| Name: Avijit Chowdhury |
| Affiliation: IIT Guwahati |
| Conference ID: ASI2026_459 |
| Title: Effect of dark matter halo on transonic accretion onto galactic black holes |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Avijit Chowdhury(IIT Guwahati), Gargi Sen(IIT Guwahati), Sayan Chakrabarti(IIT Guwahati), Santabrata Das(IIT Guwahati) |
| Abstract: The environment surrounding a black hole or black hole binaries is generally expected to play an essential role in understanding various astrophysical phenomena around them. In this study, we investigate relativistic, low angular momentum, inviscid, and advective hot accretion flow onto a galactic supermassive black hole dressed with a cold dark matter halo. Focusing on different relativistic dark matter distributions with an inner density spike, we analyze the effect of the dark matter halo on the topology and properties of the accretion flow. Our results show enhancement of disk luminosity in the presence of dark matter, which depends on the nature and properties (halo mass and compactness) of the dark matter distribution. Since the dominant contribution to the disk luminosity for compact and massive halo comes from the inner region of the accretion disk, our analysis hints that luminosity measurement can indeed be useful to probe the exact nature of the dark matter density spike. We further comment on how a small but finite viscosity is expected to modify the flow structure and luminosity, without qualitatively altering our main conclusions. |
