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Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme

Kawata, D; Gibson, BK; Barnes, DJ; Grand, RJJ; Rahimi, A; (2014) Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme. Monthly Notices of the Royal Astronomical Society , 438 (2) 1208- 1222. 10.1093/mnras/stt2267. Green open access

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Abstract

To study the star formation and feedback mechanism, we simulate the evolution of an isolated dwarf irregular galaxy (dIrr) in a fixed dark matter halo, similar in size to WLM. We use the new version of our original N-body/smoothed particle chemodynamics code, GCD+, which adopts improved hydrodynamics, metal diffusion between the gas particles and new modelling of star formation and stellar wind and supernovae (SNe) feedback. Comparing the simulations with and without stellar feedback effects, we demonstrate that the collisions of bubbles produced by strong feedback can induce star formation in a more widely spread area. We also demonstrate that the metallicity in star forming regions is kept low due to the mixing of the metal-rich bubbles and the metal-poor inter-stellar medium. Our simulations also suggest that the bubble-induced star formation leads to many counter-rotating stars. The bubble-induced star formation could be a dominant mechanism to maintain star formation in dIrrs, which is different from larger spiral galaxies where the non-axisymmetric structures, such as spiral arms, are a main driver of star formation.

Type: Article
Title: Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stt2267
Publisher version: http://dx.doi.org/10.1093/mnras/stt2267
Language: English
Additional information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1399193
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