IC 443 - The interaction of a supernova remnant with a molecular cloud

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Astronomical Spectroscopy, Molecular Clouds, Particle Acceleration, Shock Wave Interaction, Supernova Remnants, Emission Spectra, Gas Dissociation, Hydrogen Clouds, Line Spectra

Scientific paper

The SNR IC 443 provides an excellent laboratory for studying the interaction of a supernova shock wave with a molecular cloud. Observations of shocked molecular hydrogen emission are reported, and compared with those of other shocked molecular species and with high-velocity atomic hydrogen. It is concluded that the shock is partially dissociative, leaving behind it shocked molecular gas and accelerated atomic gas, but little ionized gas. The cooling of the gas is consistent with H2 line emission and H2 dissociation providing the dominant cooling mechanisms, except possibly in the densest clumps, where far-infrared emission from collisionally heated grains may dominate. A model for IC 443 is presented, involving the SN explosion having taken place within the remains of a molecular disk left over from the process of formation of the star which exploded.

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