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arXiv 1610.02871astro-ph.GA
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X射线选择的BALQSO

X-ray selected BALQSOs

M. J. Page, F. J. Carrera, M. Ceballos, A. Corral, J. Ebrero, P. Esquej, M. Krumpe, S. Mateos, S. Rosen, A. Schwope, A. Streblyanska, M. Symeonidis, J. A. Tedds, M. G. Watson

备注：
8 pages. Accepted for publication in MNRAS
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摘要：

我们研究了XMM-牛顿广角巡天中的六个X射线选择宽吸收线类星体。所有六个对象被归类为BALQSO使用经典的balnicity指数，它们一起形成的最大的样本的X射线选择BALQSO。我们在所有六个物体的X射线光谱中发现了吸收的证据。电离吸收模型适用于X射线光谱形状，这将是典型的非BAL类星体（能量指数α =0.98的幂律）提供了可接受的适合所有六个对象的X射线光谱。X射线选定的BALQSO的光学到X射线光谱指数α_OX的平均值为1.69 ± 0.05，这与紫外光度相似的X射线选定和光学选定的非BAL QSO的平均值相似。相比之下，光学选择的BALQSO通常具有大得多的α_OX，因此被表征为X射线弱。结果表明，X射线选择产生内在的X射线明亮的BALQSO，但它们的X射线光谱吸收的程度类似于在光学选择BALQSO样品中看到的; X射线吸收似乎是无处不在的BALQSO，但X射线弱点不是。我们认为，BALQSO坐在一个频谱的一端的X射线吸收性质的QSO有关的紫外线吸收的程度在C IV 1550。

英文摘要：

We study a sample of six X-ray selected broad absorption line (BAL) quasi-stellar objects (QSOs) from the XMM-Newton Wide Angle Survey. All six objects are classified as BALQSOs using the classic balnicity index, and together they form the largest sample of X-ray selected BALQSOs. We find evidence for absorption in the X-ray spectra of all six objects. An ionized absorption model applied to an X-ray spectral shape that would be typical for non-BAL QSOs (a power law with energy index alpha=0.98) provides acceptable fits to the X-ray spectra of all six objects. The optical to X-ray spectral indices, alpha_OX, of the X-ray selected BALQSOs, have a mean value of 1.69 +- 0.05, which is similar to that found for X-ray selected and optically selected non-BAL QSOs of similar ultraviolet luminosity. In contrast, optically-selected BALQSOs typically have much larger alpha_OX and so are characterised as being X-ray weak. The results imply that X-ray selection yields intrinsically X-ray bright BALQSOs, but their X-ray spectra are absorbed by a similar degree to that seen in optically-selected BALQSO samples; X-ray absorption appears to be ubiquitous in BALQSOs, but X-ray weakness is not. We argue that BALQSOs sit at one end of a spectrum of X-ray absorption properties in QSOs related to the degree of ultraviolet absorption in C IV 1550.

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