Nucleosynthesis and Mixing in Cassiopeia A

摘要: We present results from the first light observations of Cassiopeia A supernova remnant (SNR) by Chandra X-Ray Observatory. Based on representative spectra four selected regions, we investigate processes nucleosynthesis and mixing in Cas A. make unequivocal identification iron-rich ejecta produced explosive silicon burning a young Galactic SNR. Elsewhere remnant, see silicon-rich oxygen burning. The Fe-rich lie outside Si-rich material, indicating that bulk motions were extensive energetic enough to cause spatial inversion significant portion core. It is likely this was caused "Fe"-rich emerging plumes rising bubbles neutrino-driven convection layer during explosion. In addition, radioactive decay energy 56Ni may have contributed subsequent evolution material. also discovered faint, well-defined filaments with featureless X-ray are possibly sites cosmic-ray acceleration