High-energy sources at low radio frequency : the Murchison Widefield Array view of Fermi blazars
dc.contributor.author | Giroletti, M. | |
dc.contributor.author | Massaro, F. | |
dc.contributor.author | D'Abrusco, R. | |
dc.contributor.author | Lico, R. | |
dc.contributor.author | Burlon, D. | |
dc.contributor.author | Hurley-Walker, N. | |
dc.contributor.author | Johnston-Hollitt, M. | |
dc.contributor.author | Morgan, J. | |
dc.contributor.author | Pavlidou, V. | |
dc.contributor.author | Bell, M. | |
dc.contributor.author | Bernardi, G. | |
dc.contributor.author | Bhat, R. | |
dc.contributor.author | Bowman, J. D. | |
dc.contributor.author | Briggs, F. | |
dc.contributor.author | Cappallo, R. J. | |
dc.contributor.author | Corey, B. E. | |
dc.contributor.author | Deshpande, A. A. | |
dc.contributor.author | Ewall-Rice, A. | |
dc.contributor.author | Emrich, D. | |
dc.contributor.author | Gaensler, B. M. | |
dc.contributor.author | Goeke, R. | |
dc.contributor.author | Greenhill, L. J. | |
dc.contributor.author | Hazelton, B. J. | |
dc.contributor.author | Hindson, L. | |
dc.contributor.author | Kaplan, D. L. | |
dc.contributor.author | Kasper, J. C. | |
dc.contributor.author | Kratzenberg, E. | |
dc.contributor.author | Feng, L. | |
dc.contributor.author | Jacobs, D. | |
dc.contributor.author | Kurdryavtseva, N. | |
dc.contributor.author | Lenc, E. | |
dc.contributor.author | Lonsdale, C. J. | |
dc.contributor.author | Lynch, M. J. | |
dc.contributor.author | McKinley, B. | |
dc.contributor.author | McWhirter, S. R. | |
dc.contributor.author | Mitchell, D. A. | |
dc.contributor.author | Morales, M. F. | |
dc.contributor.author | Morgan, E. | |
dc.contributor.author | Oberoi, D. | |
dc.contributor.author | Offringa, A. R. | |
dc.contributor.author | Ord, S. M. | |
dc.contributor.author | Pindor, B. | |
dc.contributor.author | Prabu, T. | |
dc.contributor.author | Procopio, P. | |
dc.contributor.author | Riding, J. | |
dc.contributor.author | Rogers, A. E. E. | |
dc.contributor.author | Roshi, A. | |
dc.contributor.author | Shankar, N. Udaya | |
dc.contributor.author | Srivani, K. S. | |
dc.contributor.author | Subrahmanyan, R. | |
dc.contributor.author | Tingay, S. J. | |
dc.contributor.author | Waterson, M. | |
dc.contributor.author | Wayth, R. B. | |
dc.contributor.author | Webster, R. L. | |
dc.contributor.author | Whitney, A. R. | |
dc.contributor.author | Williams, A. | |
dc.contributor.author | Williams, C. L. | |
dc.date.accessioned | 2018-08-16T00:09:08Z | |
dc.date.available | 2018-08-16T00:09:08Z | |
dc.date.issued | 2016-04-01 | |
dc.identifier.citation | Giroletti , 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.issn | 0004-6361 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1602.08869v1 | |
dc.identifier.uri | http://hdl.handle.net/2299/20344 | |
dc.description | This 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.abstract | Low-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.extent | 9 | |
dc.format.extent | 313824 | |
dc.format.extent | 287673 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | |
dc.subject | astro-ph.HE | |
dc.title | High-energy sources at low radio frequency : the Murchison Widefield Array view of Fermi blazars | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1051/0004-6361/201527817 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true |