Other
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..459l&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 459-464.
Other
10
Galactic Structure, H Ii Regions, Interstellar Masers, Milky Way Galaxy, Nebulae, Star Formation, Disk Galaxies, Gamma Rays, Hydroxyl Emission, Intergalactic Media, Molecular Clouds, Supernova Remnants
Scientific paper
A group of H II regions, type I OH masers, and other tracers of current star formation forms a tilted arc at least 2.4 kpc long at a distance of about 3.2 kpc from the galactic center. The feature appears to lie between the galactic center and the 3 kpc arm, and thus marks the inner boundary of star formation in the galactic disk. It shows no large noncircular velocities, suggesting that the peculiar motions associated with the 3 kpc arm are confined to an annulus less than 1 kpc in extent and do not pervade the entire inner Galaxy. The tilted arc is at southern longitudes; it has no northern counterpart. It is inclined in the same direction to the plane as the 3 kpc arm and the nuclear disk and like the 3 kpc arm, it is not a complete structure around the Galaxy.
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