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arXiv 1701.04501astro-ph.GAastro-ph.CO
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重遮蔽类星体SDSS J000610 .67+121501.2中的紫外线和光学发射线外流:在尘埃环和更远的尺度上

Ultraviolet and Optical Emission-line Outflows in the Heavily Obscured Quasar SDSS J000610.67+121501.2: At the Scale of the Dusty Torus and Beyond

Shaohua Zhang, Hongyan Zhou, Xiheng Shi, Xiang Pan, Ji Wang, Ning Jiang, Tuo Ji, Peng Jiang, Wenjuan Liu, Huiyuan Wang

摘要:

活动星系核(AGN)的宽发射线外流已经提出了很多年,但由于引力束缚发射和外流发射的共存,很难定量研究。本文详细分析了一个严重变红的类星体SDSS J000610.67+121501.2,它的正常紫外宽发射线(BELs)被作为天然“日冕物质”的尘埃环严重抑制,因此蓝移BELs(BBELs)可以被可靠地测量。导出了电离参数$U \sim 10^{-0.5}$、柱密度$N_{\rm H}\sim 10^{22.0}$ cm $^{-2}$、$\sim 0.1$的覆盖率和上限密度$n_{\rm H}\sim 10^{5.8}$ cm $^{-3}$。流出的气体距离中央引擎至少41 pc,这表明它们已经扩展到尘埃环的规模或更远。此外,Lya显示了一个狭窄的对称分量,令我们惊讶的是,这是在任何其他线路中未检测到的。在考察了窄发射线区域和作为Lya窄线起源的恒星形成区域之后,我们提出外流的最终结果,即在较大区域中扩散的气体,充当Lya光子的屏蔽。需要未来的高空间分辨率光谱测量和/或分光偏振观测来做出最终澄清。

英文摘要:

Broad emission-line outflows of active galactic nuclei (AGNs) have been proposed for many years but are very difficult to quantitatively study because of the coexistence of the gravitationally-bound and outflow emission. We present detailed analysis of a heavily reddened quasar, SDSS J000610.67+121501.2, whose normal ultraviolet (UV) broad emission lines (BELs) are heavily suppressed by the Dusty Torus as a natural "Coronagraph", thus the blueshifted BELs (BBELs) can be reliably measured. The physical properties of the emission-line outflows are derived as follows: ionization parameter $U \sim 10^{-0.5}$, column density $N_{\rm H}\sim 10^{22.0}$ cm$^{-2}$, covering fraction of $\sim 0.1$ and upper limit density of $n_{\rm H}\sim 10^{5.8}$ cm$^{-3}$. The outflow gases are located at least 41 pc away from the central engine, which suggests that they have expanded to the scale of the dust torus or beyond. Besides, Lya shows a narrow symmetric component, to our surprise, which is undetected in any other lines. After inspecting the narrow emission-line region and the starforming region as the origin of the Lya narrow line, we propose the end-result of outflows, diffusing gases in the larger region, acts as the screen of Lya photons. Future high spatial resolution spectrometry and/or spectropolarimetric observation are needed to make a final clarification.

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。

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