Abstract Details

Name: Indu Kalpa Dihingia
Affiliation: IIT Indore
Conference ID: ASI2021_406
Title : Jets, disk winds and oscillations in general relativistic magnetically driven flows from thin accretion disc
Authors and Co-Authors : Indu Kalpa Dihingia (Indian Institute of Technology Indore, Indore, India), Bhargav Vaidya (Indian Institute of Technology Indore, Indore, India), Christian Fendt (MPIA - Heidelberg, Heidelberg, Germany)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : Relativistic jets and disc-winds are often observed from many BH-XRBs, and AGNs. However, the theoretical understanding of jet launching and driving of disc-wind from underlying accretion disc is still minimal. In this study, we try to understand the role of the magnetic field and its structure in launching jet and disc-wind. Subsequently, we explore the possible connection between jet, wind, and the accretion disc around the central black hole. To do that, we study GRMHD accretion flow in 2.5D using AMR numerical setup. We supply a steady-thin accretion disc as our initial condition for the simulation. We perform an extensive parametric study by choosing different combinations of plasma-$\beta$ parameter and the poloidal magnetic field's inclination parameter ($m$). Our study finds relativistic jets driven by the Blandford \& Znajek (BZ) mechanism, and the disc-wind driven by the Blandford \& Payne (BP) mechanism. We also find that due to the poloidal field lines' reconnection events, plasmoids are formed, and these plasmoids advect with disc-winds. As a result, the tension force due to the poloidal magnetic field is enhanced in the inner part of the accretion disc, resulting in disc truncation and oscillation. These oscillations are responsible for flaring activities in the jet. We find simulation runs with a lower value of the plasma-$\beta$, and lower inclination angle parameter ($m$) are more prone to the formation of plasmoids and inner disc oscillation. Our models provide a possible template to understand transition phenomena in BH-XRBs.