IC443 - A Thermal Composite Remnant

This thermal composite remnant is a cross between a shell-like and Crab-like 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 predics 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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