What is the significance of 'evolved remnants' in morphological descriptions?
Answer
They represent the very late stages where the structure is highly irregular, fragmented, and diffuse as it merges with the interstellar medium.
The term 'evolved remnants' designates structures that have reached the furthest extent of their visible life cycle before completely dissipating into the interstellar medium. In these late stages, the coherent blast wave structure is lost, and the remnant appears highly disorganized. The material has dispersed and fragmented significantly, often merging with or being dominated by interactions with surrounding molecular clouds. This morphology contrasts sharply with the organized shell structures seen in younger or middle-aged remnants.
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