The metallic winds in dwarf galaxies

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.

13 pages, 7 figures, accepted for publication in ApJ

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• The physics of gas phase metallicity gradients in galaxies
• Chemical and stellar properties of star-forming dwarf galaxies
• High-resolution three-dimensional simulations of gas removal from ultrafaint dwarf galaxies. I. Stellar feedback
• A Model for Clumpy Self-Enrichment in Globular Clusters
• The impact of carbon and oxygen abundances on the metal-poor initial mass function
• Denuded Dwarfs Demystified: Gas Loss from dSph Progenitors and Implications for the Minimum Mass of Galaxies
• A ring-shaped starburst as a galactic wind-generating mechanism: Morphology, emission, and mass ejection