人口II在哪里？
Where is Population II?
摘要：
用罗马数字表示恒星星族代表了一种对星系形成的分类方法，这种方法现在已经远远落后于我们了。尽管如此，原始世代恒星的概念，接着是原星系时代，最后是主流恒星星族，是检验我们对早期恒星形成的物理理解的一个合理起点。在未来十年中，这将是前所未有的观测驱动。本文对星族II星理想的同时代均匀分布进行了观测检验。我们研究类星体、球状星团和星系际介质的积分自由电子密度的空间分布，以检验均匀性假设。任何$real$不均一性意味着群体II不是同时期的。
英文摘要：
The use of roman numerals for stellar populations represents a classification approach to galaxy formation which is now well behind us. Nevertheless, the concept of a pristine generation of stars, followed by a protogalactic era, and finally the mainstream stellar population is a plausible starting point for testing our physical understanding of early star formation. This will be observationally driven as never before in the coming decade. In this paper, we search out observational tests of an idealized coeval and homogeneous distribution of population II stars. We examine the spatial distribution of quasars, globular clusters, and the integrated free electron density of the intergalactic medium, in order to test the assumption of homogeneity. Any $real$ inhomogeneity implies a population II that is not coeval.
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