On The Study Of X-ray Emission From Several Young Supernova Remnants

Supernova Ramnants (known as SNR) are the leftovers of the supernova explosion.They provide important information of the supernovae and the physical mechanism oftheir explosion, especially the X-ray emission. Chandra X-ray satellite has higher spatialand energy resolution and sensitivity than all the other X-ray telescopes, and thus provideabundant observational data of very high quantity. In this thesis, we study the X-rayemission properties of young SNRs based on Chandra observations.The first part of our work in this thesis is the Cr emission line survey in youngsupernova remnants. The weak Cr/Mn emission lines open a new window to study theprogenitors of SNRs. We detect Cr/Mn and Fe emission lines in SNRs3C397, N103B and0519-69.0and give detail parameters of these lines, including line center energies, fluxes,and equivalent widths. From the equivalent width ratio of Cr and Fe lines (γCr/Fe), weconstrain the progenitor properties of these three SNRs. It is found that γCr/Fe>2%in all ofthe three SNRs, suggesting their delayed-detonation explosions of SN Ia.The second part is the high spatial resolution spectroscopy of SNR Kepler withChandra. We divide the SNR image into26×22grids and select regions with enoughphotons to generate spectra. From the spectra analysis, we get the physical properties ofthe different regions in Kepler, such as temperature, ionization age, element abundance,emission measure etc. We also get the correlation between different element abundance.We find a good positive correlation between Si/S/Fe abundance, suggesting their commonorigin in nucleosynthesis (incomplete explosive Si-burning and explosive O-burning).There is also a positive correlation between O/Ne abundance, suggesting them ashes ofexplosive Ne/C-burning.