Abstract
The interaction of a bubble of relativistic fluid created by pulsar energy input with an ambient meium is studied by means of self-similar solutions. Three possible ambient media are considered: a stationary, uniform medium; a medium created by a slow, steady presupernova wind; and a uniformly expanding medium created by a supernova explosion. The three situations lead to shells of shocked gas with different thicknesses and internal structures. The third case leads to a cooler shell than the other two. The models are applied to the Crab nebula. Current observations do not distinguish betwen the various models, but X-ray, radio, and ooptical observations are proposed which will be helpful in resolving this problem. The solution will indicate whether SN 1054 was an anomalously low-energy event.
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