Properties of the Scattering Screen in Front of Scintillating Quasar PKS 1257-326

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dc.creatorBignall, H. E.
dc.creatorJauncey, D. L.
dc.creatorLovell, J. E. J.
dc.creatorTzioumis, A. K.
dc.creatorMacquart, J-P.
dc.creatorKedziora-Chudczer, L.
dc.date2007-02-01
dc.date.accessioned2026-07-07T07:44:10Z
dc.date.available2026-07-07T07:44:10Z
dc.descriptionPKS 1257-326 is a quasar showing extremely unusual, rapid interstellar scintillation (ISS), which has persisted for at least a decade. Simultaneous observations with the VLA and ATCA, combined with ATCA monitoring over several years, have revealed some properties of the turbulent ionized medium responsible for the ISS of PKS 1257-326. The scattering occurs in an unusually nearby (~10 pc), localized "screen". The scintillation pattern is highly anisotropic with axial ratio more than 10:1 elongated in a northwest direction on the sky. Recent findings and implications for small-scale ionized structures in the ISM are discussed.
dc.description6 pages, 3 figures, to appear in the ASP Conference Series, proceedings of "SINS - Small Ionized and Neutral Structures in the Diffuse Interstellar Medium", edited by M. Haverkorn and W. M. Goss, volume 365
dc.identifierhttps://arxiv.org/abs/astro-ph/0702026
dc.identifierhttp://arxiv.org/abs/astro-ph/0702026
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/123097
dc.subjectAstrophysics
dc.titleProperties of the Scattering Screen in Front of Scintillating Quasar PKS 1257-326
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