| Abstract : | The latest generation of radio telescopes, with their enhanced sensitivity and refined spatial resolution, are unveiling previously unidentified objects and capturing them with unprecedented details. One such enigmatic object is a radio galaxy in the Abell 3266 cluster named "MysTail," observed as part of the MeerKAT Galaxy Cluster Legacy Survey. Its unique ribbed tail, aptly named 'ribs,' and the thin filamentary structures that stretch between two bright patches, known as 'tethers,' situated far from the host, highlight the complex dynamics of large-scale relativistic jets. These intriguing morphologies might be attributed to fluctuating jets, a restarted AGN activity, or possibly dynamical instabilities within the jet. In this work, we aim to unravel the origin of such features using 3D relativistic MHD simulations with a particular focus on dynamical instabilities. Simulated jets from AGNs exhibit intricate structures influenced by various processes spanning vast spatial and temporal scales and thus represent a paramount challenge in astrophysical computations, both from dynamical and radiative aspects. In particular, we have performed simulations of a rotating jet and generated the synthetic synchrotron emission and polarization maps at radio frequencies using the hybrid Eulerian-Lagranian framework of PLUTO code. Studying synchrotron emission and polarization signatures is significant as they reflect upon the dominant spectral energy contribution from AGN jets and can provide insights into the intricate magnetic field orientations in these systems.
I shall showcase our results that provide a qualitative understanding of the physical processes governing the development of ribs and tethers in radio bands of kpc AGN jets. In particular, the presentation will furnish potential clues on the role of dynamic instabilities in forming these peculiar structures. |
