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Radiation hydrodynamics simulations of gas removal in dwarf galaxies

Grant number: 18/03374-2
Support type:Research Grants - Visiting Researcher Grant - International
Duration: September 01, 2018 - October 31, 2018
Field of knowledge:Physical Sciences and Mathematics - Astronomy
Cooperation 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
Home 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.TEM

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)

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