Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984japa....5...43m&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 5, March 1984, p. 43-53.
Astronomy and Astrophysics
Astronomy
15
Galactic Nuclei, Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Radio Sources (Astronomy), Radio Spectra, Astronomical Maps, Continuous Spectra, Ionized Gases, Plasma Jets, Supernova Remnants
Scientific paper
The radio source Sgr A and neighbouring features have been mapped at a frequency of 843 MHz with a beamwidth of 43 x 87 arcsec. Comparisons have been made with published maps of comparable resolution at different frequencies in order to differentiate thermal and nonthermal regions. The arc feature to the north of Sgr A appears to consist of low-temperature ionized hydrogen and to extend partly over Sgr A itself causing patchy absorption at low frequencies; there is some evidence that the hydrogen in the arc has been expelled from the galactic nucleus. Previous suggestions that Sgr A East is a supernova remnant have been examined and the interpretation is found to be quite likely, but not compelling. The diffuse component of Sgr A West appears to be due entirely to ionized hydrogen surrounding the nucleus.
Drinkwater Michael. J.
Mills B. Y.
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