Radio observations of interstellar CH, Part 1

Details Radio observations of interstellar CH, Part 1 Radio observations of interstellar CH, Part 1

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975roich.........r&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Constellations, Interstellar Gas, Methane, Radio Observation, Traveling Wave Masers, Energy Levels, Gas Analysis, Molecular Excitation, Radio Astronomy, Radio Galaxies, Stellar Atmospheres, Tables (Data)

Scientific paper

Galactic observations of interstellar CH are presented. The observations are made with a traveling wave maser preamplifier, in the Onsala 25.6 telescope. This gives a zenith system noise temperature of about 34 K. Other interstellar gas species (such as CO, H2) are studied also. Theoretical considerations of excitation temperature and optical depth calculations are given. The CH energy level structure of the lowest ratational states is discussed in relation to the excitation of the radical by collisions. It is postulated that the deficiency in very dense molecular clouds is due to the radical being consumed by the formation of the observed, more complex molecules. No good agreement is found between the observations and existing theories of interstellar CH formation, which seem to underestimate the CH abundance.

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