AzTEC half square degree survey of the SHADES fields â?? I. Maps, catalogues and source counts
AzTEC half square degree survey of the SHADES fields â?? I. Maps, catalogues and source counts
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AzTEC SHADES 场的半平方度调查 – ??
DOI：
10.1111/j.1365-2966.2009.15620.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
Austermann J
中科院分区：
文献类型：
--
作者：
Austermann J
我们介绍了迄今为止进行的最大的银河系外深毫米波长测量的第一批结果。这些结果是用安装在詹姆斯·克莱克·麦克斯韦望远镜上的阿兹特克连续体相机在λ=1.1 mm处制作的覆盖0.7°2的地图得出的。这些地图是在两个最初以λ=850mJy m为目标的区域绘制的，其中包括水肺半度河外考察(SHADES)项目中的亚毫米共用测辐射热计阵列，即洛克曼洞东(绘制深度为0.9-1.3mJy rms)和斯巴鲁/μ-牛顿深场(绘制深度为1.0-1.7mJy rms)。这两个领域现有和即将提供的丰富的深多频数据将使这些新的广域1.1毫米图像所揭示的明亮毫米源群能够在随后的论文中得到详细的探索。在这里，我们介绍了地图本身，114个高重要性亚毫米星系探测的目录，以及一个彻底的统计分析，导致了迄今为止最可靠的1.1毫米源数的确定。这些新地图覆盖的面积几乎是水肺阴影地图的三倍，目前提供了以毫米或亚毫米为单位的高红移宇宙的最大宇宙体积样本。通过仔细的比较，我们发现，宇宙演化调查(COSMOS)和大观测站起源深度调查(GODS)北部区域，也是用阿兹特克成像的，含有比这里建立的新的1.1毫米源计数基线多出的毫米源。特别是，我们新的Aztec/Shades结果表明，非常明亮的高红移尘埃覆盖的星暴(S1.1 mm>；3mJy)比从这些较小的调查中推断的要少25%-50%，从而突出了宇宙变化和星团在此类测量中的潜在作用。我们比较了最近发展的毫米/亚毫米级源人口模型和这些亚毫米级明亮星系调查的计数预测，这为正在进行的星系形成的半解析和流体动力学模型的改进提供了重要的约束，并发现所有可用的模型都高估了这次调查中发现的明亮亚毫米星系的数量。
We present the first results from the largest deep extragalactic mm-wavelength survey undertaken to date. These results are derived from maps covering over 0.7 deg2, made at λ= 1.1 mm, using the AzTEC continuum camera mounted on the James Clerk Maxwell Telescope. The maps were made in the two fields originally targeted at λ= 850 μm with the Submillimetre Common-User Bolometer Array (SCUBA) in the SCUBA Half-Degree Extragalactic Survey (SHADES) project, namely the Lockman Hole East (mapped to a depth of 0.9–1.3 mJy rms) and the Subaru/XMM–NewtonDeep Field (mapped to a depth of 1.0–1.7 mJy rms). The wealth of existing and forthcoming deep multifrequency data in these two fields will allow the bright mm source population revealed by these new wide-area 1.1 mm images to be explored in detail in subsequent papers. Here, we present the maps themselves, a catalogue of 114 high-significance submillimetre galaxy detections, and a thorough statistical analysis leading to the most robust determination to date of the 1.1 mm source number counts. These new maps, covering an area nearly three times greater than the SCUBA SHADES maps, currently provide the largest sample of cosmological volumes of the high-redshift Universe in the mm or sub-mm. Through careful comparison, we find that both the Cosmic Evolution Survey (COSMOS) and the Great Observatories Origins Deep Survey (GOODS) North fields, also imaged with AzTEC, contain an excess of mm sources over the new 1.1 mm source-count baseline established here. In particular, our new AzTEC/SHADES results indicate that very luminous high-redshift dust enshrouded starbursts (S1.1mm> 3 mJy) are 25–50 per cent 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 sub-mm bright galaxy surveys, which provide important constraints for the ongoing refinement of semi-analytic and hydrodynamical models of galaxy formation, and find that all available models overpredict the number of bright submillimetre galaxies found in this survey.