低电离核发射线区的两个物理上不同的粒子群
Two Physically Distinct Populations of Low-Ionization Nuclear Emission-Line Regions
摘要：
低电离核发射线区的性质一直是一个悬而未决的问题。我们从几个不同的方面研究了LINER的性能。发现LINER由两个不同的类别组成，这两个类别在传统的BPT图中可以清楚地分开，特别是在[OI]/Ha与[OIII]/Hb图中。具有高[O]/Ha比率（群体I）的LINER在几个性质上不同于具有低比率（群体II）的LINER。宽发射线仅在I族LINER的光谱中被识别。而只有星族II LINER显示出明亮的红外辐射和发生核心坍缩的超新星在主机。将这些结果与已知的恒星星族分布相结合，不仅表明这两个星族具有不同的线激发机制，而且暗示它们处于不同的演化阶段。
英文摘要：
The nature of Low-ionization Nuclear Emission-line Regions (LINERs) has been an open question for a long time. We study the properties of LINERs from several different aspects. The LINERs are found to consist of two different categories that can be clearly separated in the traditional BPT diagrams, especially in the [OI]/Ha vs. [OIII]/Hb diagram. LINERs with high [O]/Ha ratios (population I) differ from ones with low ratios (population II) in several properties. Broad emission lines are only identified in the spectra of population I LINERs. While only the population II LINERs show luminous infrared emission and occurrence of core-collapse supernovae in the host. Combining these results with the known distribution of stellar populations not only suggests that the two populations have different line excitation mechanisms, but also implies that they are at different evolutionary stages.
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