dc.contributor.author White, Sarah V. dc.contributor.author Jarvis, Matt J. dc.contributor.author Kalfountzou, Eleni dc.contributor.author Hardcastle, Martin dc.contributor.author Verma, Aprajita dc.contributor.author Orjales, José M. Cao dc.contributor.author Stevens, Jason dc.date.accessioned 2018-08-16T00:11:26Z dc.date.available 2018-08-16T00:11:26Z dc.date.issued 2017-02-02 dc.identifier.citation White , 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.issn 0035-8711 dc.identifier.other PURE: 11174483 dc.identifier.other PURE UUID: d236e1a0-a53f-4fb6-ab0f-b6a5d783f786 dc.identifier.other ArXiv: http://arxiv.org/abs/1702.00904v1 dc.identifier.other Scopus: 85017237098 dc.identifier.other ORCID: /0000-0002-4010-8310/work/62747658 dc.identifier.uri http://hdl.handle.net/2299/20364 dc.description This 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.abstract In 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.iso eng dc.relation.ispartof Monthly Notices of the Royal Astronomical Society dc.subject galaxies: active dc.subject galaxies: star formation dc.subject galaxies: evolution dc.subject galaxies: high redshift dc.subject quasars: general dc.subject radio continuum: galaxies dc.title Evidence that the AGN dominates the radio emission in z ~ 1 radio-quiet quasars en dc.contributor.institution School of Physics, Astronomy and Mathematics dc.contributor.institution Centre for Astrophysics Research dc.description.status Peer reviewed rioxxterms.version AM rioxxterms.versionofrecord https://doi.org/10.1093/mnras/stx284 rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true
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