Scattering of radio emission from the compact object in Sagittarius A

Details Scattering of radio emission from the compact object in Sagittarius A Scattering of radio emission from the compact object in Sagittarius A

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222l...9b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 222, May 15, 1978, p. L9-L12.

Astronomy and Astrophysics

Astronomy

36

Galactic Nuclei, Interstellar Extinction, Milky Way Galaxy, Radio Scattering, Radio Sources (Astronomy), Astronomical Models, Brightness, Interstellar Matter, Plasma Turbulence, Very Long Base Interferometry

Scientific paper

It is noted that the compact object at the center of the Galaxy is angularly broadened by interstellar scattering to 1.4 arcsec at 1 GHz, so that the thermal plasma between the galactic center and earth may be classed with other regions of anomalous scattering situated along the lines of sight to the Vela pulsar, Cyg X-3, and perhaps distant molecular masers. The response of an interferometer to an extended source viewed through a turbulent plasma is analyzed, and relations are obtained which allow the strong dependence of the visibility function of Sgr A on radio frequency to be interpreted. It is proposed that all interferometric observations of Sgr A are consistent with interstellar scattering which obeys the Bramley (1955) equation for the mean interferometer amplitude response to a plane wave scattered by a slab of turbulent plasma. The location of the slab and physical conditions in it are considered. It is concluded that the scattering occurs in the vicinity of the galactic center and that the dissipative processes operate on kilometer scale lengths.

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