Speaker
Nicolas Guillard
(ESO)
Description
Observations of dwarfs galaxies suggest that Black Holes (BHs) and Nuclear Clusters (NCs) are co-evolving with their hosts. However, their formation and how they are fueled is still unclear. NCs, unlike BHs, may provide a visible record of the accretion of stars and gas. Therefore, they can be used as probes for the gas and star fueling of the nuclei of dwarfs galaxies.
Whether NCs form via accretion of multiple clusters or in-situ star formation, the mass build-up in such regions ultimately depends on both pc-scale (e.g turbulence, physics of the ISM) and kpc-scale (e.g spirals, bars). Thus, one needs to understand these scaling coupling in order to properly address the physical processes involved in NCs formation. The associated physical processes have so far been studied numerically at resolution from 100 to 50pc, mostly focusing on the role of bars. The main nuclear structures (e.g., the nuclear disks at the 10-50 pc scale) thus remain unresolved and the fueling processes unclear.
From the analysis of simulations of a dwarf galaxy at parsec resolution, the aim of my project is to study the coupling effects between large scale (~30kpc) and small scale (~pc). I will focus on the fueling mechanisms and the formation of nuclear star clusters and emphasise the impact of star formation and stellar driven feedback.
Author
Nicolas Guillard
(ESO)