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The center of our galaxy

  • D. Downes
Part VII: H II Regions Associated with Nuclei of Galaxies
Part of the Lecture Notes in Physics book series (LNP, volume 42)

Abstract

Interferometer measurements show the galactic center source Sgr A to consist of a non-thermal source, Sgr A East, an H I[ Region, Sgr A West and an unusual point source. The properties of these sources are given below:
Sgr A East may be a supernova remnant near the galactic center. The H II Region Sgr A West has the following unique properties:
  1. i)

    Its position agrees with the centroid of the 2.2μ radiation, which is believed to come from stars at the galactic center.

     
  2. ii)

    It has a recombination line of halfwidth ∼200 km s−1, 4 to 5 times larger than that of any spiral arm H II region.

     
  3. iii)

    At its center lies the remarkable radio point source, which has a brightness temperature >107 K, and which may be the actual nucleus of the Galaxy. *** DIRECT SUPPORT *** A3418034 00012

     

Keywords

Point Source Flux Density Unique Property Spectral Index Brightness Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • D. Downes
    • 1
  1. 1.Max-Planck-Institut für Radioastronomie BonnFRG

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