Search for thermal X-ray features from the Crab nebula with the Hitomi soft X-ray spectrometer
Search for thermal X-ray features from the Crab nebula with the Hitomi soft X-ray spectrometer
The Crab nebula originated from a core-collapse supernova (SN) explosion observed in 1054 A.D. When viewed as a supernova remnant (SNR), it has an anomalously low observed ejecta mass and kinetic energy for an Fe-core collapse SN. Intensive searches were made for a massive shell that solves this discrepancy, but …