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dc.contributor.authorHancock, Paul
dc.contributor.authorDrury, J.
dc.contributor.authorBell, M.
dc.contributor.authorMurphy, T.
dc.contributor.authorGaensler, B.
dc.date.accessioned2017-01-30T12:33:32Z
dc.date.available2017-01-30T12:33:32Z
dc.date.created2016-11-17T19:30:19Z
dc.date.issued2016
dc.identifier.citationHancock, P. and Drury, J. and Bell, M. and Murphy, T. and Gaensler, B. 2016. Radio variability in the phoenix deep survey at 1.4 GHz. Monthly Notices of the Royal Astronomical Society. 461 (3).
dc.identifier.urihttp://hdl.handle.net/20.500.11937/22767
dc.identifier.doi10.1093/mnras/stw1486
dc.description.abstract

© 2016 The Authors. We use archival data from the Phoenix Deep Survey to investigate the variable radio source population above 1 mJy beam-1 at 1.4 GHz. Given the similarity of this survey to other such surveys we take the opportunity to investigate the conflicting results which have appeared in the literature. Two previous surveys for variability conducted with the Very Large Array (VLA) achieved a sensitivity of 1 mJy beam-1 . However, one survey found an areal density of radio variables on time-scales of decades that is a factor of ~4 times greater than a second survey which was conducted on time-scales of less than a few years. In the Phoenix deep field we measure the density of variable radio sources to be ? = 0.98 deg-2 on time-scales of 6 months to 8 yr. We make use of Wide-field Infrared Survey Explorer infrared cross-ids, and identify all variable sources as an active galactic nucleus of some description.We suggest that the discrepancy between previous VLA results is due to the different time-scales probed by each of the surveys, and that radio variability at 1.4 GHz is greatest on time-scales of 2-5 yr.

dc.publisherOxford University Press
dc.titleRadio variability in the phoenix deep survey at 1.4 GHz
dc.typeJournal Article
dcterms.source.volume461
dcterms.source.number3
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.departmentCurtin Institute of Radio Astronomy (Physics)
curtin.accessStatusFulltext not available


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