Discovery of Year-scale Time Variability from Thermal X-Ray Emission in Tycho’s Supernova Remnant
Masamune Matsuda et al 2022 ApJ 940 105
Researchers detect for the first time X-ray emission from interstellar medium gas swept up by the expansion of Tycho’s supernova remnant — what’s left after a supernova that was observed in 1572.