寻找辐射线驱动的特征：在BALQSO大样本中Ly-alpha-N-V线锁定特征的缺乏
Searching for the signature of radiative line driving: On the absence of Ly-alpha-N V line-locking features in a large sample of BALQSOs
摘要：
我们已经搜索了Scaringi等人的混合BALQSO目录。从SDSS的DR 5衍生，以汇编显示光谱特征的对象的最大样本，这可能是辐射线驱动的指示。问题中的功能是“鬼的Ly-alpha”，线锁定功能以前确定的广泛的C IV和Si IV吸收线的一小部分BALQSO，并通过Ly-alpha光子与N V离子的相互作用形成。我们测试，在可能的情况下，所需的标准，以产生一个可观察到的鬼功能，并发现这些标准不符合显着更经常在鬼候选人比在比较样品选择表现出相对无特征的广泛的吸收槽。事实上，我们在我们的幽灵候选者和比较样本之间发现的唯一显著差异是，平均而言，我们的幽灵候选者样本显示出（i）明显更强的NV吸收，以及（ii）吸收的开始发生在我们的幽灵候选者对象中的较低速度。值得注意的是，我们没有发现任何证据的对象，其吸收槽括号的Ly-alpha-NV线锁定区域的位置，而幽灵般的功能的位置似乎是独立的任何系统的速度。因此，这里被识别为强重影候选者的大多数物体可能是多槽闯入者，其吸收特征简单地包围了感兴趣的区域。
英文摘要：
We have searched the hybrid BALQSO catalogue of Scaringi et al. derived from DR5 of the SDSS in order to compile the largest sample of objects displaying spectral signatures which may be indicative of radiative line driving. The feature in question is the "ghost of Ly-alpha", a line-locking feature previously identified in the broad C IV and Si IV absorption lines of a small fraction of BALQSOs, and formed via the interaction of Ly-alpha photons with N V ions. We test, where possible the criteria required to produce an observable ghost feature and find that these criteria are not met significantly more often in ghost-candidates than in a comparison sample chosen to exhibit relatively featureless broad absorption troughs. Indeed, the only significant differences we find between our ghost-candidate and comparison samples, is that on average, our ghost-candidate sample displays (i) significantly stronger N V absorption, and (ii) the onset of absorption occurs at lower velocities in our ghost-candidate objects. Significantly, we find no evidence for an excess of objects whose absorption troughs bracket the location of the Ly-alpha-N V line-locking region, rather the location of ghost-like features appears to be independent of any systematic velocity. Thus, the majority of objects identified here as strong ghost-candidates are likely multi-trough interlopers whose absorption feature simply bracket the region of interest.
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