AR 14582 (Archival Research)

Sat Jul 20 09:44:59 GMT 2024

Principal Investigator: Laura Sales
PI Institution: University of California - Riverside
Investigators (xml)

Title: Black Holes in Dwarf Galaxies: Growth and Impact
Cycle: 24

Recent observations have confirmed the presence of massive black holes (BHs) populating the centers of some dwarf galaxies. It is unclear how these BHs could assemble in such hosts --where most of the stars are born in-situ without significant contributions from mergers. HST observations of dwarf galaxies have also revealed an extraordinary diversity in their star-formation histories. We propose to use cosmological hydrodynamical simulations to study the assembly of BHs in low mass galaxies and evaluate their associated feedback effects. We will simulate a set of 10 dwarf halos with the AREPO code using several models for stellar and BH feedback. We will explore the link between the final BH mass and the evolutionary history in dwarfs. By comparing runs with/without BHs we will assess the effects of BH feedback on the star-formation histories of the dwarfs and also on their observed final properties, such as radial gradients in stellar age, color and metallicity. Moreover, if BH feedback can couple efficiently to the ISM, it might help transforming the inner dark matter density profile from cusps to cores. We will explore this possibility in our runs using both: 3D information from gas and stars but also creating mock line-of-sight velocity maps in order to gauge the observability of this effect in gas/stellar rotation curves. Our project not only addresses but also connects several recent and independent HST observations of dwarf galaxies, helping to build up a comprehensive understanding of how/when BHs can grow in dwarfs, and what are the smoking-gun signatures of BH feedback on the final properties of faint hosts.