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dc.contributor.authorMahatma, V. H.
dc.contributor.authorHardcastle, M. J.
dc.contributor.authorWilliams, W. L.
dc.contributor.authorBrienza, M.
dc.contributor.authorBruggen, M.
dc.contributor.authorCroston, J. H.
dc.contributor.authorGurkan, G.
dc.contributor.authorHarwood, J. J.
dc.contributor.authorKunert-Bajraszewska, M.
dc.contributor.authorMorganti, R.
dc.contributor.authorRottgering, H. J. A.
dc.contributor.authorShimwell, T. W.
dc.contributor.authorTasse, C.
dc.date.accessioned2018-06-06T17:08:13Z
dc.date.available2018-06-06T17:08:13Z
dc.date.issued2018-04-21
dc.identifier.citationMahatma , V H , Hardcastle , M J , Williams , W L , Brienza , M , Bruggen , M , Croston , J H , Gurkan , G , Harwood , J J , Kunert-Bajraszewska , M , Morganti , R , Rottgering , H J A , Shimwell , T W & Tasse , C 2018 , ' Remnant radio-loud AGN in the Herschel-ATLAS field ' , Monthly Notices of the Royal Astronomical Society , vol. 475 , no. 4 , sty025 , pp. 4557–4578 . https://doi.org/10.1093/mnras/sty025
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 13121050
dc.identifier.otherPURE UUID: 909f3491-feaf-44a4-92bb-8bd632237c58
dc.identifier.otherArXiv: http://arxiv.org/abs/1801.01067v1
dc.identifier.otherScopus: 85042531042
dc.identifier.otherORCID: /0000-0003-0251-6126/work/62748354
dc.identifier.otherORCID: /0000-0001-7315-1596/work/62750975
dc.identifier.urihttp://hdl.handle.net/2299/20141
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.
dc.description.abstractOnly a small fraction of observed active galactic nuclei (AGN) display large-scale radio emission associated with jets, yet these radio-loud AGN have become increasingly important in models of galaxy evolution. In determining the dynamics and energetics of the radio sources over cosmic time, a key question concerns what happens when their jets switch off. The resulting 'remnant' radio-loud AGN have been surprisingly evasive in past radio surveys, and therefore statistical information on the population of radio-loud AGN in their dying phase is limited. In this paper, with the recent developments of Low-Frequency Array (LOFAR) and theVery Large Array, we are able to provide a systematically selected sample of remnant radioloud AGN in the Herschel-ATLAS field. Using a simple core-detection method, we constrain the upper limit on the fraction of remnants in our radio-loud AGN sample to 9 per cent, implying that the extended lobe emission fades rapidly once the core/jets turn off. We also find that our remnant sample has a wide range of spectral indices (-1.5 ≤ α 1400 150 ≤ -0.5), confirming that the lobes of some remnants may possess flat spectra at low frequencies just as active sources do. We suggest that, even with the unprecedented sensitivity of LOFAR, our sample may still only contain the youngest of the remnant population.en
dc.format.extent22
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectGalaxies: Active
dc.subjectgalaxies: jets
dc.subjectMethods: statistical
dc.subjectRadio continuum: galaxies
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleRemnant radio-loud AGN in the Herschel-ATLAS fielden
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=85042531042&partnerID=8YFLogxK
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/sty025
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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