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arXiv 1003.0011astro-ph.CO
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跨越宇宙历史的星系形成

Galaxy Formation Spanning Cosmic History

Andrew J. Benson, Richard G. Bower

摘要:

在过去的几十年里,星系形成理论取得了重大的成就。为了彻底检验现有的理论,我们需要对尚未探索的制度进行预测。为此,我们描述了一个新的实施Galform半解析模型的星系形成。我们的动机是Bower等人描述的模型在解释星系形成的许多方面的成功。尽管取得了这一成功,鲍尔等人的模型未能匹配一些观测约束,其物理实现的某些方面并不像我们希望的那样现实。本文中描述的模型包括了大量更新的物理学,考虑了过去十年来我们理解的发展,并删除了这个(和大多数其他)半分析模型所做的某些限制性假设。这使得它能够在高红移和低质量的情况下可靠地被利用。此外,我们已经进行了详尽的搜索模型参数空间,以找到一个特定的一组模型参数,产生的结果在很大范围内的观测数据(光度函数,星系的大小和动态,集群,颜色,金属含量)在广泛的红移。这个模型为在尚未探测的区域进行星系形成的计算提供了坚实的基础。

英文摘要:

Over the past several decades, galaxy formation theory has met with significant successes. In order to test current theories thoroughly we require predictions for as yet unprobed regimes. To this end, we describe a new implementation of the Galform semi-analytic model of galaxy formation. Our motivation is the success of the model described by Bower et al. in explaining many aspects of galaxy formation. Despite this success, the Bower et al. model fails to match some observational constraints and certain aspects of its physical implementation are not as realistic as we would like. The model described in this work includes substantially updated physics, taking into account developments in our understanding over the past decade, and removes certain limiting assumptions made by this (and most other) semi-analytic models. This allows it to be exploited reliably in high-redshift and low mass regimes. Furthermore, we have performed an exhaustive search of model parameter space to find a particular set of model parameters which produce results in good agreement with a wide range of observational data (luminosity functions, galaxy sizes and dynamics, clustering, colours, metal content) over a wide range of redshifts. This model represents a solid basis on which to perform calculations of galaxy formation in as yet unprobed regimes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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