Theoretical studies of interstellar molecular shocks. VII - The photodissociation of molecular hydrogen

Details Theoretical studies of interstellar molecular shocks. VII - The photodissociation of molecular hydrogen Theoretical studies of interstellar molecular shocks. VII - The photodissociation of molecular hydrogen

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..863m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Oct. 15, 1988, p. 863-872. SERC-supported research

Astronomy and Astrophysics

Astronomy

18

Hydrogen, Interstellar Chemistry, Molecular Clouds, Photodissociation, Ultraviolet Radiation, Ambipolar Diffusion, Background Radiation, Lyman Spectra, Molecular Rotation, Ophiuchi Clouds, Shock Waves

Scientific paper

Previous models of interstellar shocks have neglected the photodissociation of molecular hydrogen, supposed to be "self-shielded" from the background ultraviolet field. The authors show that the thermal broadening and Doppler shifting of lines in the Lyman and Werner bands, within a magnetohydrodynamical shock, lead to partial photodissociation of H2. Because H2 is at the root of the gas-phase chemistry and is also the principal coolant of the hot gas, its photodissociation has significant effects on the structure of the shock. The authors find that the inclusion of the process of H2 photodissociation tends to aggravate difficulties previously encountered in simultaneously accounting for the column densities of CH, CH+, OH, and rotationally excited H2 along the line-of-sight to ζ Oph.

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