| Full text | |
| Author(s): |
Caproni, Anderson
;
Lanfranchi, Gustavo A.
;
Friaca, Amancio C. S.
;
Soares, Jennifer F.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | ASTROPHYSICAL JOURNAL; v. 944, n. 1, p. 9-pg., 2023-02-01. |
| Abstract | |
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) | |
| FAPESP's process: | 19/21615-0 - Effects of supernovae explosions on the gas dynamics in Dwarf Spheroidal Galaxies |
| Grantee: | Jennifer Ferreira Soares |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 17/25651-5 - Numerical studies of extragalactic objects in the local universe and at high redshifts |
| Grantee: | Anderson Caproni |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center |
| Grantee: | Elisabete Maria de Gouveia Dal Pino |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 14/11156-4 - What drives the stellar mass growth of Early-Type galaxies? Born or made: the saga continues |
| Grantee: | Reinaldo Ramos de Carvalho |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 17/25799-2 - Local Dwarf Galaxies: Internal Dynamics and Chemical Enrichment |
| Grantee: | Gustavo Amaral Lanfranchi |
| Support Opportunities: | Regular Research Grants |