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Interplay of various particle acceleration processes in astrophysical environment

Published online by Cambridge University Press:  20 January 2023

Sayan Kundu Open the ORCID record for Sayan Kundu [Opens in a new window]  and
Bhargav Vaidya
Sayan Kundu*
Affiliation:
Department of Astronomy, Astrophysics and Space Engineering Indian Institute of Technology, Indore Madhya Pradesh, India - 452020
Bhargav Vaidya
Affiliation:
Department of Astronomy, Astrophysics and Space Engineering Indian Institute of Technology, Indore Madhya Pradesh, India - 452020
*
*sayan.astronomy@gmail.com
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Abstract

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Astrophysical systems possess various sites of particle acceleration, which gives rise to the observed non-thermal spectra. Diffusive shock acceleration (DSA) and stochastic turbulent acceleration (STA) are the candidates for producing very high energy particles in weakly magnetized regions. While DSA is a systematic acceleration process, STA is a random energization process, usually modelled as a biased random walk in energy space with a Fokker-Planck equation. In astrophysical systems, different acceleration processes work in an integrated manner along with various energy losses.

Here we study the interplay of both STA and DSA in addition to various energy losses, in a simulated RMHD jet cocoon. Further, we consider a phenomenologically motivated STA timescale and discuss its effect on the emission profile of the RMHD jet. A parametric study on the turbulent acceleration timescale is also conducted to showcase the effect of turbulence damping on the emission structure of the simulated jet.

Keywords

Acceleration of particlesRadiation mechanisms: nonthermalPlasmasTurbulence
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S362: The Predictive Power of Computational Astrophysics as a Discovery Tool , June 2020 , pp. 365 - 372
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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