| Name: | CHANDAN KUMAR DAS |
| Affiliation: | Indian Institute of Technology Indore |
| Conference ID : | ASI2024_431 |
| Title : | Role of magnetic reconnection in variability of Blazars using numerical simulations |
| Authors : | Chandan Kumar Das1, Bhargav Vaidya1, Amit Shukla1 |
| Authors Affiliation: | 1 Indian Institute of Technology, Indore-453552, India |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | The underlying mechanisms responsible for the fast gamma-ray variability in Blazars and the intriguing process of particle acceleration in magnetized relativistic jets are still unclear. To address these pressing questions, Blazars emerge as the ideal laboratories to study because: (a) their relativistic jets are oriented very close to our line of sight, and (b) they show gamma-ray variability in the scale of days to minutes. The broad electromagnetic spectrum and diversity of these objects can be explained by a variety of models including shock acceleration, star-in-jet model, two-zone emission and mini jet-in-jet interaction from magnetic reconnection. However, observed extremely fast variability poses a constraint on the available shock model. Magnetic reconnection formed from plasmoids filled with relativistic particles and magnetic fields can explain extremely fast variability and help ease the limitations faced by shock acceleration. Motivated by the mostly unknown plasma composition of AGN jets, we conducted three-dimensional resistive relativistic magnetohydrodynamics (RRMHD) simulations using the PLUTO code to investigate the reconnection in the unexplored regime of electron-positron-proton (pair-proton) plasmas column. These reconnection events are mainly driven by the turbulence induced by current-driven kink instability along the relativistic jets. In this presentation, I shall describe the novel technique of identifying the current sheets that are responsible for fast magnetic reconnection and plasmoid formation in our simulational data. Additionally, I shall discuss detailed statistical analysis focusing on the distribution of their geometric properties, including length, width, and thickness, as these factors can significantly impact particle acceleration sites and the observed fast variability. The initial results suggest that the filamentary current sheets produced due to turbulent reconnection in relativistic jets can play a vital role in producing such observed high-energy variability in Blazars. |
