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The young shell-type supernova remnant RCW 103 has peculiar properties in theX-ray morphology obtained with Chandra. The southeastern shell is more brighterin the X-rays, and the curved border of the shell in this region is moreflatten than the other part. We investigate the formation of the peculiarperiphery of the supernova remnant RCW 103 using 3D hydrodynamical simulation.Assuming that the supernova ejecta has been evolved in the medium with adensity gradient, the detected shape of the periphery can be generallyreproduced. For RCW 103, with the ejecta mass of $3.0~M_{\odot}$, the densityof the background material of $2.0~\mathrm{cm}^{-3}$, and a gradient of $3.3 -4.0 ~\mathrm{cm}^{-3} \mathrm{pc}^{-1}$, the X-ray periphery can be generallyreproduced. The simulation turned out that the asymmetry of the SNR RCW 103 ismainly due to the inhomogeneous medium with a density gradient.

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