A Three-Dimensional Numerical Study of MHD Interaction between Supernova Remnants and Interstellar Wind

摘要

A three-dimensional numerical simulation of magnetohydrodynamics (MHD) interactions between supernova remnants and interstellar wind is analysed in this work. Interstellar wind is the relative motion of supernova remnant and surrounding interstellar medium (ISM). The speed of interstellar wind is presumed 40 km/s for the "weak" interstellar wind, which is corresponded to the Mach number of 4 in the ISM, as well as 200 km/s for the "strong" interstellar wind with Mach number 20. Direction of magnetic field is considered an orthogonal to the velocity of interstellar wind. Considered physical parameters of supernova remnants are similar to remnants of supernova Type Ⅰa. The numerical results are obtained for three time periods at the adiabatic stage evolution of a supernova remnant, at 7600, 31400 and 57700 years. The common dependences of these results are discussed. It is shown that interstellar wind could be one of the reasons for asymmetry of radiation intensity, which can be observed in several known supernova remnants.