Radio study of the Arc and the Sgr A complex near the galactic center
Thesis/Dissertation
·
OSTI ID:6894620
Radio-continuum and radio-recombination-line observations of the inner degree of the galactic center reveal a rich collection of thermal and nonthermal radio structures: (a) A network of linear filaments that are oriented perpendicular to the galactic plane constitute the major portion of the radio Arc at l approx. 0.2/sup 0/. (b) A number of thread-like filaments are situated asymmetrical with respect to the galactic plane and appear to be isolated unlike the linear filaments which are grouped together. (c) A network of arched filamentary structures that is disorganized in its appearance constitutes the curved portion of the Arc. Radio-recombination-line emission from these filaments indicates a thermal character for the emission. (d) An interaction between the linear and arched filaments is implied, and the strength of the magnetic field along the linear filaments is estimated to be between 10/sup -3/ and 10/sup -4/ gauss. (e) A very steep-spectrum ridge of emission is seen to emerge from Sgr A as it extends perpendicular to the galactic plane. (f) The relative location of Sgr A East, West, a cluster of H II regions, and the 50 km s/sup -1/ molecular cloud are discussed. Comparison of the low and high-frequency maps show clearly that Sgr A East lies behind Sgr A West.
- Research Organization:
- Columbia Univ., New York (USA)
- OSTI ID:
- 6894620
- Country of Publication:
- United States
- Language:
- English
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