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dc.contributor.authorCroston, J. H.
dc.contributor.authorIneson, J.
dc.contributor.authorHardcastle, M. J.
dc.date.accessioned2018-06-06T17:08:51Z
dc.date.available2018-06-06T17:08:51Z
dc.date.issued2018-05-11
dc.identifier.citationCroston , J H , Ineson , J & Hardcastle , M J 2018 , ' Particle content, radio-galaxy morphology and jet power : all radio-loud AGN are not equal ' , Monthly Notices of the Royal Astronomical Society , vol. 476 , no. 2 , sty274 , pp. 1614-1623 . https://doi.org/10.1093/mnras/sty274
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 13377941
dc.identifier.otherPURE UUID: a08150fa-6a00-452b-8cec-99a85975c081
dc.identifier.otherArXiv: http://arxiv.org/abs/1801.10172v1
dc.identifier.otherScopus: 85050653063
dc.identifier.urihttp://hdl.handle.net/2299/20145
dc.descriptionThis article has been accepted for publication 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.
dc.description.abstractOngoing and future radio surveys aim to trace the evolution of black hole growth and feedback from active galactic nuclei (AGNs) throughout cosmic time; however, there remain major uncertainties in translating radio luminosity functions into a reliable assessment of the energy input as a function of galaxy and/or dark matter halo mass. A crucial and long-standing problem is the composition of the radio-lobe plasma that traces AGN jet activity. In this paper, we carry out a systematic comparison of the plasma conditions in Fanaroff & Riley class I and II radio galaxies to demonstrate conclusively that their internal composition is systematically different. This difference is best explained by the presence of an energetically dominant proton population in the FRI, but not the FRII radio galaxies. We show that, as expected from this systematic difference in particle content, radio morphology also affects the jet-power/radio-luminosity relationship, with FRII radio galaxies having a significantly lower ratio of jet power to radio luminosity than the FRI cluster radio sources used to derive jet-power scaling relations via X-ray cavity measurements. Finally, we also demonstrate conclusively that lobe composition is unconnected to accretion mode (optical excitation class): the internal conditions of low- and high-excitation FRII radio lobes are indistinguishable. We conclude that inferences of population-wide AGN impact require careful assessment of the contribution of different jet subclasses, particularly given the increased diversity of jet evolutionary states expected to be present in deep, low-frequency radio surveys such as the LOFAR Two-Metre Sky Survey.en
dc.format.extent10
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectGalaxies: active
dc.subjectX-rays: galaxies: clusters
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleParticle content, radio-galaxy morphology and jet power : all radio-loud AGN are not equalen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85050653063&partnerID=8YFLogxK
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2018-05-11
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/sty274
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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