arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0909.3866astro-ph.CO
收藏

早型星系中电离气体的性质

The nature of ionized gas in early-type galaxies

F. Annibali, A. Bressan, R. Rampazzo, W. W. Zeilinger

摘要:

我们提出了一个样本的65个附近的早型星系,我们已经获得了光学中分辨率光谱的电离气体的研究。在约89%的样品中检测到发射线。发射的发生率似乎独立于E或S 0形态类。根据经典的诊断图,大多数星系都是LINER。然而,星系倾向于向“合成”区域移动(在较低的[NII]/Halpha值),因为发射线是在更大的银河系中心距离测量的。这表明不同的电离机制可能在LINER中起作用。

英文摘要:

We present a study of the ionized gas in a sample of 65 nearby early-type galaxies, for which we have acquired optical intermediate-resolution spectra. Emission lines are detected in ~89 % of the sample. The incidence of emission appears independent from the E or S0 morphological classes. According to classical diagnostic diagrams, the majority of the galaxies are LINERs. However, the galaxies tend to move toward the "Composites" region (at lower [NII]/Halpha values) as the emission lines are measured at larger galacto-centric distances. This suggests that different ionization mechanisms may be at work in LINERs.

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。

↑