Numerically investigating the peculiar periphery of a supernova remnant in the medium with a density gradient: the case of RCW 103

Abstract The young shell-type supernova remnant RCW 103 has peculiar properties in the X-ray morphology obtained with Chandra. southeastern shell is brighter X-rays, and curved border of this region flatter than other part.We investigate formation periphery using 3D hydrodynamical simulation. Assuming that ejecta been evolved medium a density gradient, detected shape can be generally reproduced. For 103, mass 3.0 M ? , background material 2.0 cm ?3 gradient 3.3 ? 4.0 pc ?1 simulation turned out asymmetry SNR mainly due to inhomogeneous gradient.