Old Stellar Populations in Galaxies

本次调查将研究形成和早期演化 特别关注这些过程是如何 受到环境的影响。 这将通过观察 早期星系和我们星系中的古老恒星群 银河 这位研究人员最近的研究表明星星 致密星系团中早型星系的形成被截断 丹 这项工作将大大扩展到确认或修改 这个结果。 此外，他最近发现，近一半的 在附近的早期类型的星系，动态年轻的飞马座， sus I星团显示出最近星星形成的明显迹象， 跟踪以确定该结果是否与其他 工作人员观察到了一个类似的效果， 集群 最后，这些观察的结果将 应用到我们银河系的例子中， 它的崩溃和早期化学演化

This investigation will study the formation and early evolution of galaxies with particular attention paid to how these processes are affected by the environment. This will be done by observing old stellar populations in early type galaxies and in our own galaxy. Recent work by this investigator has suggested that star formation is truncated in early type galaxies in dense cluster cores. This work will be greatly extended to confirm or modify this result. In addition, his recent discovery that nearly half of the early type galaxies in the nearby, dynamically young Pega- sus I cluster show clear signs of recent star formation will be followed up to determine if this result can be related to other workers observations of a similar effect much more distant galaxy clusters. Finally, the results of these observations will be applied to the case of our own galaxy, in trying to understand its collapse and early chemical evolution.