亚毫米星系的强透镜：前景结构的示踪物？
Strong lensing of submillimetre galaxies: A tracer of foreground structure?
摘要：
明亮的亚毫米星系（SMG）的陡峭的源计数和负K修正表明，在高通量密度下观察到的那些星系中有很大一部分可能是引力透镜，并且透镜物体可能经常位于红移大于1的星系团，这些星系团很难通过其他手段探测到。在这种情况下，可以使用对明亮SMG的跟踪来识别沿着视线的密集结构。在这里，我们调查的概率SMG经历强透镜，使用最新的N体模拟和观察到的源通量和红移分布。我们发现，几乎所有的高红移源的流量密度超过100 mJy将透镜，如果他们不是相对本地的星系。我们还估计了经历强透镜效应的源的分数作为观测到的通量密度的函数。这对规划未来SCUBA-2和其他仪器调查中发现的明亮SMG的后续观测具有影响。在这些计算中最大的不确定性是最大允许的透镜放大，这是目前未知的SMG的空间范围占主导地位。
英文摘要：
The steep source counts and negative K-corrections of bright submillimetre galaxies (SMGs) suggest that a significant fraction of those observed at high flux densities may be gravitationally lensed, and that the lensing objects may often lie at redshifts above 1, where clusters of galaxies are difficult to detect through other means. In this case follow-up of bright SMGs may be used to identify dense structures along the line of sight. Here we investigate the probability for SMGs to experience strong lensing, using the latest N-body simulations and observed source flux and redshift distributions. We find that almost all high redshift sources with a flux density above 100mJy will be lensed, if they are not relatively local galaxies. We also give estimates of the fraction of sources experiencing strong lensing as a function of observed flux density. This has implications for planning follow-up observations for bright SMGs discovered in future surveys with SCUBA-2 and other instruments. The largest uncertainty in these calculations is the maximum allowed lensing amplification, which is dominated by the presently unknown spatial extent of SMGs.
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