle.net/2299/12515
dc.description.abstractThe broad-bandwidth capabilities of next generation telescopes such as the Jansky Very Large Array (JVLA) mean that the spectrum of any given source varies significantly within the bandwidth of any given observation. Detailed spectral analysis taking this variation into account is set to become standard practice when dealing with any new broad-band radio observations; it is therefore vital that methods are developed to handle this new type of data. In this paper, we present the Broadband Radio Astronomy ToolS (BRATS) software package and, use it to carry out detailed analysis of JVLA observations of three powerful radio galaxies. We compare two of the most widely used models of spectral ageing, the Kardashev-Pacholczyk and Jaffe-Perola models and also results of the more complex, but potentially more realistic, Tribble model. We find that the Tribble model provides both a good fit to observations as well as providing a physically realistic description of the source. We present the first high-resolution spectral maps of our sources and find that the best-fitting injection indices across all models take higher values than have previously been assumed. We present characteristic hotspot advance speeds and make comparison to those derived from dynamical ages, confirming the previously known discrepancy in speed remains present when determined at high spectral resolutions. We show that some previously common assumptions made in determining spectral ages with narrow-band radio telescopes may not always hold and strongly suggest that these are accounted for in future investigations.en
dc.format.extent23
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleSpectral ageing in the lobes of FR-II radio galaxies : New methods of analysis for broad-band radio dataen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionLibrary and Computing Services
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stt1526
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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