Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..871k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 292, p. 871
Astronomy and Astrophysics
Astronomy
5
Molecular Clouds, Milky Way Galaxy, Velocity Distribution, Galactic Nuclei, Interstellar Matter, Hydrogen Clouds
Scientific paper
Molecular clouds in the Galactic center region typically have a velocity dispersion that can be larger by almost a factor of 2 compared with the velocity dispersion of similar mass clouds elsewhere in the Galaxy. However, there are at least two giant molecular clouds, and perhaps as many as half a dozen, located within a kpc of the Galactic center that have internal random velocities, observed in CO-12 and H I emission lines, that extend from about 0 to almost 200 km/s. This is larger by a factor of about 10 than normal giant molecular clouds. Two of the most prominent clouds have a molecular mass, estimated from the CO-12 emission, of about 10 exp 6 Me, and their atomic hydrogen mass is about 2 x 10 exp 6 solar masses. We consider various possible physical mechanisms for the large velocity dispersion of these clouds.
Kumar Pawan
Riffert Harald
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