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dc.contributor.authorFernandes, Cristina A. C.
dc.contributor.authorJarvis, M.J.
dc.contributor.authorMartínez-Sansigre, Alejo M. S.
dc.contributor.authorRawlings, Steve G.
dc.contributor.authorAfonso, José M.
dc.contributor.authorHardcastle, M.J.
dc.contributor.authorLacy, Mark
dc.contributor.authorStevens, Jason A.
dc.contributor.authorVardoulaki, Eleni
dc.date.accessioned2015-03-02T15:33:28Z
dc.date.available2015-03-02T15:33:28Z
dc.date.issued2015-02-21
dc.identifier.citationFernandes , C A C , Jarvis , M J , Martínez-Sansigre , A M S , Rawlings , S G , Afonso , J M , Hardcastle , M J , Lacy , M , Stevens , J A & Vardoulaki , E 2015 , ' Black hole masses, accretion rates and hot- and cold-mode accretion in radio galaxies at z ~ 1 ' , Monthly Notices of the Royal Astronomical Society , vol. 447 , no. 2 , pp. 1184-1203 . https://doi.org/10.1093/mnras/stu2517
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 8177688
dc.identifier.otherPURE UUID: d8a8b63e-e62e-4e3e-b563-5a8a5188b2ec
dc.identifier.otherScopus: 84922496633
dc.identifier.urihttp://hdl.handle.net/2299/15498
dc.descriptionDate of Acceptance: 25/11/2014
dc.description.abstractUnderstanding the evolution of accretion activity is fundamental to our understanding of how galaxies form and evolve over the history of the Universe. We analyse a complete sample of 27 radio galaxies which includes both high-excitation galaxies (HEGs) and low-excitation galaxies (LEGs), spanning a narrow redshift range of 0.9 < z < 1.1 and covering a factor of ~1000 in radio luminosity. Using data from the Spitzer Space Telescope combined with ground-based optical and near-infrared imaging, we show that the host galaxies have masses in the range of 10.7<log10(M/M⊙)<12.0with HEGs and LEGs exhibiting no difference in their mass distributions. We also find that HEGs accrete at significantly higher rates than LEGs, with the HEG/LEG division lying at an Eddington ratio of λ~0.04, which is in excellent agreement with theoretical predictions of where the accretion rate becomes radiatively inefficient, thus supporting the idea of HEGs and LEGs being powered by different modes of accretion. Our study also shows that at least up to L151MHz ~ 3 × 1027WHz-1 sr-1, HEGs and LEGs are indistinguishable in terms of their radio properties. From this result we infer that, at least for the lower radio luminosity range, another factor besides accretion rate must play an important role in the process of triggering jet activity.en
dc.format.extent20
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rights/dk/atira/pure/core/openaccesspermission/open
dc.subjectActive - galaxies
dc.subjectGalaxies
dc.subjectGalaxies - radio continuum
dc.subjectGeneral - infrared
dc.subjectJets - galaxies
dc.subjectNuclei - quasars
dc.titleBlack hole masses, accretion rates and hot- and cold-mode accretion in radio galaxies at z ~ 1en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stu2517
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeopenAccess


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