ASCA observations of the supernova remnant G156.2+5.7 Original Research Article

We report on the X-ray spectra in the wide energy band from the north rim and the central regions of the supernova remnant G156.2+5.7 obtained with ASCA. No clear shell structure is found: the surface brightness in the north rim is nearly the same as that in the center. The spectra from the north rim and the central regions are composed, at least, of 2 components: one is a thin thermal component with a temperature of about 0.4 keV and the other is a hard component represented by either a thin thermal emission model with a temperature higher than a few keV or a power-law model with a photon index of ∼2. Si and S abundances in the central region are found to be 3–10 times larger than those in the north rim region. Results of simultaneous fits of the ASCA and the Ginga spectra are also presented.