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

References in corpus (7)

• The recycling of gas and metals in galaxy formation: predictions of a dynamical feedback model
• Elemental Abundances in Milky Way-like Galaxies from a Hierarchical Galaxy Formation Model
• Effects of the galactic winds on the stellar metallicity distribution of dwarf spheroidal galaxies
• The effect of differential galactic winds on the chemical evolution of galaxies
• HST/STIS spectroscopy of the environment in the starburst core of M82
• A new superwind galaxy: XMM-Newton observations of NGC 6810
• Metal distribution in the ICM - a comprehensive numerical study of twelve galaxy clusters