IC443 - A Thermal Composite Remnant
This thermal composite remnant is a cross between a
and Crab-like (http://heasarc.gsfc.nasa.gov/docs/objects/snrs/crab-like.html) remnant.
To an x-ray astronomer, a composite remnant is one which shows shell-
type emission in the radio and plerionic emission in the x-ray. An example of
this type of remnant is IC 433.html (below). In this image, red shows
radio emission and blue shows X-ray emission. Theory
usually predicts that the dominant X-ray emission would be found on the
outside rim of the remnant, where the forward shock is located.
The spectrum of the x-rays from the center are thermal, or line dominated.
(Image courtesy of Jonathan Keohane).
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