Abstract Details

Name: Sayan Kundu
Affiliation: Indian Institute of Technology, Indore
Conference ID: ASI2021_447
Title : Numerical Modelling to study interplay of particle acceleration processes in astrophysical plasma
Authors and Co-Authors : Sayan Kundu (Indian Institute of Technology, Indore), Bhargav Vaidya (Indian Institute of Technology, Indore)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : AGN Jets are observed to possess various sites for particle acceleration, which gives rise to the observed non-thermal spectra. Diffusive shock acceleration and stochastic turbulent acceleration are claimed to be the candidates for producing very high energetic particles. The stochastic turbulent acceleration is a random energization process, where the interaction between cosmic ray particles and electromagnetic fluctuations could lead to both particle acceleration and deceleration. Due to this randomness in energy gain, the stochastic turbulent acceleration is usually modelled as a biased random walk in energy space with a Fokker-Planck equation. Due to the ubiquitous nature of plasma fluctuations, stochastic turbulent acceleration gives rise to diffuse emission, whereas shock acceleration leads to localized emission. In astrophysical systems, different acceleration processes work in an integrated manner along with various energy losses. Here I will present our novel method of implementing stochastic acceleration in the hybrid Eulerian-Lagrangian framework that accounts for diffusive shock acceleration in the presence of radiative processes like synchrotron and IC emission. The focus would be to showcase the interplay between the particle acceleration process due to shocks and turbulence. Further, I will also present the application of these acceleration mechanisms in governing the non-thermal emission from AGN jets and also their role in controlling particle spectra in blazars.