Mathematics – Probability
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306...16l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 16-24.
Mathematics
Probability
38
Galactic Structure, Interstellar Gas, Mass Distribution, Molecular Clouds, Star Distribution, Astronomical Maps, Carbon Monoxide, Cosmic Dust, Cosmic Gases, Cosmic Rays, Flares, Solar System
Scientific paper
Two large-scale CO surveys have been performed in Cepheus and in Aquila, Resulting in the first case in the discovery of one of the major molecular complexes close to the sun. Cepheus looks very similar to Orion, the typical giant molecular cloud in the solar neighborhood. In contrast, only a few small clouds have been found in Aquila. These results indicate that the Lick galaxy counts catalog, taken at face value, is not a reliable gas tracer. It is shown that the number density of galaxies depends as much on the field star density as on the gas density, as traced by the 21 cm line. The net result is that the probability of detecting a galaxy in a star field decreases exponentially with the star density. A correction for this effect is proposed, and leads to a new picture of the gas distribution in the solar neighborhood in very good agreement with large-scale CO observations.
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