Abstract Details

Name: Sriyasriti Acharya
Affiliation: IIT Indore
Conference ID: ASI2021_149
Title : Impact of Kelvin-Helmholtz instability on the non-thermal synthetic emission observed in magnetized jets
Authors and Co-Authors : Nikhil Borse (Indian Institute of Technology Indore), Sriyasriti Acharya (Indian Institute of Technology Indore), Bhargav Vaidya (Indian Institute of Technology Indore), Dipanjan Mukherjee (Inter-University Centre for Astronomy and Astrophysics), Gianluigi Bodo (INAF/Osservatorio Astrofisico di Torino, Italy), Paola Rossi (INAF/Osservatorio Astrofisico di Torino, Italy), Andrea Mignone (Dipartimento di Fisica Generale, Universita degli Studi di Torino, Italy)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : AGN jets exhibit multi-timescale variability and a broadband non-thermal spectrum extending from radio to gamma-rays. These jets remain stable up to large scales in-spite of suffering multiple magneto-hydrodynamic instabilities during their propagation in space. The main focus of this work is to bridge the gaps in our understanding of the underlying physical processes responsible for the above emission signatures. To achieve this, we perform high-resolution 3D MHD simulations of plasma columns at kilo-parsec scales in the non-relativistic regime that are prone to the Kelvin-Helmholtz instability. We investigate the dynamical and emission properties of jet configurations with different magnetic field profiles, jet speeds, and density contrast. From our study, we find that in a configuration with a dominant axial magnetic field, the shocks produced due to KH instability can strongly affect the jet dynamics. The inclusion of a helical magnetic field hinders the vortex growth at the shear surface, thereby stabilizing the jet column. The high energy electrons accelerated in the vicinity of freshly formed shocks in the configurations with dominant axial magnetic field can possibly explain the origin of spectral hardening in the high energy band.