Radiation hydrodynamics simulations of gas removal in dwarf galaxies

• Grant number: 18/03374-2
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• Start date: September 01, 2018
• End date: October 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Agreement: CONFAP ; Newton Fund, with FAPESP as a partner institution in Brazil ; UK Academies
• Principal Investigator: Diego Antonio Falceta Gonçalves
• Grantee: Diego Antonio Falceta Gonçalves
• Visiting researcher: Bert Vandenbroucke
• Visiting researcher institution: University of St Andrews, Scotland
• Host Institution: Escola de Artes, Ciências e Humanidades (EACH). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 13/10559-5 - Investigation of high energy and plasma astrophysics phenomena: theory, numerical simulations, observations, and instrument development for the Cherenkov Telescope Array (CTA), AP.ESP

Abstract

The standard lambdaCDM model of cosmology successfully reproduces the distribution of massive galaxies and clusters in the observable Universe, However, when applied to low mass galaxies, the model consistently overpredicts the number of low mass galaxy haloes that is observed in the Local Group. Previous efforts at modelling dwarf galaxies have focussed on the refinement of energetic stellar feedback models to explain the absense of gas in these objects. However, the effects of radiation on the gas dynamics has not yet been properly discussed, mostly given its technical difficulties. We propose to improve our understanding of the formation of low mass isolated dwarf galaxies by including an accurate, on-the-fly treatment of photoionisation that properly takes into account the propagation and geometrical shielding of photoionising radiation, both from internal young stellar objects and an external UV background field. Our goal is to compare the effects of radiation on the energy budget of baryonic mass around low-mass galaxy haloes of the early Universe. (AU)