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arXiv 0901.1090astro-ph.GA
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解析星系的恒星形成历史

Star formation histories of resolved galaxies

Monica Tosi

摘要:

分辨出的恒星星族色星等图是研究主星系区恒星形成历史的最好工具。在这篇综述中,简要概述了通过合成色星等图导出恒星形成历史的方法,并总结了其应用于各种形态类型的分辨星系的结果。它表明,所有的星系研究到目前为止已经形成的恒星在回望的时间达到的观测数据,独立的形态类型和金属丰度。早期型星系主要在最早的时期形成了恒星,但在某些情况下并不完全如此。所有其他星系似乎都经历了相当连续的恒星形成活动,尽管有显着的速率变化,有时是短暂的静止阶段。

英文摘要:

The colour-magnitude diagrams of resolved stellar populations are the best tool to study the star formation histories of the host galactic regions. In this review the method to derive star formation histories by means of synthetic colour-magnitude diagrams is briefly outlined, and the results of its application to resolved galaxies of various morphological types are summarized. It is shown that all the galaxies studied so far were already forming stars at the lookback time reached by the observational data, independently of morphological type and metallicity. Early-type galaxies have formed stars predominantly, but in several cases not exclusively, at the earliest epochs. All the other galaxies appear to have experienced rather continuous star formation activities throughout their lifetimes, although with significant rate variations and, sometimes, short quiescent phases.

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