Non-thermal X-Rays from the Supernova Remnant G156.2+5.7

Recent observations revealed that several shelllike supernova remnants (SNRs) exhibit powerlaw spectra with no emission line which is considered to be synchrotron radiation from high energy electrons (> 1 TeV) accelerated by the Fermi process in the SNR shell. G156.2+5.7 is an old SNR (age virgul10E4 year), but emit hard Xrays in addition to usual thin thermal emission (virgul0.5 keV temperature). We propose to separately observe the thermal plasma and the hard Xray tail component. Our primary objective is to determine whether or not the hard Xray tail is synchrotron Xrays, and study the cosmic ray acceleration in this old SNR. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]