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arXiv 0801.1109astro-ph
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具有Kyoto3DII的E+A(post-starburst)星系的积分场光谱

Integrated field spectroscopy of E+A (post-starburst) galaxies with the Kyoto3DII

Tomotsugu Goto, Atsushi Kawai, Atsushi Shimono, Hajime Sugai, Masafumi Yagi, Takashi Hattori

摘要:

我们用Kyoto 3DII积分场摄谱仪对附近的三个E+A星系进行了二维光谱观测。在所有的情况下,Hdelta吸收在星系的中心是较强的,但在几个千秒差距的规模显着扩大。对于其中一个星系(J1656),我们发现了一个具有相同红移的近距离伴星系。该星系原来是一个恒星形成星系,具有强烈的H伽马辐射。对于另外两个星系,我们发现中心的星暴后区域可能向潮汐尾方向延伸。我们的研究结果是一致的合并/相互作用起源的E+A星系,在那里的下沉气体可能造成的星系星系合并创建一个中心的恒星暴,成功的后恒星暴(E+A)阶段,一旦气体耗尽。

英文摘要:

We have performed a two-dimensional spectroscopy of three nearby E+A (post-starburst) galaxies with the Kyoto3DII integral field spectrograph. In all the cases, Hdelta absorption is stronger at the centre of the galaxies, but significantly extended in a few kpc scale. For one galaxy (J1656), we found a close companion galaxy at the same redshift. The galaxy turned out to be a star-forming galaxy with a strong emission in Hgamma. For the other two galaxies, we have found that the central post-starburst regions possibly extend toward the direction of the tidal tails. Our results are consistent with the merger/interaction origin of E+A galaxies, where the infalling-gas possibly caused by a galaxy-galaxy merging creates a central-starburst, succeeded by a post-starburst (E+A) phase once the gas is depleted.

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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