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Paper: Properties of the Scattering Screen in Front of Scintillating Quasar PKS 1257-326
Volume: 365, SINS — Small Ionized and Neutral Structures in the Diffuse Interstellar Medium
Page: 290
Authors: Bignall, H.E.; Jauncey, D.L.; Lovell, J.E.J.; Tzioumis, A.K.; Macquart, J.-P.; Kedziora-Chudczer, L.
Abstract: PKS 1257–C326 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–C326. 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.
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