| Name: Ripon Sk |
| Affiliation: West Bengal State University |
| Conference ID: ASI2026_232 |
| Title: Multi-Transonic Accretion onto Black Holes in a Galactic Environment |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Ripon Sk(Department of Physics, West Bengal State University, Berunanpukhuria, West Bengal 700126), Sangita Chatterjee(School of Astrophysics, Presidency University, 86/1 College Street, Kolkata 700073, India.), Sankhasubhra Nag(Department of Physics, Ramakrishna Mission Vivekananda Centenary College, West Bengal 700118) |
| Abstract: We present a detailed hydrodynamic study of low-angular-momentum, axisymmetric, inviscid accretion onto a centrally located black hole, focusing on multi-transonic flow behaviour within the vertical equilibrium (VE) disc configuration. The analysis is performed using two distinct thermodynamic equations of state and a set of pseudo-Schwarzschild gravitational potentials to model the black hole spacetime. To construct a more physically realistic framework, we additionally include a multi-component galactic potential that captures the cumulative gravitational effects of the surrounding stellar population, dark matter halo, and diffuse hot gas.
A systematic comparison is carried out between accretion solutions influenced exclusively by the black hole potential and those evolving under the combined action of both black hole and galactic gravitational fields. Our investigation reveals that the presence of the galactic potential leads to appreciable alterations in the flow dynamics and thermodynamics, including shifts in the locations of critical points, changes in the transonic topology, and variations in shock-related flow properties. Furthermore, the galactic environment is found to leave a distinct imprint on the emergent acoustic geometry associated with the perturbed accretion flow.
These results highlight the crucial role of the host galaxy in shaping black hole accretion dynamics and emphasize that galactic-scale gravitational effects must be taken into account for accurate modeling of accretion processes in active galactic nuclei and other energetic astrophysical systems.
|
