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dc.contributor.authorLovell, J.
dc.contributor.authorJauncey, D.
dc.contributor.authorBignall, Hayley
dc.contributor.authorKedziora-Chudczer, L.
dc.contributor.authorMacquart, Jean-Pierre
dc.contributor.authorRickett, B.J.
dc.contributor.authorTzioumis, A.
dc.date.accessioned2017-01-30T12:34:18Z
dc.date.available2017-01-30T12:34:18Z
dc.date.created2012-12-03T07:24:55Z
dc.date.issued2003
dc.identifier.citationLovell, J.E.J. and Jauncey, D.L. and Bignall, H.E. and Kedziora-Chudczer, L. and Macquart, J.-P. and Rickett, B.J. and Tzioumis, A.K. 2003. First results from MASIV: The microarcsecond scintillation-induced variability survey. The Astronomical Journal 126: pp. 1699-1706.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/22903
dc.identifier.doi10.1086/378053
dc.description.abstract

We are undertaking a large-scale, microarcsecond scintillation-induced variability survey, MASIV, of the northern sky (decl. > 0°) at 4.9 GHz with the VLA. Our objective is to construct a sample of 100 to 150 scintillating extragalactic sources with which to examine both the microarcsecond structure and the parent populations of these sources, and to probe the turbulent interstellar medium responsible for the scintillation. We report on our first epoch of observations, which revealed variability on timescales ranging from hours to days in 85 of 710 compact flat-spectrum sources. The number of highly variable sources, those with rms flux density variations greater than 4% of the mean, increases with decreasing source flux density, but rapid, large amplitude variables such as J1819+3845 are very rare. When compared with a model for the scintillation due to irregularities in an electron layer 500 pc thick, our preliminary results indicate maximum brightness temperatures 1012 K, similar to those obtained from VLBI surveys even though interstellar scintillation is not subject to the same angular resolution limit.

dc.publisherInstitute of Physics Publishing, Inc
dc.subjectISM: structure
dc.subjectradio continuum
dc.subjectgalaxies: active
dc.titleFirst results from MASIV: The microarcsecond scintillation-induced variability survey
dc.typeJournal Article
dcterms.source.volume126
dcterms.source.startPage1699
dcterms.source.endPage1706
dcterms.source.issn0004-6256
dcterms.source.titleThe Astronomical Journal
curtin.department
curtin.accessStatusOpen access via publisher


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