Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..495a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 495-502. Research supported by the Universidad de Ch
Astronomy and Astrophysics
Astrophysics
34
Galactic Rotation, Milky Way Galaxy, Molecular Clouds, Carbon Monoxide, Southern Sky, Velocity Distribution
Scientific paper
A rotation curve for the Galaxy within the solar circle is found using data from the fourth Galactic quadrant. The observations are consistent with a picture in which the Galaxy rotates with a circular velocity of 209 + or - 2 km/s between Galactocentric distances of 0.24 and 1.0 solar radius. Clouds associated with a part of the Carina spiral arm exhibit an average rotation velocity 12 km/s higher than expected, implying an apparent anomalous motion. An excess in velocity of about the same magnitude observed at the tangent direction of the Centaurus arm is attributed to streaming and internal motions of large molecular complexes. Similar phenomena found in the Sagittarius and Scutum arms by northern observers strongly support the hypothesis that Carina is the continuation of the Sagittarius arm and Centaurus is that of the Scutum arm.
Alvarez Hector
Bronfman Leonard
May Jorge
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