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arXiv 1003.0798astro-ph.COastro-ph.GA
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球状星团的质量函数是暴生的残余

The Globular Cluster Mass Function as a Remnant of Violent Birth

Bruce G. Elmegreen

摘要:

贫金属晕球状星团的质量函数的对数正态形状被认为是由于在红移z~5-15的盘状星系的稠密环境中,初始的M^{-2}幂律被蒸发、与云的碰撞以及星团间的相互作用迅速修正的结果.星系相互作用随后将这些星系团喷射到星系群环境中,在那里它们落入其他成长中的星系并填充它们的晕。在z~2-5星系中稍后形成的星团,以及那些在主要合并过程中形成的星团,产生富含金属的球状星团。不断发展的集群人口的蒙特卡罗模型表明,在高红移星系的典型条件下,早期形成的对数正态质量函数。

英文摘要:

The log-normal shape of the mass function for metal-poor halo globular clusters is proposed to result from an initial M^{-2} power law modified rapidly by evaporation, collisions with clouds, and mutual cluster interactions in the dense environment of a redshift z~5-15 disk galaxy. Galaxy interactions subsequently spray these clusters into the galaxy group environment, where they fall into other growing galaxies and populate their halos. Clusters forming later in z~2-5 galaxies, and those formed during major mergers, produce metal-rich globulars. Monte Carlo models of evolving cluster populations demonstrate the early formation of a log-normal mass function for typical conditions in high-redshift galaxies.

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