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dc.contributor.authorWhite, Sarah V.
dc.contributor.authorJarvis, Matt J.
dc.contributor.authorKalfountzou, Eleni
dc.contributor.authorHardcastle, Martin
dc.contributor.authorVerma, Aprajita
dc.contributor.authorOrjales, José M. Cao
dc.contributor.authorStevens, Jason
dc.date.accessioned2018-08-16T00:11:26Z
dc.date.available2018-08-16T00:11:26Z
dc.date.issued2017-02-02
dc.identifier.citationWhite , S V , Jarvis , M J , Kalfountzou , E , Hardcastle , M , Verma , A , Orjales , J M C & Stevens , J 2017 , ' Evidence that the AGN dominates the radio emission in z ~ 1 radio-quiet quasars ' , Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/stx284
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 11174483
dc.identifier.otherPURE UUID: d236e1a0-a53f-4fb6-ab0f-b6a5d783f786
dc.identifier.otherArXiv: http://arxiv.org/abs/1702.00904v1
dc.identifier.otherScopus: 85017237098
dc.identifier.otherORCID: /0000-0002-4010-8310/work/62747658
dc.identifier.urihttp://hdl.handle.net/2299/20364
dc.descriptionThis document is the Accepted Manuscript version of the following article: Sarah V. White, Matt J. Jarvis, Eleni Kalfoutnzou, Martin J. Hardcastle, Aprajita Verma, Mose M. Cao Orjales, and Jason Stevens, 'Evidence that the AGN dominates the radio emission in z ~ 1 radio quiet quasars', Monthly Notices of the Royal Astronomical Society, first published online 3 February 2017, DOI: https://doi.org/10.1093/mnras/stx284 Key results are presented in Table 4 and Figure 7, which illustrates where the RQQs lie in relation to the far-infrared--radio correlation © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
dc.description.abstractIn order to understand the role of radio-quiet quasars (RQQs) in galaxy evolution, we must determine the relative levels of accretion and star-formation activity within these objects. Previous work at low radio flux-densities has shown that accretion makes a significant contribution to the total radio emission, in contrast with other quasar studies that suggest star formation dominates. To investigate, we use 70 RQQs from the Spitzer-Herschel Active Galaxy Survey. These quasars are all at $z$ ~ 1, thereby minimising evolutionary effects, and have been selected to span a factor of ~100 in optical luminosity, so that the luminosity dependence of their properties can be studied. We have imaged the sample using the Karl G. Jansky Very Large Array (JVLA), whose high sensitivity results in 35 RQQs being detected above 2 $\sigma$. This radio dataset is combined with far-infrared luminosities derived from grey-body fitting to Herschel photometry. By exploiting the far-infrared--radio correlation observed for star-forming galaxies, and comparing two independent estimates of the star-formation rate, we show that star formation alone is not sufficient to explain the total radio emission. Considering RQQs above a 2-$\sigma$ detection level in both the radio and the far-infrared, 92 per cent are accretion-dominated, and the accretion process accounts for 80 per cent of the radio luminosity when summed across the objects. The radio emission connected with accretion appears to be correlated with the optical luminosity of the RQQ, whilst a weaker luminosity-dependence is evident for the radio emission connected with star formation.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectgalaxies: active
dc.subjectgalaxies: star formation
dc.subjectgalaxies: evolution
dc.subjectgalaxies: high redshift
dc.subjectquasars: general
dc.subjectradio continuum: galaxies
dc.titleEvidence that the AGN dominates the radio emission in z ~ 1 radio-quiet quasarsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stx284
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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