| Name: Gargi Sen |
| Affiliation: Indian Institute of Technology Guwahti |
| Conference ID: ASI2026_944 |
| Title: GRMHD accretion flow around Sagittarius A ∗ in light of EHT observations |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Gargi Sen(Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India), Debaprasad Maity(Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India), Santabrata Das(Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India) |
| Abstract: We explore steady state, low angular momentum advective accretion flows around a Kerr black hole within the framework of general relativistic magnetohydrodynamics (GRMHD). By solving the full set of GRMHD equations in steady state, our goal is to develop a detailed understanding of how magnetized plasma behaves in the strong gravity regime near a spinning black hole. We compute the accretion solutions using a set of constant input parameters, including the specific energy ($\mathcal{E}$), angular momentum ($\mathcal{L}$), magnetic flux ($\Phi$), and the isorotation parameter ($I$). By systematically varying these parameters, we generate a family of global GRMHD accretion solutions that describe the nature of the plasma around the black hole. Using this framework, we examine whether the magnetic field strengths inferred by the Event Horizon Telescope (EHT) for Sagittarius A$^*$ at different radii can be reproduced. Our results show that, over a wide range of parameters, the model can reproduce the magnetic field strengths reported by the EHT with an accuracy of about $10\%$, which establishes a self-consistent framework for understanding accretion processes near the event horizon. The results presented here are adapted from our original paper:\href{https://journals.aps.org/prd/abstract/10.1103/v8mp-hks1}{\textcolor{blue}{\textbf{Phys. Rev. D 112, 083047 (2025)}}} |
