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dc.contributor.authorBignall, Hayley
dc.contributor.authorLovell, J
dc.contributor.authorRickett, B.J.
dc.contributor.authorMacquart, Jean-Pierre
dc.contributor.authorJauncey, J.
dc.contributor.authorKedziora-Chudczer, L.
dc.contributor.authorOjha, Roopesh
dc.contributor.authorPursimo, T.
dc.contributor.authorSenkbeil, C.
dc.contributor.authorShabala, S.
dc.contributor.authorDutka, M.
dc.identifier.citationBignall, Hayley and Lovell, J. and Rickett, B.J. and Macquart, Jean-Pierre and Jauncey, J. and Kedziora-Chudczer, L. and Ojha, Roopesh and Pursimo, T. and Senkbeil, C. and Shabala, S. and Dutka, M. 2008. Interstellar scintillation, AGN physics and the SKA, in 18th National AIP Physics Congress, Australian Institute of Physics Conference Proceedings, Nov 30 2008, Adelaide, South Australia: Australian Institute of Physics AIP.

A large fraction of compact, extragalactic radio sources exhibit rapid variability at centimetre wavelengths as their radio emission is scattered by electron density fluctuations in the interstellar medium of the Galaxy. Next-generation wide-field radio telescopes will have to account for this in forming deep images of the radio sky. Interstellar scintillation offers a unique probe of very small-scale structure in both the ionized interstellar medium and the compact jets of the radio sources themselves. The effective resolution is two orders of magnitude higher than achievable with very long baseline interferometry. The recent Micro-Arcsecond Scintillation-Induced Variability Survey revealed a reduction in ISS at 4.9 GHz with increasing source redshift, implying either an increase in the apparent angular size of high-redshift radio cores beyond that expected due to a cosmological decrease in brightness, or a decrease in the microarcsecond-scale core dominance towards high redshift. The result could be due either to source-intrinsic evolution in the selected sample, or to scatter-broadening in the intergalactic medium.

dc.publisherAustralian Institute of Physics AIP
dc.titleInterstellar scintillation, AGN physics and the SKA
dc.typeConference Paper
dcterms.source.titleAustralian Institute of Physics Conference Proceedings
dcterms.source.seriesAustralian Institute of Physics
dcterms.source.conference18th National AIP Physics Congress
dcterms.source.conference-start-date30 Nov 2008
dcterms.source.conferencelocationAdelaide South Australia

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curtin.accessStatusOpen access
curtin.facultyDepartment of Medical Imaging and Applied Physics
curtin.facultySchool of Science
curtin.facultyFaculty of Science and Engineering

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