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VLA Observations of Sgr A

Published online by Cambridge University Press:  04 August 2017

W. M. Goss ,
U. J. Schwarz ,
R. D. Ekers  and
J. H. van Gorkom
W. M. Goss
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands
U. J. Schwarz
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands
R. D. Ekers
Affiliation:
NRAO∗, Very Large Array Socorro, New Mexico, U.S.A.
J. H. van Gorkom
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands

Abstract

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The radio source Sgr A has been mapped with the Very Large Array (VLA) at 6 and 20 cm with an angular resolution of 5″ x 8″ arc. In agreement with the earlier “WORST” map, the non-thermal source Sgr A East shows a shell structure, while the thermal source Sgr A West shows a spiral-like morphology. We suggest that Sgr A East is a supernova remnant (SNR) near the galactic centre. Its surface brightness is the third largest in our galaxy after Cas A and the Crab Nebula. The diameter is 9 pc and the source fits the surface-brightness diameter relationship of Clark and Caswell (1976) if a distance of 10 kpc is assumed.

Type
I. Young Supernova Remnants
Information
Symposium - International Astronomical Union , Volume 101: Supernova Remnants and Their X-Ray Emission , 1983 , pp. 65 - 69
Copyright
Copyright © Reidel 1983 

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