Abstract
THE radio source Sgr A, which is located at or near the galactic centre, has now been observed with high resolution (<1 arc min) at several frequencies between 327 and 15 GHz1–4. Downes and Martin3 have suggested that two main components are present between 1,400 and 5,000 MHz: Sgr A-West, identified with the galactic nucleus, coincides with the position of the 2.2 µm source of Becklin and Neugebauer5. Its size is about 45 arc s and it may contain smaller scale structure3,4. Sgr A-East, about 1.5 arc min to the east, is larger (∼2.5 arc min) and has a steeper spectrum3 so that it dominates at low frequencies.
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DULK, G., SLEE, O. Observations of Sgr A at 160 MHz with 1.9 arc min resolution. Nature 248, 33–34 (1974). https://doi.org/10.1038/248033a0
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DOI: https://doi.org/10.1038/248033a0
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