Synthesis of interstellar CH^+ without OH

Details Synthesis of interstellar CH^+ without OH Synthesis of interstellar CH^+ without OH

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279l..41f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 279, Issue 3, pp. L41-L46.

Astronomy and Astrophysics

Astronomy

28

Mhd, Molecular Processes, Ism: Abundances, Cosmic Rays, Ism: Kinematics And Dynamics, Ism: Molecules

Scientific paper

Both CH^+ and OH can be produced in warm gas via endothermic reactions, yet recent observations by Federman, Weber & Lambert indicate little correspondence between the abundances for these molecules. A non-thermal origin for CH^+ production is therefore suggested. Chemical models of diffuse cloud envelopes that include the presence of Alfven waves are shown to be consistent with the new observations. In these models, CH^+ is formed as a result of the streaming of C^+ ions, which are influenced by the passage of Alfven waves, relative to the cold background gas. Since the background gas is cold, OH production arises solely from ion-molecule reactions initiated by cosmic ray ionization.

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