CO-13 in the inner galactic plane

Details CO-13 in the inner galactic plane CO-13 in the inner galactic plane

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..303l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. 303-313.

Astronomy and Astrophysics

Astrophysics

37

Astronomical Spectroscopy, Carbon Monoxide, Galactic Structure, Molecular Clouds, Astronomical Maps, Hydrogen, Molecular Spectroscopy, Velocity Distribution

Scientific paper

The (C-13)O survey of the galactic plane of Liszt et al. (1981) is extended over the longitude range 20.5-40.0 deg. The observations are used to discuss several properties of molecular clouds. It is shown that there is a continuous variation across the galactic disk in the ratio of abundances A (C-12)O/A (C-13)O. It is argued that this behavior arises from a larger mean column density per cloud nearer the peak of the molecular annulus than elsewhere. The statistics of CO and H I terminal velocities in the inner galaxy are considered and it is concluded that the molecular cloud kinematics may be better understood if the kinematic effects of observing a clumpy medium are taken into account. Values for the characteristic molecular cloud mean free path and cloud-cloud velocity dispersion are derived. A sample of some 200 lines of sight toward local material observed away from the galactic equator yields a value of 4.5 km/s for the dispersion in the solar vicinity.

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