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Interstellar Scintillation Explains the Intraday Variations in the Linear Polarisation of Quasar PKS 0405-385 at cm-wavelengths

Published online by Cambridge University Press:  05 March 2013

Barney Rickett ,
Lucyna Kedziora-Chudczer  and
David L. Jauncey
Barney Rickett
Affiliation:
University of California San Diego, La Jolla, CA92093, USA; [email protected]
Lucyna Kedziora-Chudczer
Affiliation:
Australia Telescope National Facility and Anglo-Australian Observatory, Sydney, Australia; [email protected]
David L. Jauncey
Affiliation:
Australia Telescope National Facility, Sydney, Australia; [email protected]
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Abstract

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During its burst of intraday variation (IDV) in June 1996 quasar PKS 0405–385 exhibited rapid changes in the Stokes parameters Q and U that were even faster than the 1 hr timescale changes in I. Auto- and cross-correlation analyses of I,Q, and U at 8.6 GHz show systematic relations between the variations in I,Q, and U. These are well modelled by interstellar scintillation (ISS) of a 14 × 20 μ as source, with about 180 degree rotation of the polarisation angle along its long dimension. This success in explaining the remarkable IDV in polarisation confirms that ISS gives rise to the IDV in this quasar.

Keywords

galaxies: nucleigalaxies: jetsradio continuum: galaxiesscatteringgalaxies: ISM
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 19 , Issue 1 , 2002 , pp. 106 - 110
Copyright
Copyright © Astronomical Society of Australia 2002

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