AzTEC域的半平方度巡天-- I.地图、目录和源计数
AzTEC Half Square Degree Survey of the SHADES Fields -- I. Maps, Catalogues, and Source Counts
摘要：
我们提出了迄今为止进行的最大的深河外毫米波长调查的第一批结果。这些结果是由詹姆斯·克拉克·麦克斯韦望远镜上安装的阿兹TEC连续光谱相机拍摄的1.1毫米波段、覆盖0.7度^2的地图得出的。这些地图是在SHADES项目中最初以0.85 mm为目标的两个区域中制作的，即Lockman Hole East（映射到0.9-1.3 mJy rms的深度）和Subaru XMM Deep Field（1.0-1.7 mJy rms）。在这两个领域现有的和即将到来的深多频数据的财富将允许明亮的毫米源人口揭示这些图像将在随后的论文中详细探讨。在这里，我们提出了地图本身，114个高意义的亚毫米星系探测目录，以及一个彻底的统计分析，导致迄今为止最强大的确定1.1毫米源数计数。通过仔细的比较，我们发现，无论是COSMOS和GOODS北场，也与AzTEC成像，包含超过新的1.1毫米源计数基线在这里建立的毫米源。特别是，我们新的AzTEC/SHADES结果表明，非常明亮的高红移尘埃掩盖的恒星爆发（S_{1.1} > 3 mJy）比从这些较小的调查中推断的要少25-50%，从而突出了宇宙方差和集群在此类测量中的潜在作用。我们比较了最近的模型的不断发展的毫米/亚毫米源人口的这些SMG调查，这提供了重要的限制，正在进行的改进半解析和流体动力学模型的星系形成的数量计数预测，并发现所有最近的模型过度预测的数量在本次调查中发现的明亮的亚毫米星系。
英文摘要：
We present the first results from the largest deep extragalactic millimetre-wavelength survey undertaken to date. These results are derived from maps covering over 0.7 deg^2, made at 1.1mm, using the AzTEC continuum camera mounted on the James Clerk Maxwell Telescope. The maps were made in the two fields originally targeted at 0.85mm with SCUBA in the SHADES project, namely the Lockman Hole East (mapped to a depth of 0.9-1.3 mJy rms) and the Subaru XMM Deep Field (1.0-1.7 mJy rms). The wealth of existing and forthcoming deep multi-frequency data in these two fields will allow the bright mm source population revealed by these images to be explored in detail in subsequent papers. Here we present the maps themselves, a catalogue of 114 high-significance sub-millimetre galaxy detections, and a thorough statistical analysis leading to the most robust determination to date of the 1.1mm source number counts. Through careful comparison, we find that both the COSMOS and GOODS North fields, also imaged with AzTEC, contain an excess of mm sources over the new 1.1mm source-count baseline established here. In particular, our new AzTEC/SHADES results indicate that very luminous high-redshift dust enshrouded starbursts (S_{1.1} > 3 mJy) are 25-50% less common than would have been inferred from these smaller surveys, thus highlighting the potential roles of cosmic variance and clustering in such measurements. We compare number count predictions from recent models of the evolving mm/sub-mm source population to these SMG surveys, which provide important constraints for the ongoing refinement of semi-analytic and hydrodynamical models of galaxy formation, and find that all recent models over-predict the number of bright sub-millimetre galaxies found in this survey.
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