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arXiv 1006.1995astro-ph.CO
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H1413 +117中的微透镜:宽吸收线类星体中的线轮廓发射和吸收的解纠缠

Microlensing in H1413+117 : disentangling line profile emission and absorption in a broad absorption line quasar

D. Hutsemekers, B. Borguet, D. Sluse, P. Riaud, T. Anguita

摘要:

在对引力透镜宽吸收线(BAL)类星体H1413+117的四个分量进行了16年光谱观测的基础上,分析了观测到的天鹅座P型谱线剖面的光谱差异,并利用微透镜效应获得了BAL剖面形成的新线索。我们证实,在组分D中观察到的光谱差异可以归因于持续至少十年的微透镜效应。我们表明,微透镜放大图像D中的连续光源,使发射线区域基本上不受影响。我们解释的差异中看到的成分D的吸收曲线作为一个发射线叠加到一个几乎黑色的吸收曲线的结果。我们还发现,连续谱源和一部分宽发射线区域可能在组分C中被缩小,而组分A和B不受微透镜的影响。我们表明,在组件D中的连续源的微透镜有一个色依赖兼容的标准沙库拉-Sunyaev吸积盘的热连续辐射。使用简单的分解方法将受微透镜影响且来自紧凑区域的线轮廓部分与不受该效应影响且来自较大区域的部分分开,我们将真实吸收线轮廓与真实发射线轮廓分开。提取的发射线轮廓出现双峰,这表明发射被强吸收体遮蔽,速度比全吸收轮廓窄,并且自身发射很少。我们认为,H1413+117周围的外流是由一个高速极流和一个密度较大,速度较低的磁盘看到近边缘。

英文摘要:

On the basis of 16 years of spectroscopic observations of the four components of the gravitationally lensed broad absorption line (BAL) quasar H1413+117, covering the ultraviolet to visible rest-frame spectral range, we analyze the spectral differences observed in the P Cygni-type line profiles and have used the microlensing effect to derive new clues to the BAL profile formation. We confirm that the spectral differences observed in component D can be attributed to a microlensing effect lasting at least a decade. We show that microlensing magnifies the continuum source in image D, leaving the emission line region essentially unaffected. We interpret the differences seen in the absorption profiles of component D as the result of an emission line superimposed onto a nearly black absorption profile. We also find that the continuum source and a part of the broad emission line region are likely de-magnified in component C, while components A and B are not affected by microlensing. We show that microlensing of the continuum source in component D has a chromatic dependence compatible with the thermal continuum emission of a standard Shakura-Sunyaev accretion disk. Using a simple decomposition method to separate the part of the line profiles affected by microlensing and coming from a compact region from the part unaffected by this effect and coming from a larger region, we disentangle the true absorption line profiles from the true emission line profiles. The extracted emission line profiles appear double-peaked, suggesting that the emission is occulted by a strong absorber, narrower in velocity than the full absorption profile, and emitting little by itself. We propose that the outflow around H1413+117 is constituted by a high-velocity polar flow and a denser, lower velocity disk seen nearly edge-on.

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