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arXiv 0707.0158astro-ph
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活动星系核与恒星形成的区别

Distinguishing Active Galactic Nuclei and Star Formation

Brent Groves, Lisa Kewley

摘要:

使用大发射线星系样品从斯隆数字巡天,我们表明,恒星形成星系,塞弗茨,低电离核发射线区域(LINER)形成明确分离的分支标准的光学诊断图。我们推导出一个新的经验分类方案,干净地分离这些发射线星系,使用强大的光学发射线。使用这种分类,我们确定了几个不同的主机星系的每个类的属性,其中,随着发射线分析,建议从一个类到另一个不断演变。作为最后的说明,我们介绍了模型的恒星形成星系和活动星系核窄线区域,可以解释标准发射线比图上的星系分布,并可能提出新的诊断整个发射光谱。

英文摘要:

Using the large emission line galaxy sample from the Sloan Digital Sky Survey we show that Star forming galaxies, Seyferts, and low-ionization nuclear emission-line regions (LINERs) form clearly separated branches on the standard optical diagnostic diagrams. We derive a new empirical classification scheme which cleanly separates these emission-line galaxies, using strong optical emission lines. Using this classification we identify a few distinguishing host galaxy properties of each class, which, along with the emission line analysis, suggest continuous evolution from one class to another. As a final note, we introduce models of both Starforming galaxies and AGN narrow line regions which can explain the distribution of galaxies on standard emission line ratio diagrams, and possibly suggest new diagnostics across the emission spectrum.

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