The radio structure of SGR A

Details The radio structure of SGR A The radio structure of SGR A

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..143e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 143-150.

Astronomy and Astrophysics

Astronomy

188

Astronomical Maps, Galactic Nuclei, Galactic Structure, Radio Sources (Astronomy), Angular Resolution, Antenna Arrays, Hydrogen Clouds, Milky Way Galaxy, Radio Astronomy, Radio Telescopes, Thermal Emission

Scientific paper

The VLA has been used to map the continuum emission distribution of the radio source Sgr A at 6 and 20 cm, with a resolution of 5 x 8 arcsec. These maps are then used to obtain the spectral index distribution over Sgr A. A mapping resolution of 2 x 3 arcsec is achieved at 2 cm for the region near Sgr A West, where the thermal source has a spiral shape, with the compact point source close to, but not exactly coincident with, the peak in the thermal emission. A diffuse, nonthermal component is also present in Sgr A West, and the maps confirm the existence of a shell-shaped source with a nonthermal spectral index designated Sgr A East. Farther east from this source there exists a small cluster of compact thermal sources. Possible interpretations of these results are discussed.

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