Supernova remnants - the remaining material after the explosion of a high mass star - are sources of synchrotron emission. When a particle is accelerated in a magnetic field, the particle release high energy photons:

Supernova remnants will eventually disperse into the interstellar medium after around 100,000 years. During this time, they can look very similar to HII regions but will look very different in the radio spectrum. In addition, the expanding material moves at around 10,000 km/s and can expand to a diameter of about 100 parsecs.

Synchrotron sources like supernova remnants are best viewed in any wavelength other than visible light. An example of this is Cassiopeia A, a supernova remnant in the constellation Cassiopeia:

(Image Credit)

The wavelength that best shows this region is the radio spectrum.

When using spectroscopy to image a supernova remnant, the prominent emission line will be highly ionized Iron (Fe XXIV).

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