Physics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phys...17..175o&link_type=abstract
(Niels Bohr Institut, Teknisk Videnskabelige Forskningsrad, and Nordisk Institut for Teoretisk Atomfysik, Symposium on Quasars a
Physics
3
Galactic Nuclei, Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Hydrogen Ions, Star Clusters, Supergiant Stars
Scientific paper
Expansion near the center of the Milky Way is described in four categories: (1) features observed in the 21 cm line, e.g., objects at a radius between 1 and 4 kpc where the velocity components (50-170 kms) are usually directed away from the center, including large (2-80 million solar masses) features with arm-like structures, and quiescent hydrogen; (2) dense molecular clouds within a 250 pc radius, with asymmetrical distribution and movement along eccentric paths resulting from expulsion from the center, e.g., a dense molecular ring expanding at approximately 150 kms; (3) an arc-like structure of ionized hydrogen at a radius of 40 pc, also, presumably, ejected from the center; and (4) high velocity (200 kms) turbulent gas at 1-2 pc from the center, with a strong concentration of radiation at wavelengths of 10 micrometers or longer (due to dust heated by supergiants or star clusters). Attention is given to H I features, and to the radio source in Sagittarius A, which is said to contain an extremely compact component (10 AU) containing the energy required for the expulsive phenomena
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