Other
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.......289c&link_type=abstract
PhD thesis, Universidad Nacional Autònoma de Mèxico, (1992)
Other
6
Scientific paper
Standard models of inter-stellar shocks produce either strong H2 emission (magnetically controlled C-shocks) or strong optical and UV emission (J-shocks), but not both. Following a brief review of infrared and radio molecular emission of Herbig-Haro objects, a model for a J-shock with a magnetic precursor, which is produced when a shock wave propagates through a magnetized molecular medium, is presented. As part of these calculations, the level population and emission of molecular hydrogen, as well as its destruction by chemical reactions with other particles and dissociation by collision with atomic and molecular hydrogen and electrons, are taken in consideration. In this type of shocks, the H2 emission (infrared and ultraviolet) arises from the magnetic precursor, while the optical lines are emitted mainly by the gas behind the shock front. The results of this model show that hydrogen molecules radiate a considerably fraction of the total available energy in infrared lines, and that if H2 molecules reach the J-shock before being dissociated within the precursor, excitation of the Lyman and Werner bands by hot electrons could carry away an amount of energy comparable to that radiated by H2 infrared lines. Applying this plane-parallel model to the HH7 Herbig-Haro Object, it is found that this single model seems to explain most of the existing infrared observations of this object. A bow-shaped shock wave model is constructed using several plane-parallel J-shocks with magnetic precursors. This model reproduces with some detail not only the infrared and optical line intensities but also the line profiles, position-velocity diagrams and morphology obtained at optical and infrared wavelengths. Some predictions are made about the intensites, profiles and emission distribution of a number of lines which are likely to be corroborated in future observations. Finally, the plane-parallel models are used to investigate the infrared emission observed in the Cygnus Loop Supernova Remnant.
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