Time-dependent model of particle acceleration in the vicinity of approaching magnetohydrodynamic flows

15th Russian Youth Conference on Physics and Astronomy

物理学;天文学

Gladilin, P.E.^1,2 ; Bykov, A.M.^1,2 ; Osipov, S.M.^1,2

Ioffe Physical-Technical Institute of the Russian Academy of Sciences, Saint-Petersburg, Russia^1

Saint-Petersburg State Polytechnical University, Saint-Petersburg, Russia^2

关键词: High-energy particles;    Kinetic energy release;    Magneto-hydrodynamic flow;    Particle acceleration;    Star-forming region;    Supernova explosion;    Time-dependent diffusion;    Time-dependent models;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/461/1/012007/pdf
DOI  :  10.1088/1742-6596/461/1/012007

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Supernova explosions and powerful stellar winds with strong shocks can convert a sizeable part of the kinetic energy release into energetic particles. The starforming regions are argued as a favorable site of energetic particle acceleration and could be efficient sources of nonthermal emission. We present the analytic solution for the time-dependent diffusion-convection equation for the case of two approaching shocks. We also present here time-dependent model of particle acceleration in the vicinity of two closely approaching fast magnetohydrodynamic (MHD) shocks. Such MHD flows are expected to occur in rich young stellar cluster where a supernova is exploding in the vicinity of a strong stellar wind of a nearby massive star. We find that the spectrum of the high energy particles accelerated at the stage of two closely approaching shocks can be harder than that formed at a forward shock of an isolated supernova remnant. The presented method can be applied to model particle acceleration in a variety of systems with colliding MHD flows.