• Role of primordial black holes in the direct collapse scenario of supermassive black hole formation at high redshifts

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      https://www.ias.ac.in/article/fulltext/joaa/039/01/0009

    • Keywords

       

      Cosmology: theory—cosmology: dark ages—reionization—first stars—quasars: supermassive black holes.

    • Abstract

       

      In this paper, we explore the possibility of accreting primordial black holes as the source of heating for the collapsing gas in the context of the direct collapse black hole scenario for the formation of super-massive black holes (SMBHs) at high redshifts, $z \sim 6–7$. One of the essential requirements for the direct collapse model to work is to maintain the temperature of the in-falling gas at $\approx$104 K. We show that even under the existingabundance limits, the primordial black holes of masses $\gtrsim$10−2M$_{\odot}$, can heat the collapsing gas to an extent that the H$_2$ formation is inhibited. The collapsing gas can maintain its temperature at 104 K till the gas reachesa critical density $n_c \approx 10^3$ cm$^{−3}$, at which the roto-vibrational states of H$_2$ approaches local thermodynamicequilibrium and H$_2$ cooling becomes inefficient. In the absence of H$_2$ cooling, the temperature of the collapsing gas stays at $\approx$10$^4$ Keven as it collapses further. We discuss scenarios of subsequent angular momentum removaland the route to find collapse through either a supermassive star or a supermassive disk.

    • Author Affiliations

       

      KANHAIYA L. PANDEY1 A. MANGALAM1

      1. Indian Institute of Astrophysics, Bangalore 560 034, India.
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