Spica and the Annual Cycle of PKS B1322-110 Scintillations

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aut.relation.endpage4381
aut.relation.journalMonthly Notices of the Royal Astronomical Societyen_NZ
aut.relation.startpage4372
aut.relation.volume487en_NZ
aut.researcherHutcheson, Catherine
dc.contributor.authorBignall, Hen_NZ
dc.contributor.authorReynolds, Cen_NZ
dc.contributor.authorStevens, Jen_NZ
dc.contributor.authorBannister, Ken_NZ
dc.contributor.authorJohnston, Sen_NZ
dc.contributor.authorTuntsov, AVen_NZ
dc.contributor.authorWalker, MAen_NZ
dc.contributor.authorGulyaev, Sen_NZ
dc.contributor.authorNatusch, Ten_NZ
dc.contributor.authorWeston, Sen_NZ
dc.contributor.authorMd Said, NMen_NZ
dc.contributor.authorKratzer, Men_NZ
dc.date.accessioned2019-08-12T03:09:38Z
dc.date.available2019-08-12T03:09:38Z
dc.date.copyright2019en_NZ
dc.date.issued2019en_NZ
dc.description.abstractPKS B1322–110 is a radio quasar that is located only 8.′5 in angular separation from the bright B star Spica. It exhibits intraday variability in its flux density at GHz frequencies attributed to scintillations from plasma inhomogeneities. We have tracked the rate of scintillation of this source for over a year with the Australia Telescope Compact Array, recording a strong annual cycle that includes a near-standstill in August and another in December. The cycle is consistent with scattering by highly anisotropic plasma microstructure, and we fit our data to that model in order to determine the kinematic parameters of the plasma. Because of the low-ecliptic latitude of PKS B1322–110 , the orientation of the plasma microstructure is poorly constrained. None the less at each possible orientation our data single out a narrow range of the corresponding velocity component, leading to a one-dimensional constraint in a two-dimensional parameter space. The constrained region is consistent with a published model in which the scattering material is associated with Spica and consists of filaments that are radially oriented around the star. This result has a 1 per cent probability of arising by chance.
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 487(3), 4372-4381.
dc.identifier.doi10.1093/mnras/stz1559en_NZ
dc.identifier.issn0035-8711en_NZ
dc.identifier.urihttps://hdl.handle.net/10292/12730
dc.publisherOxford University Press (OUP)en_NZ
dc.relation.urihttps://academic.oup.com/mnras/article/487/3/4372/5512609
dc.rightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 [owner as specified on the article] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.rights.accessrightsOpenAccessen_NZ
dc.subjectCircumstellar matter; Stars: Individual: Spica, ISM: General, ISM: structure, Radio continuum: Galaxies, Radio continuum: Transients
dc.titleSpica and the Annual Cycle of PKS B1322-110 Scintillationsen_NZ
dc.typeJournal Article
pubs.elements-id359625
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pubs.organisational-data/AUT/PBRF/PBRF Design and Creative Technologies
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