标题： 斯隆数字天空调查中光学最亮的微型 broad absorption line (BAL) 类星体的 X 射线特性 显示英文标题

标题： The X-Ray Properties of the Optically Brightest Mini-BAL Quasars from the Sloan Digital Sky Survey

摘要： 我们收集了斯隆数字天空调查数据发布5版的类星体目录中的14个最亮的光学射电宁静类星体样本（$m_{i}$~$\le$~17.5 和$z$~$\ge$~1.9），这些类星体的光谱中存在C IV mini-BAL。 这12个天体的X射线数据是通过使用ACIS-S的查德拉快照调查获得的，另外两个类星体的数据则来自存档的XMM-牛顿观测。 联合X射线光谱分析显示，mini-BAL类星体的平均幂律光子指数（$\Gamma\approx1.9$）和固有吸收水平（$N_H \lesssim 8\times 10^{21} \ {\rm cm}^{-2}$）与非BMB（既非BAL也非mini-BAL）类星体相似。 相对于X射线亮度分布（通过$\Delta\alpha_{\rm ox}$评估），mini-BAL类星体与非BMB类星体更为相似，而不是BAL类星体。 相对颜色表明，mini-BAL类星体的光学光谱中有轻微的尘埃消红现象。 对于一个由56个源组成的样本，这些源结合了具有高信噪比的静帧UV光谱的mini-BAL和BAL类星体，证实了$\Delta\alpha_{\rm ox}$与UV吸收性质之间存在显著的相关性，这通常支持了一种模型，在这种模型中，X射线吸收在驱动UV吸收线风中起着重要作用。 我们还提出了mini-BAL和BAL类星体的UV吸收性质的替代参数化方法，这可能在某些方面更好地描述宽吸收谷。 显示英文摘要

摘要： We have compiled a sample of 14 of the optically brightest radio-quiet quasars ($m_{i}$~$\le$~17.5 and $z$~$\ge$~1.9) in the Sloan Digital Sky Survey Data Release 5 quasar catalog that have C IV mini-BALs present in their spectra. X-ray data for 12 of the objects were obtained via a Chandra snapshot survey using ACIS-S, while data for the other two quasars were obtained from archival XMM-Newton observations. Joint X-ray spectral analysis shows the mini-BAL quasars have a similar average power-law photon index ($\Gamma\approx1.9$) and level of intrinsic absorption ($N_H \lesssim 8\times 10^{21} \ {\rm cm}^{-2}$) as non-BMB (neither BAL nor mini-BAL) quasars. Mini-BAL quasars are more similar to non-BMB quasars than to BAL quasars in their distribution of relative X-ray brightness (assessed with $\Delta\alpha_{\rm ox}$). Relative colors indicate mild dust reddening in the optical spectra of mini-BAL quasars. Significant correlations between $\Delta\alpha_{\rm ox}$ and UV absorption properties are confirmed for a sample of 56 sources combining mini-BAL and BAL quasars with high signal-to-noise ratio rest-frame UV spectra, which generally supports models in which X-ray absorption is important in enabling driving of the UV absorption-line wind. We also propose alternative parametrizations of the UV absorption properties of mini-BAL and BAL quasars, which may better describe the broad absorption troughs in some respects.