The environment of "E+A" galaxies
The environment of "E+A" galaxies
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DOI：
10.1086/177495
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发表时间：
1995-12
期刊：
影响因子：
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通讯作者：
A. Zabludoff;D. Zaritsky;Huan Lin;D. Tucker;Yasuhiro Hashimoto;S. Shectman;A. Oemler;Robert P. Kirhner
中科院分区：
文献类型：
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作者：
A. Zabludoff;D. Zaritsky;Huan Lin;D. Tucker;Yasuhiro Hashimoto;S. Shectman;A. Oemler;Robert P. Kirhner
"E+ A“星系剧烈的星星形成历史以及它们几乎只在遥远的星系团中被发现，经常被用来将它们与"布彻-奥姆勒效应”联系起来，并认为星系团环境影响星系演化。从Las Campanas红移巡天的11113个光谱中，我们获得了21个邻近的“E+A”星系的独特样本。令人惊讶的是，这些“E+ A”中的很大一部分（约75%）位于该领域。因此，以ICM或集群潜力的形式与集群环境的相互作用对于"E+ A“的形成并不重要。如果有一种机制是造成"E+ A“的原因，那么它们在磁场中的存在以及21个中至少5个的潮汐特征表明，星系-星系相互作用和合并就是这种机制。这种相互作用最可能的环境是贫穷的群体，它们的速度分散度比星团低，星系密度比场高。在等级模型中，在中等红移时，比现在更多的群体会落入集群中。因此，Butcher-Oemler效应可能反映了星系在星系群和场中的典型演化，而不是星系团对星系中星星形成的影响。这份摘要有节略。
The violent star formation history of ``E+A'' galaxies and their detection almost exclusively in distant clusters is frequently used to link them to the ``Butcher-Oemler effect'' and to argue that cluster environment influences galaxy evolution. From 11113 spectra in the Las Campanas Redshift Survey, we have obtained a unique sample of 21 nearby ``E+A" galaxies. Surprisingly, a large fraction (about 75%) of these ``E+A''s lie in the field. Therefore, interactions with the cluster environment, in the form of the ICM or cluster potential, are not essential for ``E+A'' formation. If one mechanism is responsible for ``E+A''s, their existence in the field and the tidal features in at least 5 of the 21 argue that galaxy-galaxy interactions and mergers are that mechanism. The most likely environments for such interactions are poor groups, which have lower velocity dispersions than clusters and higher galaxy densities than the field. In hierarchical models, groups fall into clusters in greater numbers at intermediate redshifts than they do today. Thus, the Butcher-Oemler effect may reflect the typical evolution of galaxies in groups and in the field rather than the influence of clusters on star formation in galaxies. This abstract is abridged.