期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 438, 期 2, 页码 1208-1222出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt2267
关键词
hydrodynamics; ISM: bubbles; galaxies: dwarf
资金
- UK's Science & Technology Facilities Council (STFC) [ST/J001341/1]
- STFC
- Large Facilities Capital Fund of BIS
- PRACE
- STFC [ST/H008586/1, ST/I506053/1, ST/J001341/1, ST/F007019/1, ST/H00260X/1, ST/J005673/1, ST/K00333X/1, ST/K000977/1, ST/K000373/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H00260X/1, ST/I506053/1, ST/J001341/1, ST/H008586/1, ST/F007019/1, ST/K00333X/1, ST/K000373/1, ST/J005673/1] Funding Source: researchfish
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 Wolf-Lundmark-Melotte, using a new stellar feedback scheme. 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 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 interstellar 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.
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