高红移星系团中形成恒星的巨星系团的生存
Survival of Star-Forming Giant Clumps in High-Redshift Galaxies
摘要：
我们研究了在星系形成的最活跃阶段，来自恒星的辐射压力对高红移大质量盘状星系中恒星形成巨块生存的影响。这些团块通常质量约为10^8-10^9兆太阳能，半径约为0.5 ~ 1，它们是由剧烈的引力不稳定性在湍流的富气盘中形成的，然后在约10个动力学时间内迁移到中心隆起。我们表明，这些团块的生存或破坏恒星反馈的影响下，关键取决于它们形成恒星的速度。如果它们在每个自由落体时间内将其气体质量的百分之几转化为恒星，就像所有局部恒星形成系统所观察到的那样，并由肯尼库特-施密特定律所暗示，它们就不会被破坏。只有当团块在几次自由落体中将大部分质量转化为恒星时，反馈才能产生显著的气体排出。我们考虑这种快速的恒星形成是否可能在高红移巨星团。
英文摘要：
We investigate the effects of radiation pressure from stars on the survival of the star-forming giant clumps in high-redshift massive disc galaxies, during the most active phase of galaxy formation. The clumps, typically of mass ~10^8-10^9 Msun and radius ~0.5-1, are formed in the turbulent gas-rich discs by violent gravitational instability and then migrate into a central bulge in ~10 dynamical times. We show that the survival or disruption of these clumps under the influence of stellar feedback depends critically on the rate at which they form stars. If they convert a few percent of their gas mass to stars per free-fall time, as observed for all local star-forming systems and implied by the Kennicutt-Schmidt law, they cannot be disrupted. Only if clumps convert most of their mass to stars in a few free-fall times can feedback produce significant gas expulsion. We consider whether such rapid star formation is likely in high-redshift giant clumps.
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