Interstellar Scattering of the Radio Source 2013+370
Abstract
We report the results of a six-station, 1663 MHz VLBI observation of the radio source 2013+370. The image of this source is dominated by interstellar scattering and is observed to be elliptical with a major axis (FWHM) of 17 mas and an axial ratio of 0.70. A fit of the observations to a model visibility function yields a value for α, the spectral index of the power-law density irregularity spectrum, of α = 3.79 +/- 0.05. Corrections for the finite angular size of the source would probably produce a downward revision of α. Other important characteristics of the image are its smooth character, with no evidence of multiple images, and stationarity over several hours as well as over a two-year interval since a previous observation. Our observations are consistent with the interstellar density spectrum being close to Kolmogoroff for those scales which determine the angular broadening.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1988
- DOI:
- 10.1086/166660
- Bibcode:
- 1988ApJ...332..346S
- Keywords:
-
- Extragalactic Radio Sources;
- Interstellar Extinction;
- Plasma Turbulence;
- Scattering;
- Very Long Base Interferometry;
- Computational Astrophysics;
- Stellar Spectra;
- Turbulent Flow;
- Astronomy;
- INTERFEROMETRY;
- TURBULENCE