Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..408d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. 408-418. Research supported by the Alfred P. Sloan Fo
Astronomy and Astrophysics
Astrophysics
54
Astronomical Models, Line Of Sight, Magnetohydrodynamic Waves, Molecular Clouds, Ophiuchi Clouds, Shock Waves, Chemical Composition, Gas Density, H Ii Regions, Radial Velocity
Scientific paper
Multifluid C-type shock models are presented for the gas on the line of sight toward Zeta Oph and compared with observational data. A shock model of a 9 km/s-shock propagating into diffuse molecular gas with n(H) of 20/cm, and H2/H of 3 is in good agreement with the observed column density and radial velocity of the CH(+) and is consistent with observational limits of column densities of the OH and CH. The preferred shock model predicts that a large fraction of the J = 3-5 H2 on this line of sight is due to collisional excitation in the shock-heated gas. The dominant molecular component present on this line of sight is interpreted as shock-compressed material behind the shock front. It is considered to be likely that the shock wave is driven by the pressure of the Zeta Oph H II region.
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