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dc.contributor.authorGiroletti, M.
dc.contributor.authorMassaro, F.
dc.contributor.authorD'Abrusco, R.
dc.contributor.authorLico, R.
dc.contributor.authorBurlon, D.
dc.contributor.authorHurley-Walker, N.
dc.contributor.authorJohnston-Hollitt, M.
dc.contributor.authorMorgan, J.
dc.contributor.authorPavlidou, V.
dc.contributor.authorBell, M.
dc.contributor.authorBernardi, G.
dc.contributor.authorBhat, R.
dc.contributor.authorBowman, J. D.
dc.contributor.authorBriggs, F.
dc.contributor.authorCappallo, R. J.
dc.contributor.authorCorey, B. E.
dc.contributor.authorDeshpande, A. A.
dc.contributor.authorEwall-Rice, A.
dc.contributor.authorEmrich, D.
dc.contributor.authorGaensler, B. M.
dc.contributor.authorGoeke, R.
dc.contributor.authorGreenhill, L. J.
dc.contributor.authorHazelton, B. J.
dc.contributor.authorHindson, L.
dc.contributor.authorKaplan, D. L.
dc.contributor.authorKasper, J. C.
dc.contributor.authorKratzenberg, E.
dc.contributor.authorFeng, L.
dc.contributor.authorJacobs, D.
dc.contributor.authorKurdryavtseva, N.
dc.contributor.authorLenc, E.
dc.contributor.authorLonsdale, C. J.
dc.contributor.authorLynch, M. J.
dc.contributor.authorMcKinley, B.
dc.contributor.authorMcWhirter, S. R.
dc.contributor.authorMitchell, D. A.
dc.contributor.authorMorales, M. F.
dc.contributor.authorMorgan, E.
dc.contributor.authorOberoi, D.
dc.contributor.authorOffringa, A. R.
dc.contributor.authorOrd, S. M.
dc.contributor.authorPindor, B.
dc.contributor.authorPrabu, T.
dc.contributor.authorProcopio, P.
dc.contributor.authorRiding, J.
dc.contributor.authorRogers, A. E. E.
dc.contributor.authorRoshi, A.
dc.contributor.authorShankar, N. Udaya
dc.contributor.authorSrivani, K. S.
dc.contributor.authorSubrahmanyan, R.
dc.contributor.authorTingay, S. J.
dc.contributor.authorWaterson, M.
dc.contributor.authorWayth, R. B.
dc.contributor.authorWebster, R. L.
dc.contributor.authorWhitney, A. R.
dc.contributor.authorWilliams, A.
dc.contributor.authorWilliams, C. L.
dc.date.accessioned2018-08-16T00:09:08Z
dc.date.available2018-08-16T00:09:08Z
dc.date.issued2016-04-01
dc.identifier.citationGiroletti , M , Massaro , F , D'Abrusco , R , Lico , R , Burlon , D , Hurley-Walker , N , Johnston-Hollitt , M , Morgan , J , Pavlidou , V , Bell , M , Bernardi , G , Bhat , R , Bowman , J D , Briggs , F , Cappallo , R J , Corey , B E , Deshpande , A A , Ewall-Rice , A , Emrich , D , Gaensler , B M , Goeke , R , Greenhill , L J , Hazelton , B J , Hindson , L , Kaplan , D L , Kasper , J C , Kratzenberg , E , Feng , L , Jacobs , D , Kurdryavtseva , N , Lenc , E , Lonsdale , C J , Lynch , M J , McKinley , B , McWhirter , S R , Mitchell , D A , Morales , M F , Morgan , E , Oberoi , D , Offringa , A R , Ord , S M , Pindor , B , Prabu , T , Procopio , P , Riding , J , Rogers , A E E , Roshi , A , Shankar , N U , Srivani , K S , Subrahmanyan , R , Tingay , S J , Waterson , M , Wayth , R B , Webster , R L , Whitney , A R , Williams , A & Williams , C L 2016 , ' High-energy sources at low radio frequency : the Murchison Widefield Array view of Fermi blazars ' , Astronomy & Astrophysics , vol. 588 , A141 . https://doi.org/10.1051/0004-6361/201527817
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 10290895
dc.identifier.otherPURE UUID: b30e17b2-4bf9-4a6a-a47a-e706ede656ae
dc.identifier.otherArXiv: http://arxiv.org/abs/1602.08869v1
dc.identifier.otherScopus: 84964336826
dc.identifier.urihttp://hdl.handle.net/2299/20344
dc.descriptionThis is the accepted version of the following article: Giroletti, M. et al., A&A, 588 (2016) A141, which has been published in final form at DOI: http://dx.doi.org/10.1051/0004-6361/201527817. This article may be used for non-commercial purposes in accordance with the EDP Sciences self-archiving policies.
dc.description.abstractLow-frequency radio arrays are opening a new window for the study of the sky, both to study new phenomena and to better characterize known source classes. Being flat-spectrum sources, blazars are so far poorly studied at low radio frequencies. We characterize the spectral properties of the blazar population at low radio frequency compare the radio and high-energy properties of the gamma-ray blazar population, and search for radio counterparts of unidentified gamma-ray sources. We cross-correlated the 6,100 deg^2 Murchison Widefield Array Commissioning Survey catalogue with the Roma blazar catalogue, the third catalogue of active galactic nuclei detected by Fermi-LAT, and the unidentified members of the entire third catalogue of gamma-ray sources detected by \fermilat. When available, we also added high-frequency radio data from the Australia Telescope 20 GHz catalogue. We find low-frequency counterparts for 186 out of 517 (36%) blazars, 79 out of 174 (45%) gamma-ray blazars, and 8 out of 73 (11%) gamma-ray blazar candidates. The mean low-frequency (120--180 MHz) blazar spectral index is $\langle \alpha_\mathrm{low} \rangle=0.57\pm0.02$: blazar spectra are flatter than the rest of the population of low-frequency sources, but are steeper than at $\sim$GHz frequencies. Low-frequency radio flux density and gamma-ray energy flux display a mildly significant and broadly scattered correlation. Ten unidentified gamma-ray sources have a (probably fortuitous) positional match with low radio frequency sources. Low-frequency radio astronomy provides important information about sources with a flat radio spectrum and high energy. However, the relatively low sensitivity of the present surveys still misses a significant fraction of these objects. Upcoming deeper surveys, such as the GaLactic and Extragalactic All-Sky MWA (GLEAM) survey, will provide further insight into this population.en
dc.format.extent9
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.rightsOpen
dc.subjectastro-ph.HE
dc.titleHigh-energy sources at low radio frequency : the Murchison Widefield Array view of Fermi blazarsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2016-04-01
rioxxterms.versionAM
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/201527817
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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