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Study of the effect of turbulent interstellar mediums on young supernova remnant morphology

Gabriel Rigon (1)Tsuyoshi Inoue (12) ( (1) Graduate School of ScienceNagoya University(2) Department of PhysicsKonan University )
Dec 2022
Context. Supernova remnants (SNR) are one of the main sources of galacticcosmic rays acceleration. This acceleration, believed to happen at the blastwave front, leads to an energy loss at the shock front. This results in theapparent proximity between the blast wave and the contact discontinuity. Aims.In this article, we study the effect that turbulent-like density perturbationsof the interstellar medium (ISM) have on the evolution of young SNRs. We focuson the impact such fluctuations have on the SNRs structure and more preciselyon the resulting distance between blast wave and contact discontinuity. Sincecosmic rays acceleration is necessary to explain this distance, this studyindirectly put into question the cosmic rays acceleration at the blast wavefront. Methods. We performed a set of purely hydrodynamic three-dimensionalsimulations without cosmic ray acceleration in a co-expanding frame. Werandomly initialised the density variation of the interstellar medium followinga Kolmogorov power law. The resulting ratios of radii between blast wave,contact discontinuity and reverse shock are then compared to the astronomicalobservations. Results. The addition of density perturbation doesntsignificantly change the average ratio of radii. However, the simulations showa higher growth of interfacial instabilities in the presence of a turbulentISM. The resulting deformation of the contact discontinuity could explain theproximity between contact discontinuity and blast wave. They also explain theplateau in the radial distribution of the line of sight velocity associatedwith the observations of Tycho. Conclusions. The density perturbation of theISM should not be neglected in the simulation of young SNR as they have animpact comparable to the cosmic rays acceleration on the SNR structure.