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arXiv 0708.4192astro-ph
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用Chandra HETGS和XMM-牛顿EPIC和RGS光谱探测窄发射线星系NGC 2110的统一

Probing Unification With Chandra HETGS and XMM-Newton EPIC And RGS Spectroscopy of the Narrow Emission Line Galaxy NGC 2110

Daniel A. Evans, Julia C. Lee, T. Jane Turner, Kimberly A. Weaver, Herman L. Marshall

摘要:

我们目前的结果,从钱德拉HETGS(250千分之二的时代)和XMM牛顿EPIC和RGS(60千分之一)的NGC 2110,这在历史上已被归类为窄发射线星系的观测。我们的研究结果支持的解释,源是塞弗特2通过一个补丁吸收器。源的核X射线光谱最好用光子指数$Γ$ ~1.7的幂律来描述,并通过从中心超大质量黑洞很远距离处的多层中性物质吸收来修改。我们报告了Fe K $α$和Si K $α$线的强探测,这些线用Chandra HETGS勉强分辨,并且我们将荧光材料的发射半径限制为>1 pc。有一些证据表明,在狭窄的Fe K $α$核心的速度~4500 km s $^{-1}$的基础上适度的额外增宽。我们在钱德拉MEG和XMM-牛顿RGS光谱中发现了电离发射(O VIII Ly $α$,O VIII RRC特征,可能还有Ne IX禁戒线)的初步证据,这可能与已知的扩展X射线发射有关,该辐射距离核约160 pc。我们认为,$10^{23}$厘米$^{-2}$部分覆盖吸收起源于宽线区域云附近的活动星系核,和$3\times10^{22}$厘米$^{-2}$覆盖者很可能有一个更遥远的起源,并有一个扁平的几何形状,以允许小规模的射电喷流逃逸。

英文摘要:

We present results from Chandra HETGS (250 ks over two epochs) and XMM-Newton EPIC and RGS (60 ks) observations of NGC 2110, which has been historically classified as a Narrow Emission Line Galaxy galaxy. Our results support the interpretation that the source is a Seyfert 2 viewed through a patchy absorber. The nuclear X-ray spectrum of the source is best described by a power law of photon index $Γ$ ~1.7, modified by absorption from multiple layers of neutral material at a large distance from the central supermassive black hole. We report the strong detections of Fe K$α$ and Si K$α$ lines, which are marginally resolved with the Chandra HETGS, and we constrain the emission radius of the fluorescing material to >1 pc. There is some evidence for modest additional broadening at the base of the narrow Fe K$α$ core with a velocity ~4500 km s$^{-1}$. We find tentative evidence for ionized emission (O VIII Ly $α$, an O VIII RRC feature, and possibly a Ne IX forbidden line) in the Chandra MEG and XMM-Newton RGS spectra, which could be associated with the known extended X-ray emission that lies ~160 pc from the nucleus. We suggest that the $10^{23}$ cm$^{-2}$ partially covering absorber originates in broad-line region clouds in the vicinity of the AGN, and that the $3\times10^{22}$ cm$^{-2}$ coverer is likely to have a more distant origin and have a flattened geometry in order to allow the small-scale radio jet to escape.

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