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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/005/01/0043-0053

    • Keywords

       

      radio continuum; Sgr A; galactic centre

    • Abstract

       

      The radio source Sgr A and neighbouring features have been mapped at a frequency of 843 MHz with a beamwidth of 43 × 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.

    • Author Affiliations

       

      B. Y. Mills1 M. J. Drinkwater1

      1. School of Physics, University of Sydney, N.S.W. - 2006, Australia
    • Dates

       
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