Soft X-ray emission from SN 1987A's equatorial ring becomes broader and extends inward after ~2012, while hard X-rays remain compact, indicating growing contribution from reverse-shock-heated interior material.
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Chandra X-Ray Imaging and Spatially Resolved Spectroscopy of SN 1987A: Energy-Dependent Morphology of the Equatorial Ring
Soft X-ray emission from SN 1987A's equatorial ring becomes broader and extends inward after ~2012, while hard X-rays remain compact, indicating growing contribution from reverse-shock-heated interior material.