A survey for metrewave variability in extragalactic radio sources.
Abstract
The authors report a detailed statistical study of the intensity variations in 412 extragalactic radio sources randomly selected from the ≡2000 sources which have been observed with the Culgoora circular array at 80 and 160 MHz during the interval 1970-84. The results are partly consistent with an origin in refractive scintillation by large-scale electron density turbulence in the intervening medium. There are, however, serious difficulties in explaining, from the existing theory of slow galactic scintillation, the short time-scale of the scintillation. The results are probably more in accord with the focusing and occulting effects of compact interstellar ionized structures recently identified at microwave frequencies.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- December 1988
- DOI:
- 10.1093/mnras/235.4.1313
- Bibcode:
- 1988MNRAS.235.1313S
- Keywords:
-
- Astronomical Models;
- Extragalactic Radio Sources;
- Sky Surveys (Astronomy);
- Spectral Energy Distribution;
- Correlation;
- Radio Transmission;
- Regression Analysis;
- Variability;
- Astronomy;
- Radio Sources:Extragalactic;
- Radio Sources:Scintillations;
- Radio Sources:Variability;
- Scintillations:Radio Sources