解开星系团演化的动力学机制
Disentangling the Dynamical Mechanisms for Cluster Galaxy Evolution
摘要：
在中等红移和局域宇宙之间的富星系团环境中，大量晚型星系迅速转变为早期哈勃型星系的动力学原因，是我们理解星系形成和演化的一般问题的核心，一直是一个重要的未解决的问题。在这篇文章中，我们调查现有的建议机制的集群星系的转变，并讨论其相关性和局限性的解释形态BO效应。一个新的红外诊断方法的设计，以解开几个主要的物理机制的相对重要性，占BO效应，并给出了一个例子的第一个应用程序的一个单一的丰富的，中等红移的星系团，以证明这种方法的可行性。初步分析结果表明，相互作用增强的长期演化过程是星系团-星系形态转变的主要原因。这一结论也支持了广泛的其他已发表的结果，在这里组装，以突出其影响的形态BO效应的连贯的物理起源。
英文摘要：
The determination of the dynamical causes of the morphological Butcher-Oemler (BO) effect, or the rapid transformation of a large population of late-type galaxies to earlier Hubble types in the rich cluster environment between intermediate redshifts and the local universe, has been an important unsolved problem which is central to our understanding of the general problems of galaxy formation and evolution. In this article, we survey the existing proposed mechanisms for cluster galaxy transformation, and discuss their relevance and limitations to the explanation of the morphological BO effect. A new infrared diagnostic approach is devised to disentangle the relative importance of several major physical mechanisms to account for the BO effect, and an example of the first application of this procedure to a single rich, intermediate redshift galaxy cluster is given to demonstrate the viability of this approach. The preliminary result of this analysis favors the interaction-enhanced secular evolution process as the major cause of the cluster-galaxy morphological transformation. This conclusion is also supported by a wide range of other published results which are assembled here to highlight their implications on a coherent physical origin for the morphological BO effect.
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