Boundary Conditions in Hydrodynamic Simulations of Isolated Galaxies and Their Impact on the Gas-loss Processes

Autor(es)

Caproni, Anderson ; Lanfranchi, Gustavo A. ; Friaca, Amancio C. S. ; Soares, Jennifer F.

• Tipo de documento: Artigo Científico
• Fonte: ASTROPHYSICAL JOURNAL; v. 944, n. 1, p. 9-pg., 2023-02-01.

Resumo

Three-dimensional hydrodynamic simulations are commonly used to study the evolution of the gaseous content in isolated galaxies, besides its connection with galactic star formation histories. Stellar winds, supernova blasts, and black hole feedback are mechanisms usually invoked to drive galactic outflows and decrease the initial galactic gas reservoir. However, any simulation imposes the need of choosing the limits of the simulated volume, which depends, for instance, on the size of the galaxy and the required numerical resolution, besides the available computational capability to perform it. In this work, we discuss the effects of boundary conditions on the evolution of the gas fraction in a small-sized galaxy (tidal radius of similar to 1 kpc), like classical spheroidal galaxies in the Local Group. We found that open boundaries with sizes smaller than approximately 10 times the characteristic radius of the galactic dark-matter halo become unappropriated for this kind of simulation after similar to 0.6 Gyr of evolution, since they act as an infinity reservoir of gas due to dark-matter gravity. We also tested two different boundary conditions that avoid gas accretion from numerical frontiers: closed and selective boundary conditions. Our results indicate that the later condition (that uses a velocity threshold criterion to open or close frontiers) is preferable since it minimizes the number of reversed shocks due to closed boundaries. Although the strategy of putting computational frontiers as far as possible from the galaxy itself is always desirable, simulations with a selective boundary condition can lead to similar results at lower computational costs. (AU)

• Processo FAPESP: 19/21615-0 - Efeitos das explosões de supernovas na dinâmica do gás em Galáxias Esferoidais Anãs
• Beneficiário: Jennifer Ferreira Soares
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 17/25651-5 - Estudos numéricos de objetos extragalácticos no universo local e em altos redshifts
• Beneficiário: Anderson Caproni
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL
• Beneficiário: Elisabete Maria de Gouveia Dal Pino
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 22/16883-8 - Condições de fronteira em simulações hidrodinâmicas de galáxias isoladas e seu impacto no processo de perda de gás
• Beneficiário: Anderson Caproni
• Modalidade de apoio: Auxílio à Pesquisa - Publicações científicas - Artigo
• Processo FAPESP: 14/11156-4 - O que determina o crescimento da massa estelar de galáxias elípticas? Intrínseco ou ambiente: a saga contínua
• Beneficiário: Reinaldo Ramos de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/25799-2 - Galáxias Anãs Locais: Dinâmica Interna e Enriquecimento Químico
• Beneficiário: Gustavo Amaral Lanfranchi
• Modalidade de apoio: Auxílio à Pesquisa - Regular