Environmental dependence of star formation induced by cloud collisions in a barred galaxy
Environmental dependence of star formation induced by cloud collisions in a barred galaxy
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棒状星系中云碰撞引起的恒星形成的环境依赖性
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Habe
中科院分区：
文献类型：
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作者：
Y. Fujimoto;E. Tasker;A. Habe
云碰撞被认为是一种将小尺度星星形成过程与观测到的全球表面星星形成率和气体表面密度之间关系联系起来的方法。我们建议，这个模型可以进一步改进，允许这种碰撞的生产力取决于两个云的相对速度。我们的调整实现了一个简单的阶梯函数，导致最成功的碰撞是在所观察到的触发星星形成的速度。通过对棒星系的高分辨率模拟，我们成功地再现了棒星系中星星形成效率（SFE）低于旋臂的观测结果。当我们使用取决于云的内部湍流特性的效率时，这是不可能的。我们的研究结果表明，由云的引力驱动的高速碰撞是负责低酒吧SFE。
Cloud collision have been proposed as a way to link the small-scale star formation process with the observed global relation between the surface star formation rate and gas surface density. We suggest that this model can be improved further by allowing the productivity of such collisions to depend on the relative velocity of the two clouds. Our adjustment implements a simple step function that results in the most successful collisions being at the observed velocities for triggered star formation. By applying this to a high resolution simulation of a barred galaxy, we successfully reproduce the observational result that the star formation efficiency (SFE) in the bar is lower than that in the spiral arms. This is not possible when we use an efficiency dependent on the internal turbulence properties of the clouds. Our results suggest that high velocity collisions driven by the gravitational pull of the clouds are responsible for the low bar SFE.
剪切力在银河系恒星形成中的较小作用：来自银河系环调查的见解
DOI：
10.1088/0004-637x/758/2/125
发表时间：
2012
期刊：
The Astrophysical Journal
影响因子：
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作者：
Dib S
通讯作者：
Dib S