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arXiv 1012.5959astro-ph.GA
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五个E+A(poststarburst)星系作为Brilliant Cluster Galerie

Five E+A (post-starburst) galaxies as Brightest Cluster Galaxies

Feng-Shan Liu, Zhong-Lue Wen, Jin-Lin Han, Xian-Min Meng

摘要:

布里渊星系团(BCGs)大多是椭圆星系,很少有突出的恒星形成。我们发现在8,812个BCGs中有5个是E+A(即后星爆)星系,它们的H $δ$ ~吸收线与$>2.5Å$宽度相等,而在[O II]和H $α$中没有明显的发射线。我们第一次从BCGs中发现的E+A特征并不像一般星系那样显著,这表明历史上的恒星形成并不是很激烈。

英文摘要:

Brightest Cluster Galaxies (BCGs) are mostly elliptical galaxies and very rarely have prominent star formation. We found that five out of 8,812 BCGs are E+A (i.e. post-starburst) galaxies, having the H$δ$~absorption line with an equivalent width $>2.5Å$ and no distinct emission lines in [O II] and H$α$. The E+A features we identified from the BCGs for the first time are not as significant as those in general galaxies, indicating that historically the star formation were not very violent.

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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