Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268l..85b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 268, May 15, 1983, p. L85-L88.
Astronomy and Astrophysics
Astrophysics
21
Galactic Nuclei, Gas Density, Interstellar Gas, Mass Distribution, Milky Way Galaxy, Astronomical Maps, Interferometry, Nonthermal Radiation, Radio Emission, Thermal Emission
Scientific paper
The galactic center was mapped with the VLA using a configuration optimized to emphasize low surface brightness features. It is found that the emission within 50 arcsec of the galactic center is a superposition of thermal and nonthermal radiation. In broad outline both the nonthermal source and the smaller region of extended thermal emission have the same morphology: they appear elliptical with their major axes aligned along b = 2.77 arcmin and with their centroids at or very near the position of the compact radio source Sgr A(asterisk). In addition, dense clumps of thermal emission appear to define a spiral-like pattern which also has its center of symmetry within 2 arcsec of Sgr A(asterisk). The gradients in gas density, synchrotron emissivity, and velocity dispersion outward from Sgr A(asterisk) suggest that a transient phenomenon is being viewed, such as an inflating supernova remnant, whose age is 7500-22,000 years.
Brown Raymon L.
Johnston Ken J.
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