The X-ray Study of Small-Scale Shock Structures in the Non-thermal SNRs

摘要

The shock front of SNRs is the most probable acceleration site of high energy particles(up to,or more than TeV)as already confirmed by the hard X-ray observations of the synchrotron emission from accelerated electrons.The remarkable spatial resolution of the X-ray observatory Chandra enables us to investigate the small-scale structure of the spatial distribution of accelerated electrons close to the shock front,which may lead us to deep understanding of acceleration mechanism.We have found hard X-ray filaments having a sharp rise in upstream and rather slow decay in downstream from the shocked region of six SNRs(Cas A,Tycho,Kepler,SN 1006,RCW 86,and 30 Dor C)using the Chandra archive data.For all the SNRs,we found that the scale width of the filaments is significantly smaller than that of the thermal plasma derived from the Sedov solution,The scale width becomes larger as increasing radius of the SNR,which may be followed by the understanding of the history of acceleration and energy loss of electrons in the shock front.