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Compact Radio Sources in the Galactic Nucleus


SMALL-SCALE radio structure within Sgr A, the source identified with the galactic centre, is of great interest because of the recent discovery of similar structure in the infrared1 and because of current speculation on black holes in the galactic nucleus2. In this communication we describe new observations of Sgr A with the Cambridge 1 mile telescope at frequencies of 2.7 and 5 GHz. The beamwidths in right ascension were respectively 11 and 6 arcsec, the best of these being the highest resolution yet applied to the galactic centre. The observations suggest a three component model for Sgr A, and confirm the existence of radio structure on a scale of 10 arcsec. The relation of these compact radio sources to the infrared emission is also examined.

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DOWNES, D., MARTIN, A. Compact Radio Sources in the Galactic Nucleus. Nature 233, 112–114 (1971).

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