Theoretical models of interstellar shocks. I - Radiative transfer and UV precursors

Details Theoretical models of interstellar shocks. I - Radiative transfer and UV precursors Theoretical models of interstellar shocks. I - Radiative transfer and UV precursors

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..131s&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Jan. 1, 1979, p. 131-149.

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Astronomical Models, Interstellar Chemistry, Ionizing Radiation, Radiative Transfer, Shock Wave Propagation, Ultraviolet Radiation, Atomic Excitations, Emission Spectra, Gas Ionization, Ionization Cross Sections, Metal Ions, Radiant Flux Density, Shock Fronts, Supernova Remnants

Scientific paper

Theoretical models of interstellar radiative shocks are constructed, with special attention to the transfer of ionizing radiation. These models are 'self-consistent' in the sense that the emergent ionizing radiation (the UV precursor) is coupled with the ionization state of H, He, and the metals in the preshock gas. For shock velocities of at least 110 km/s the shocks generate sufficient UV radiation for complete preionization of H and He, the latter to He(+). At lower velocities the preionization can be much smaller, with important consequences for the cooling function, the shock structure, and the emission. For models with shock velocities of 40 to 130 km/s the intensities of the strongest emission lines in the UV, optical, and infrared are tabulated, as well as postshock column densities of metal ions potentially observable by UV absorption spectroscopy. Possible applications to supernova remnants and high-velocity interstellar gas are assessed.

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