Local Dwarf Galaxies: Internal Dynamics and Chemical Enrichment

• Grant number: 17/25799-2
• Support Opportunities: Regular Research Grants
• Duration: April 01, 2018 - March 31, 2020
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Principal Investigator: Gustavo Amaral Lanfranchi
• Grantee: Gustavo Amaral Lanfranchi
• Host Institution: Pró-Reitoria de Pós-Graduação e Pesquisa. Universidade Cruzeiro do Sul (UNICSUL). São Paulo , SP, Brazil

Abstract

Dwarf galaxies are key objects in the context of galactic evolution due to their proximity and their particular features. The dwarf spheroidal galaxies, for instance, are totally depleted of neutral gas and are characterized by particular abundance ratios patterns, both not yet fully explained. The removal of its gas content could be due to internal (stellar feedback, outflow from a central black hole) or external (ram-pressure, tidal stripping) mechanims or yet a combination of the two, whereas the observed abundance ratios pattern seems to depende strongly on the gas loss. The main goal of this project is the analysis of the chemical evolution and internal gas dynamics of local dwarf galaxies by means of a detailed chemical evolution model (developed by the author with the group of the University of Trieste) and an 3D hydrodynamical simulation code. Besides that, the cross-entropy statistical method will be adopted in the comparisons between the data and models results. The comparison between models results and observed data (abundance ratios, stellar metallicity distribution, age-metallicity relation, gas mass, total mass) will allow one to shed some light not only in the nucleossynthesis of chemical elements and in the chemical enrichment of the medium, but also in the processes of formation and evolution of galaxies. By putting together the results of these two analysis (chemical and hydrodinamical evolution) it will be possible to impose strong constraints in a consistent and coherent scenario for the formation and evolution of local galaxies, especially the dwarf spheroidal ones, but also for other morphological types such as irregular dwarfs, ultra faint dwarfs, and ellipticals. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

AGUADO, DAVID S.; MYEONG, G. C.; BELOKUROV, VASILY; EVANS, N. WYN; KOPOSOV, SERGEY E.; ALLENDE PRIETO, CARLOS; LANFRANCHI, GUSTAVO A.; MATTEUCCI, FRANCESCA; SHETRONE, MATTHEW; SBORDONE, LUCA; et al. The S2 stream: the shreds of a primitive dwarf galaxy. Monthly Notices of the Royal Astronomical Society, v. 500, n. 1, p. 889-910, JAN 2021. (17/25799-2, 14/11156-4)

CAPRONI, ANDERSON; LANFRANCHI, GUSTAVO A.; FRIACA, AMANCIO C. S.; SOARES, JENNIFER F.. Boundary Conditions in Hydrodynamic Simulations of Isolated Galaxies and Their Impact on the Gas-loss Processes. ASTROPHYSICAL JOURNAL, v. 944, n. 1, p. 9-pg., 2023-02-01. (19/21615-0, 17/25651-5, 09/54006-4, 14/11156-4, 17/25799-2)