IRAS observations of collisionally heated dust in Large Magellanic Cloud supernova remnants

Astronomy and Astrophysics – Astronomy

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Cosmic Dust, Infrared Spectra, Magellanic Clouds, Particle Collisions, Plasma Heating, Supernova Remnants, Far Infrared Radiation, Infrared Astronomy Satellite, Stellar Evolution

Scientific paper

IRAs additional observations are presented which show that luminous far-infrared sources are associated with the Large Magellanic Cloud supernova remnants N63A, N49, N49B, and N186D. Comparison of the infrared and X-ray data shows that a substantial fraction of the infrared emission from three of the remnants can be accounted for by collisionally heated dust. The ratio of dust-grain cooling to total atomic cooling by lines, recombination, and bremsstrahlung is about 10 in X-ray emitting gas. The evolution of a supernova remnant in a two-phase interstellar medium is considered, and it is concluded that dust cooling will not dominate supernova remnant evolution, but it probably accelerates the process.

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