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Conference Papers Year : 2021

Nonlinear particle reacceleration by successive shocks

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Abstract

Multiple shock acceleration is thought to take place in various environments, including chaotic winds, accretion disks and superbubbles. In the latter, multiple supernovae may explode within small timescales in compact regions and successively reaccelerate the distribution of cosmic rays which do not have time to escape far away from the star cluster. Reacceleration by successive shock waves is therefore expected to take place. We develop a model of nonlinear shock reacceleration and show that the downstream distribution of particles rapidly reach an asymptotic concave solution, such that the cosmic ray pressure saturates at the level of a few percent of the hydrodynamic pressure.
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Dates and versions

hal-03601149 , version 1 (22-11-2022)

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Thibault Vieu, Stefano Gabici, Vincent Tatischeff. Nonlinear particle reacceleration by successive shocks. 37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.148, ⟨10.22323/1.395.0148⟩. ⟨hal-03601149⟩
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