AzTEC对COSMOS油田的毫米测量- II。源计数过密及其与大尺度结构的关系
AzTEC Millimetre Survey of the COSMOS Field - II. Source Count Overdensity and Correlations with Large-Scale Structure
摘要：
我们报告了在0.15平方米的明亮的亚毫米星系（SMG）的过度密度。°的AzTEC/COSMOS巡天和SMG与z <~ 1.1的光学红外星系密度之间的空间相关性。COSMOS场的这一部分显示了与背景或“空白场”人口模型相比，SMG探测的稳健性超过了3 σ，这与SMG对没有河外偏差的场的调查一致。SMG过密度在非常亮的探测数量（14个源的测量通量S（1.1 mm）> 6 mJy）中最为显著，这与我们采用的空白场数密度内的样本方差完全不相容，并推断过密度显著性>> 4。我们发现，超密度和空间相关的光学红外星系密度是最一致的透镜的背景SMG人口的前景质量结构沿视线，而不是物理关联的SMG与z <~ 1.1星系/集群。SMG的位置与弱透镜映射只有微弱的相关性，这表明相关性的主要来源是个别星系和该地区更脆弱的结构，而不是大质量和紧凑的星系团。这些结果突出了宇宙变化和大尺度结构在SMG研究中的重要作用。
英文摘要：
We report an over-density of bright sub-millimetre galaxies (SMGs) in the 0.15 sq. deg. AzTEC/COSMOS survey and a spatial correlation between the SMGs and the optical-IR galaxy density at z <~ 1.1. This portion of the COSMOS field shows a ~ 3-sigma over-density of robust SMG detections when compared to a background, or "blankfield", population model that is consistent with SMG surveys of fields with no extragalactic bias. The SMG over-density is most significant in the number of very bright detections (14 sources with measured fluxes S(1.1mm) > 6 mJy), which is entirely incompatible with sample variance within our adopted blank-field number densities and infers an over-density significance of >> 4. We find that the over-density and spatial correlation to optical-IR galaxy density are most consistent with lensing of a background SMG population by foreground mass structures along the line of sight, rather than physical association of the SMGs with the z <~ 1.1 galaxies/clusters. The SMG positions are only weakly correlated with weak-lensing maps, suggesting that the dominant sources of correlation are individual galaxies and the more tenuous structures in the region and not the massive and compact clusters. These results highlight the important roles cosmic variance and large-scale structure can play in the study of SMGs.
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