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arXiv 1404.4569astro-ph.CO
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作为重子声学振荡探测器的C IV森林

The C IV forest as a probe of baryon acoustic oscillations

Matthew M. Pieri

摘要:

根据最近用Lyman $α$(Ly $α$)跃迁测量类星体吸收中的重子声学振荡的成功经验,探讨了用三重电离碳(C IV)的1548 π跃迁作为示踪剂的可能性.虽然Ly-alpha森林是星系际气体的更灵敏的示踪剂,但它受到这样一个事实的限制,即它只能在红移$z > 2$的光学窗口中测量。类星体在这些高红移下的识别和观测是具有挑战性的,但是C IV森林可以探测到红移$z \approx 1.3$,充分利用类星体红移分布中的峰值,可以高效地瞄准。我探索的C IV吸收信号的强度,并表明,在红色一侧的Ly-alpha发射线的吸收人口占主导地位的C IV(因此将占主导地位的潜在的BAO信号的其他金属)。因此,我认为,即将到来的调查可能有足够的增加类星体的数量密度,以抵消较低的敏感性的C IV森林,并提供竞争力的精度使用C IV自相关和C IV类星体的互相关在$< z > \approx 1.6$。

英文摘要:

In light of recent successes in measuring baryon acoustic oscillations in quasar absorption using the Lyman $α$ (Ly$α$) transition, I explore the possibility of using the 1548Å transition of triply ionized carbon (C IV) as a tracer. While the Ly-alpha forest is a more sensitive tracer of intergalactic gas, it is limited by the fact that it can only be measured in the optical window at redshifts $z > 2$. Quasars are challenging to identify and observe at these high-redshifts, but the C IV forest can be probed down to redshifts $z \approx 1.3$, taking full advantage of the peak in the redshift distribution of quasars that can be targeted with high efficiency. I explore the strength of the C IV absorption signal and show that the absorbing population on the red side of the Ly-alpha emission line is dominated by C IV (and so will dominate over the potential BAO signal of other metals). As a consequence, I argue that forthcoming surveys may have a sufficient increase in quasar number density to offset the lower sensitivity of the C IV forest and provide competitive precision using both the C IV autocorrelation and the C IV-quasar cross-correlation at $< z > \approx 1.6$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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