NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T22:18:42 PDT
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For refcode 1992A&A...264..203G:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1992A&A...264..203G Low-frequency variability and the galactic distribution of electron-density fluctuation T. Ghosh and A.P. Rao Radio Astronomy Centre, P.O. Box 8, Udhagamandalam 643 001, India Joint Astronomy Programme, Department of Physics, Indian Institute of Science, Bangalore 560012, India GMRT Project Office, T.I.F.R. P.O. Bag 3, Pune University Campus, Ganeshkhind, Pune 411007, India Received January 2, 1991; accepted February 17,1992 Abstract. A sample of 96 compact flat-spectrum extragalactic sources, spread evenly over all galactic latitudes, has been studied at 327 MHz for variability over a time interval of about 15 yr. The variability shows a dependence on galactic latitude being less both at low and high latitudes and peaking around |b|~15^deg^. The latitude dependence is surprisingly similar in both the galactic centre and anticentre directions. Assuming various single and multi-component distributions for the ionized, irregular interstellar plasma we have tried to generate the observed dependence using a semi-qualitative treatment of refractive interstellar scintillations. We find that it is difficult to fit our data with any single or double component cylindrical distribution. Our data suggests that the observed variability could be influenced by the spiral structure of our Galaxy. Key words: interstellar matter - scintillation - radio sources
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