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Rapid Interstellar Scintillation of Quasar PKS 1257-326

Published online by Cambridge University Press:  30 March 2016

Hayley E. Bignall ,
David L. Jauncey ,
James E. J. Lovell ,
Anastasios K. Tzioumis ,
Jean-Pierre Macquart  and
Lucyna Kedziora-Chudczer
Hayley E. Bignall
Affiliation:
Joint Institute for VLBI in Europe, Radiosterrenwacht Dwingeloo, Postbus 2, 7990 A A Dwingeloo, The Netherlands
David L. Jauncey
Affiliation:
CSIRO Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia
James E. J. Lovell
Affiliation:
CSIRO Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia
Anastasios K. Tzioumis
Affiliation:
CSIRO Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia
Jean-Pierre Macquart
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands
Lucyna Kedziora-Chudczer
Affiliation:
Institute of Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia

Abstract

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PKS 1257—326 is one of three quasars known to show unusually large and rapid, intra-hour intensity variations, as a result of scintillation in the turbulent Galactic interstellar medium. We have measured time delays in the variability pattern arrival times at the VLA and the ATCA, as well as an annual cycle in the time-scale of variability for this source. Results of the two-station time delay observations are presented here. Implications for the scintillation of this source are discussed in the light of these results, together with results from two years of monitoring with the ATCA.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 703 - 708
Copyright
Copyright © Astronomical Society of Pacific 2005

References

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