Publication Date:
2019-06-28
Description:
A powerful young supernova remnant (SNR) similar to Cas A has recently been discovered in the irregular galaxy NGC 4449. X-ray, optical and ultraviolet data have been obtained which allow possible models for this object to be investigated and its age to be estimated. Several lines of argument indicate a massive star of order 25 solar masses as the precursor to this remnant. If the X-ray emision is attributed to a reverse shock in the ejecta, the remnant should be about 120 years old.
Keywords:
ASTROPHYSICS
Format:
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