Galactic outflows and the chemical evolution of dwarf galaxies

TL;DR

This paper investigates how galactic winds driven by supernovae and stellar winds influence the chemical evolution of dwarf galaxies, focusing on superbubble evolution, multi-phase ISM effects, and galaxy shape impacts.

Contribution

It explores the late evolution of superbubbles, the impact of multi-phase ISM on galactic winds, and the influence of galaxy flattening on wind development, offering new insights into dwarf galaxy evolution.

Findings

Superbubbles can evolve to different final states depending on galaxy parameters.

Multi-phase ISM significantly affects the development and morphology of galactic winds.

Galaxy flattening promotes bipolar wind formation, influencing metal distribution.

Abstract

Galactic winds in dwarf galaxies are driven by the energy released by supernova explosions and stellar winds following an intense episode of star formation, which create an over-pressured cavity of hot gas. Although the luminosity of the star formation episode and the mass of the galaxy play a key role in determining the occurrence of the galactic winds and the fate of the freshly produced metals, other parameters play an equally important role. In this contribution we address the following questions (i) What is the late evolution of superbubbles and what is the final fate of the superbubble cavities? (ii) How does the multi-phase nature of the ISM, in particular the coexistence of hot gas with embedded clouds, affect the development of galactic winds? (iii) What is the relation between the flattening of a galaxy and the development of bipolar galactic winds?