Thermal Conduction Models for Mixed Morphology Remnants

Astronomy and Astrophysics – Astrophysics

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Scientific paper

A new type of supernova remnants, called ``thermal composite'' or ``mixed morphology'' has been characterized using ROSAT and ASCA observations (Rho & Petre 1998). These remnants have thermal X-ray interiors and radio shells, and their place in standard remnant evolution has been hotly debated. Two models have been proposed, one suggesting they are due to evaporating cloudlets (White & Long 1991) in a diffuse medium, and the other suggesting that they are formed by thermal conduction operating in a denser uniform medium (Cox et al. 1999). The thermal conduction model has now been applied to a number of remnants (W44, G290.1-0.8, and G272.2-3.2) and we can begin to make some general comments about its successes and failures. By creating a grid of model solutions, and extracting results along lines of constant surface brightness, it is possible to characterize remnants which may be fit with a thermal conduction model and which cannot. We will also discuss specific model predictions for various optical and UV lines, as well as the effect of including supernova ejecta in the model. We gratefully acknowledge support for this work from NASA grant NAG5-9132.

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