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Intermediate-Mass Black Hole Feedback in Dwarf Galaxies: a View from Cosmological Simulations

Published online by Cambridge University Press:  07 April 2020

Paramita Barai  and
Elisabete M. de Gouveia Dal Pino
Paramita Barai
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas - Universidade de São Paulo (IAG-USP), Rua do Matão 1226, São Paulo, 05508-090, Brasil email: [email protected]
Elisabete M. de Gouveia Dal Pino
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas - Universidade de São Paulo (IAG-USP), Rua do Matão 1226, São Paulo, 05508-090, Brasil email: [email protected]
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Abstract

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Black holes are usually observed to be of stellar-mass or supermassive. By natural extension, there should be a population of Intermediate-Mass Black Holes (IMBHs: with mass between 100 to 106M⊙) in the Universe; which has started to been observed. An exciting claim has been made recently by Silk (2017): that early feedback by IMBHs in gas-rich dwarf galaxies at z = 5–8, can potentially solve multiple dwarf galaxy problems within the Λ-cold-dark-matter cosmology. We are performing Cosmological Hydrodynamical Simulations of (2Mpc)3 volumes, starting from z = 100, to test the case for IMBHs in Dwarf Galaxies. Black holes of mass 1000M⊙ are seeded inside halos when they reach a mass of 107M⊙. The black holes grow by accretion of gas from their surroundings and by merger with other black holes, and consequently eject feedback energy. We analyze the simulation output in post-processing to study the growth of the first IMBHs, and their impact on star-formation. Our conclusions, based on numerical simulation results, support the phenomenological ideas made by Silk (2017). IMBHs at the centers of dwarf galaxies can be a strong source of feedback to quench star-formation and generate outflows. At the same time, these IMBHs form the missing link between stellar-mass and supermassive BHs.

Keywords

black hole physicshydrodynamicsmethods: numericalgalaxies: activegalaxies: dwarfgalaxies: evolutiongalaxies: high-redshift(cosmology:) large-scale structure of universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S342: Perseus in Sicily: From Black Hole to Cluster Outskirts , May 2018 , pp. 154 - 157
Copyright
© International Astronomical Union 2020

References

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