Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme
Numerical simulations of bubble-induced star formation in dwarf irregular galaxies with a novel stellar feedback scheme
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使用新颖的恒星反馈方案对矮不规则星系中气泡诱导恒星形成进行数值模拟
DOI：
10.1093/mnras/stt2267
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发表时间：
2014
影响因子：
4.8
通讯作者：
Kawata D
中科院分区：
文献类型：
--
作者：
Kawata D
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 originalN-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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