Advanced search
Start date
Betweenand

Gas removal in the Ursa minor galaxy: linking hydrodynamics and chemical evolution models

Grant number: 17/03173-4
Support type:Regular Research Grants - Publications - Scientific article
Duration: April 01, 2017 - September 30, 2017
Field of knowledge:Physical Sciences and Mathematics - Astronomy
Principal Investigator:Anderson Caproni
Grantee:Anderson Caproni
Home Institution: Pró-Reitoria de Pós-Graduação e Pesquisa. Universidade Cruzeiro do Sul (UNICSUL). São Paulo , SP, Brazil
Associated research grant:14/11156-4 - What drives the stellar mass growth of Early-Type galaxies? Born or made: the saga continues, AP.TEM

Abstract

We present results from a non-cosmological, three-dimensional hydrodynamical simulation of the gas in the dwarf spheroidal galaxy Ursa Minor. Assuming an initial baryonic-to-dark-matter ratio derived from the cosmic microwave background radiation, we evolved the galactic gas distribution over 3 Gyr, taking into account the effects of the types Ia and II supernovae. For the first time in the literature, we used in our simulation the instantaneous supernovae rates derived from a chemical evolution model applied to spectroscopic observational data of Ursa Minor. We show that the amount of gas which is lost in this process is variable with time and radius, being the highest rates observed during the initial 600 Myr in our simulation. Our results indicate that types Ia and II supernovae must be essential drivers of the gas loss in Ursa Minor galaxy (and probably in other similar dwarf galaxies), but it is ultimately the combination of galactic winds powered by these supernovae and environmental effects (e.g., ram pressure stripping) that results in the complete removal of the gas content. (AU)