Supernova remnants in plane-stratified media - Predictions for H-alpha-emitting regions

Astronomy and Astrophysics – Astronomy

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Emission Spectra, H Alpha Line, Shock Wave Propagation, Supernova Remnants, Molecular Clouds, Plasma Bubbles, Stellar Evolution

Scientific paper

Numerical models for the time-dependent evolution of adiabatic SNRs in plane-stratified media are presented. These models approximate SNR evolution in the density distributions found near the edges of dense molecular clouds or diffuse stellar wind bubbles. Use of a simple T exp -1/2 cooling law enables cooling surfaces within the remnants to be identified and their H-alpha emission estimated. Projection of this emission onto the plane of the sky at a variety of angles of inclination, together with a consideration of the kinematics, allows comparisons with observed remnants to be made. It is found that the phenomenon of fast H-alpha emission, as observed in the Cygnus Loop and N49 and N63 in the LMC, can be easily explained as a consequence of SNR evolution in regions having high density contrasts.

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