PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Direct, CRD)
Evolution of a Non-Isotropic SN remnant in a Turbulent Background Medium
P.S.Β Holt* and G.Β Li
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Pre-published on: July 25, 2023
Published on: β€”
We examine how the characteristics of Supernova remnant (SNR) shocks evolve in a non-uniform
background with a non-isotropic ejection using the MHD code of Athena++. As an example, the
remnant SN1006 is modelled using various scenarios. The turbulent density and magnetic field in
the background interstellar medium (ISM) are assumed to have a Kolmogorov spectrum. Using
the spherical harmonic function π‘Œπ‘™,π‘š (πœƒ, πœ™) as a basis, we model the non-isotropic ejection also by
a Kolmogorov-like spectrum in (l,m). We consider cases where the ejecta speed in one direction
differs significantly from other directions by adding a Gaussian profile to the ejection profile.
Simulation results are compared to cases of an isotropic supernova explosion in both a uniform
and non-uniform background. We find that the morphology of the SNR shock looks noticeably
different at earlier times for different scenarios. In later times, ∼ 1, 000 years, the differences
become smaller. Synthetic synchrotron radiation maps for different scenarios are obtained and
compared to observations.
DOI: https://doi.org/10.22323/1.444.0135
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