On the photodissociation of H2 by the first stars
On the photodissociation of H2 by the first stars
复制标题
关于第一批恒星对 H2 的光解离
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
P. Brand
中科院分区：
文献类型：
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作者：
S. Glover;P. Brand
宇宙中第一颗星星的形成预计将发生在小的原星系中，其中的气体被氢分子冷却。然而，如果大质量恒星在这些原星系中形成，它们可能会通过光解H2来抑制进一步的星星形成。我们研究的重要性，这种影响，通过估计的时间尺度上，显着的H2被破坏。我们发现，光解是显着的最小质量的原星系，但变得不那么原星系质量的增加。我们还研究了原星系内致密气体团的光解效应。我们发现，虽然坍缩在低密度的团块中会受到抑制，但密度更大的团块可能会存活下来形成恒星。
The first star formation in the Universe is expected to take place within small protogalaxies, in which the gas is cooled by molecular hydrogen. However, if massive stars form within these protogalaxies, they may suppress further star formation by photodissociating the H2. We examine the importance of this effect by estimating the time-scale on which significant H2 is destroyed. We show that photodissociation is significant in the least massive protogalaxies, but becomes less so as the protogalactic mass increases. We also examine the effects of photodissociation on dense clumps of gas within the protogalaxy. We find that while collapse will be inhibited in low-density clumps, denser ones may survive to form stars.