Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..203g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 203-216.
Astronomy and Astrophysics
Astrophysics
15
Electron Density (Concentration), Extragalactic Radio Sources, Variability, Astronomical Models, Galactic Structure, Milky Way Galaxy, Point Sources
Scientific paper
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 about 15 deg. The latitude dependence is surprisingly similar in both the galactic center and anticenter directions. Assuming various single and multicomponent distributions for the ionized, irregular interstellar plasma, we have tried to generate the observed dependence using a semiqualitative 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.
Ghosh Tamal
Pramesh Rao A.
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