银河系VHE源位置的可能相关性和银河平面内表面密度的增强
On the possible correlation of Galactic VHE source locations and enhancements of the surface density in the Galactic plane
摘要：
在对单个VHE源的研究中，人们注意到了极高能量源与天空中富含尘埃和气体的区域之间的联系。然而，这种相关性的统计意义，为整个人口的TeV检测尚未进行评估。在这里，我们提出了一个研究的VHE源在银河系中央地区的位置增强的物质含量的关联。我们通过两个经典的示踪剂：尘埃排放和强度的$^\textrm{12}$ CO（1 $\rightarrow$ 0）线的材料含量的估计。我们利用最近发布的全天空地图的天体物理前景的普朗克合作和广泛的现有的CO映射银河系的天空。为了检验相关性，我们从H.E.S.S.探测到的银河系内平面巡天源开始构建VHE源位置的随机样本。阵我们发现VHE来源和富含分子物质的区域的位置之间存在正相关性，在最好的情况下达到3.9sigma水平。然而，如果考虑选择标准的变化，则后者的置信度降低，这导致我们得出结论，正相关性还不能牢固地建立。为了牢固地建立相关性，将需要即将建立的VHE设施。
英文摘要：
The association of very-high energy sources with regions of the sky rich in dust and gas has been noticed in the study of individual VHE sources. However, the statistical significance of such correlation for the whole population of TeV detections has not been assessed yet. Here we present a study of the association of VHE sources in the central Galactic region with positions of enhanced material content. We obtain estimates of the material content through two classical tracers: dust emission and intensity of the $^\textrm{12}$CO(1$\rightarrow$0) line. We make use of the recently released all-sky maps of astrophysical foregrounds of the Planck Collaboration and of the extensive existing CO mapping of the Galactic sky. In order to test the correlation, we construct randomized samples of VHE source positions starting from the inner Galactic plane survey sources detected by the H.E.S.S. array. We find hints of a positive correlation between positions of VHE sources and regions rich in molecular material, which in the best of cases reaches the 3.9sigma level. The latter confidence is however decreased if variations in the selection criteria are considered, what lead us to conclude that a positive correlation cannot be firmly established yet. Forthcoming VHE facilities will be needed in order to firmly establish the correlation.
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