Non-spherical supernova remnants. II - The interaction of remnants with molecular clouds

Astronomy and Astrophysics – Astrophysics

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Hydrodynamic Equations, Interstellar Matter, Molecular Clouds, Supernova Remnants, Ionizing Radiation, Morphology, Stellar Winds

Scientific paper

Two-dimensional numerical hydrodynamical calculations are presented which describe the evolution of a remnant resulting from supernova explosions of approximately 1051 erg in or near molecular clouds. Five evolutionary sequences are calculated for which the explosion site within the cloud is placed at different distances from the edge. In most cases the supernova shock reaches the edge of the cloud and breakout occurs. This phenomenon is characterized by a speeding up of the shock in the low-density intercloud medium and ejection of cloud material. The hydrodynamics of breakout are studied and the mass ejection is estimated as a function of the depth of the explosion and compared with that expected from H II regions undergoing the "champagne" phase. An additional sequence is calculated in which two explosions occur inside the cloud at different locations and different times. Finally, if a supernova explodes outside a cloud in a medium with much lower density than that of the cloud, there is little disruption of the cloud. Several calculations were repeated under the assumption of a non-radiative gas. The morphological appearance and evolution of these remnants are compared and contrasted with the solutions which include cooling.

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