Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26at....7...47s&link_type=abstract
Astronomical and Astrophysical Transactions (ISSN 1055-6796), vol. 7, no.1, p. 47-56
Astronomy and Astrophysics
Astrophysics
1
Asymmetry, Extragalactic Radio Sources, Frequency Distribution, Interstellar Matter, Low Frequencies, Radio Emission, Statistical Analysis, Variability, Astronomical Models, Mathematical Models, Refractivity, Scintillation, Time Series Analysis
Scientific paper
We report an asymmetry in the distribution of low frequency variable (LFV) radio sources towards the center-anticenter regions of our galaxy. The study is based on 14 years' monitoring of a large sample of sources observed with Culgoora Array at 80 and 160 MHz. This asymmetry is in marked contrast with the symmetrical distribution of non-variable sources from the same sample. Median values of the corresponding modulation indices on both short and long time scales also show a statistically significant increase towards the Galactic center compared with the anticenter region. These results strongly suggest that LFV has an interstellar origin and that the most likely mechanism is refractive scintillation.
Shapirovskaya Ya. N.
Slee Owen Bruce
Tsarevsky G. S.
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