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arXiv 0710.3696astro-ph
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SA57活动星系核的光谱学

Optical Spectroscopy of Active Galactic Nuclei in SA57

D. Trevese, V. Zitelli, F. Vagnetti, K. Boutsia, G. M. Stirpe

摘要:

X射线选择和光学选择的活动星系核(AGN)的宇宙学演化表现出不同的行为解释的两个不同的人口。这种差异主要表现在低光度活动星系核(LLAGNs)上,其中许多在光学光度测量中丢失了。我们正在进行光谱研究的复合样品的活动星系核的候选人在SA 57以下不同的搜索技术,以确定低光度活动星系核和分解成不同类别的对象的样品。活动星系核候选者是通过光学变化和/或X射线发射获得的。特别令人感兴趣的是扩展变星,预计它们是LLAGN所在的星系。在26个分类的天体中,有相当数量的天体(9个)显示出典型的活动星系核谱。10个天体显示出窄发射线星系光谱,其中大多数(8/10)的光学变化表明存在LLAGN。

英文摘要:

The cosmological evolution of X-ray-selected and optically selected Active Galactic Nuclei (AGNs) show different behaviours interpreted in terms of two different populations. The difference is evident mainly for low luminosity AGNs (LLAGNs), many of which are lost by optical photometric surveys. We are conducting a spectroscopical study of a composite sample of AGN candidates selected in SA57 following different searching techniques, to identify low luminosity AGNs and break down the sample into different classes of objects. AGN candidates were obtained through optical variability and/or X-ray emission. Of special interest are the extended variable objects, which are expected to be galaxies hosting LLAGNs. Among the 26 classified objects a fair number (9) show typical AGN spectra. 10 objects show Narrow Emission Line Galaxy spectra, and in most of them (8/10) optical variability suggests the presence of LLAGNs.

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