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  • School of Engineering, Computer and Mathematical Sciences - Te Kura Mātai Pūhanga, Rorohiko, Pāngarau
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Spica and the Annual Cycle of PKS B1322-110 Scintillations

Bignall, H; Reynolds, C; Stevens, J; Bannister, K; Johnston, S; Tuntsov, AV; Walker, MA; Gulyaev, S; Natusch, T; Weston, S; Md Said, NM; Kratzer, M
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http://hdl.handle.net/10292/12730
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Abstract
PKS 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.
Keywords
Circumstellar matter; Stars: Individual: Spica, ISM: General, ISM: structure, Radio continuum: Galaxies, Radio continuum: Transients
Date
2019
Source
Monthly Notices of the Royal Astronomical Society, 487(3), 4372-4381.
Item Type
Journal Article
Publisher
Oxford University Press (OUP)
DOI
10.1093/mnras/stz1559
Publisher's Version
https://academic.oup.com/mnras/article/487/3/4372/5512609
Rights Statement
This 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.

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