Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..761l&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 761-781.
Astronomy and Astrophysics
Astronomy
72
Dense Plasmas, Galactic Structure, H Ii Regions, Milky Way Galaxy, Nebulae, Radio Sources (Astronomy), Density Wave Model, Distribution (Property), Galactic Evolution, Galactic Nuclei, Kinematics, Radial Distribution, Radiant Flux Density
Scientific paper
The distribution of dense radio H II regions in the inner 100 deg of the galaxy is derived using kinematic models based on circular rotation and density-wave theory. A radio nebula is twice as likely to have an optical counterpart in the south as in the north, suggesting a preferential alignment of H II regions with respect to the obscuring matter. Southern nebulae are found to be within 3 kpc of the galactic center; northern nebulae extend inward only to 4 kpc. Kinematic models of the observed longitudes and velocities suggest that the nebulae are completely confined to a narrow pattern, much like a two-armed trailing spiral. The absence of dense nebulae from large areas of the galaxy that are well populated by H I and molecular clouds indicates that the formation of massive stars is not always a consequence of the presence of molecular clouds.
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