论文标题
弱线类星体的代表性样本的敏感Chandra覆盖范围：揭示全部X射线特性
Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
论文作者
论文摘要
我们提出了代表性样本中弱线类星体（WLQ）的更深的Chandra观察结果，该样品先前具有有限的X射线约束，并执行X射线光度分析，以揭示WLQS的X射线特性的全范围。这些代表性样本中包含的32个WLQ中只有5个在这些观察后仍未被检测到X射线，并且堆叠分析表明，这5个平均X射线弱点为> 85。样本中的WLQ之一是已知具有极端X射线变化状态的X射线变化，SDSS j1539+3954的差异很大，X射线均具有极大的变化。在其余框架中〜3个月。对于X射线通量变化的短时尺度，$ \ gtrsim $ 9的倍数进一步支持厚度磁盘和流出（TDO）模型，该模型旨在解释WLQ的X射线和多波长特性。 WLQ的X射线到光学特性的总体分布表明，TDO具有X射线发射区域的平均覆盖率，TDO的圆柱密度范围从$ N _ {\ rm H} $ h} $ \ sim $ \ sim 10^{23-24}〜{23-24}〜{\ rm cm cm} $ cm} $ \ gtrsim 10^{24}〜{\ rm cm}^{ - 2} $，在WLQ中导致不同级别的吸收和康普顿反射（和/或散射）。
We present deeper Chandra observations for weak-line quasars (WLQs) in a representative sample that previously had limited X-ray constraints, and perform X-ray photometric analyses to reveal the full range of X-ray properties of WLQs. Only 5 of the 32 WLQs included in this representative sample remain X-ray undetected after these observations, and a stacking analysis shows that these 5 have an average X-ray weakness factor of > 85. One of the WLQs in the sample that was known to have extreme X-ray variability, SDSS J1539+3954, exhibited dramatic X-ray variability again: it changed from an X-ray normal state to an X-ray weak state within ~ 3 months in the rest frame. This short timescale for an X-ray flux variation by a factor of $\gtrsim$ 9 further supports the thick disk and outflow (TDO) model proposed to explain the X-ray and multiwavelength properties of WLQs. The overall distribution of the X-ray-to-optical properties of WLQs suggests that the TDO has an average covering factor of the X-ray emitting region of ~ 0.5, and the column density of the TDO can range from $N_{\rm H}$ $\sim 10^{23-24}~{\rm cm}^{-2}$ to $N_{\rm H}$ $\gtrsim 10^{24}~{\rm cm}^{-2}$, which leads to different levels of absorption and Compton reflection (and/or scattering) among WLQs.
