Carbon monoxide in the Galaxy. II - The thickness of the galactic CO layer

Details Carbon monoxide in the Galaxy. II - The thickness of the galactic CO layer Carbon monoxide in the Galaxy. II - The thickness of the galactic CO layer

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207l.189b&link_type=abstract

Astrophysical Journal, vol. 207, Aug. 1, 1976, pt. 2, p. L189-L193.

Astronomy and Astrophysics

Astrophysics

44

Carbon Monoxide, Galactic Structure, Interstellar Gas, Milky Way Galaxy, Astronomical Maps, Atmospheric Models, Hydrogen Clouds, Velocity Distribution

Scientific paper

Observations of the 2.6-mm line of (C-12)O, made at 21 deg longitude between +2 and -2 deg latitude are modeled well by a Gaussian distribution in z of dispersion 50 + or - 10 pc. The model consists of a stochastic assemblage of dark clouds, each having a diameter of 5 pc, an excitation temperature of 16 K, a representative optical depth of 5, an internal dispersion of 2.5 km/s, and a cloud-to-cloud separation of 800 pc at the mode (5.8 kpc) of the previously observed variation with galactocentric radius. Presumably these parameters also describe H2 in the Galaxy. Comparison with H I observations clearly show the molecular layer to be thinner and more clumpy than the much more ubiquitous atomic hydrogen.

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