The Scorpius-Ophiuchus diffuse interstellar cloud

Details The Scorpius-Ophiuchus diffuse interstellar cloud The Scorpius-Ophiuchus diffuse interstellar cloud

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phdt.........3f&link_type=abstract

Ph.D. Thesis California Univ., Berkeley.

Physics

Cloud Physics, Free Radicals, Interstellar Gas, Absorption Spectra, Hydrogen, Ionization, Methane, Reaction Kinetics, Shock Waves

Scientific paper

The diffuse cloud in front of the Scorpius and Ophiuchus constellations was selected as a good region for testing theories about the interstellar formation of the diatomic radicals CH(+) and CH(q). Observations made for this study establish that the main absorption lines from interstellar CH(+) and CH(q) are formed at different velocities in front of chi Oph, and perhaps rho Oph, suggesting that these molecules are formed in different clouds. The cloud containing CH(+) is shown to be related to 21 cm filamentary structures in front of several Sco-Oph stars. Multiple cloud structure in front of zeta Oph is explained in terms of a model in which a shock wave propagates through a neutral hydrogen region. In this model, the CH(+) is formed at the rear of the transition zone and the CH(q) and other neutrals are formed in the cool post-shock cloud.

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