The metallic winds in dwarf galaxies

TL;DR

This study uses 3D simulations to explore how starbursts in dwarf galaxies drive metallic winds, revealing off-center starbursts as highly effective in metal loss.

Contribution

It introduces detailed 3D models of galactic winds driven by starbursts, highlighting the impact of starburst location and galaxy parameters on metal outflows.

Findings

Off-center starbursts cause significant metal loss.

Non-nuclear starbursts efficiently eject metals despite moderate mass loss.

Galactic wind characteristics depend on galaxy concentration and gas fraction.

Abstract

We present results from models of galactic winds driven by energy injected from nuclear (at the galactic center) and non-nuclear starbursts. The total energy of the starburst is provided by very massive young stellar clusters,which can push the galactic interstellar medium and produce an important outflow. Such outflow can be a well, or partially mixed wind, or a highly metallic wind. We have performed adiabatic 3D N-Body/Smooth Particle Hydrodynamics simulations of galactic winds using the GADGET-2 code. The numerical models cover a wide range of parameters, varying the galaxy concentration index, gas fraction of the galactic disk, and radial distance of the starburst. We show that an off-center starburst in dwarf galaxies is the most effective mechanism to produce a significant loss of metals (material from the starburst itself). At the same time a non-nuclear starburst produce a high efficiency of metal loss, in spite of having a moderate to low mass loss rate.