Radio studies of the Galactic center. I - The Sagittarius A complex

Details Radio studies of the Galactic center. I - The Sagittarius A complex Radio studies of the Galactic center. I - The Sagittarius A complex

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..769p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 769-784.

Astronomy and Astrophysics

Astronomy

130

Centimeter Waves, Galactic Nuclei, Galactic Structure, Milky Way Galaxy, Radio Astronomy, Active Galactic Nuclei, Sagittarius Constellation, Star Formation, Supernovae, Very Large Array (Vla)

Scientific paper

VLA observations of the Sgr A complex at 90 cm, 20 cm, and 6 cm are combined to obtain spectral index and optical depth distributions across the source and are used to constrain the three-dimensional structure at the Galactic center. At 90 cm the 'spiral' structure of the thermal source Sgr A West is clearly seen in absorption against the nonthermal emission of Sgr A East, showing conclusively that the former is in front of the latter. The entire shell of Sgr A East shows a low-frequency turnover corresponding to an optical depth of 1-2. This turnover corresponds to free-free absorption with an emission measure of about 100,000 pc/cm exp 6 if the electron temperature is about 5000 K. The approximately 7 arcmin halo surrounding Sgr A East and West also shows a low-frequency turnover. It is suggested that the halo contains a mixture of thermal and nonthermal gas and that the thermal component is responsible for the absorption extending across Sgr A East.

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