Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280..447f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 2, pp. 447-457.
Astronomy and Astrophysics
Astronomy
43
Mhd, Shock Waves, Ism: Jets And Outflows, Ism: Molecules
Scientific paper
We compute the yields of Si and O in the sputtering of SiO_2 by He^+ ions, and of C from graphite. The sputtering threshold energy, particularly for the ejection of Si, is significantly higher than indicated by previous studies. The computed yields are incorporated in a C-shock code to study SiO formation in gas where the density is initially n_H=10^4 cm^-3 and the transverse magnetic induction is 100 muG. Collisional processes leading to the excitation and the dissociation of H_2, and to the associated ultraviolet fluorescence radiation, are included in the model. We find that the electron temperature profile is crucial to the dynamical and chemical structure of the shock. The electron temperature can be significantly enhanced by interactions with negative ions, such as PAH^-. The column densities of SiO computed for shock velocities nu_s~=50 km s^-1 are of the order of those observed in molecular outflow regions.
Field David
Flower David R.
May P. W.
Pineau des Forêts Guillaume
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