| Name: | Ritik Sharma |
| Affiliation: | IIT Bhilai |
| Conference ID : | ASI2024_453 |
| Title : | Two phases of accretion and the emergence of supermassive black holes at cosmic dawn |
| Authors : | Ritik Sharma*, Mahavir Sharma* |
| Authors Affiliation: | * Indian Institute of Technology (IIT) Bhilai, 491001 , India |
| Mode of Presentation: | Poster |
| Abstract Category : | Galaxies and Cosmology |
| Abstract : | The existence of supermassive black holes at redshifts greater than 6 poses a challenge to the
traditional models of black hole growth through Eddington limited accretion. We investigate the steady spherically symmetric accretion onto a black hole at the centre of a dark matter halo. For the halo we consider a Hernquist and an NFW profile, and derive trans-sonic flow solutions in the combined potential of a hole and a halo. Our results indicate two phases of accretion. The first is an initial phase with a low accretion rate where the mass accretion rate is set by the black hole. The second is a phase of rapid accretion where the halo dominates the mass accretion rate. We also set-up a simulation with the Eulerian code PLUTO to study the time-dependence of mass accretion. We further generalize our results for a polytropic case. Our findings suggest that only isothermal flow is likely for realistic halo and flow parameters. Our results on the evolution of black hole mass and Eddington ratio agree with the properties of massive black holes detected by the JWST at cosmic dawn.
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