标题： 宇宙微波背景辐射宇宙弦候选体的光学分析 显示英文标题

标题： Optical analysis of a CMB cosmic string candidate

摘要： 宇宙弦（CSs）的宇宙学情景的复杂性仍然阻碍了全面理解。 我们在这里描述了一种可能检测这些难以捉摸的物理实体的有前景的策略。 该策略基于在宇宙弦候选体（CSc-1）的位置区域寻找强引力透镜事件，该候选体之前通过宇宙微波背景分析被宣布。 使用光度和几何标准，我们在“弦场”（SF）中识别出透镜星系对（LGCs），然后将其与一组“控制场”（CFs）中背景星系对的平均密度进行比较。 我们在SF中发现了每平方度$22\%$的LGCs的过量，这超过了估计的宇宙离散度。 我们还发现，在角分离区间$[8'', 9'']$中，LGCs的数量超过了$29.2\%$。 最后，我们分析了连接LGCs中心的线的优选方向的可能性。 对于角分离区间$[4'',6'']$，该方向在统计上是显著的。 因此，我们在可能的CS上发现了两个LGCs的优选角分离“窗口”。 然而，确认我们的LGCs的引力透镜起源需要光谱观测，而目前的结果似乎证明了这一点。 我们计划获取它们的光谱，并继续研究CSc-1区域中LGCs的光谱和形态特征，并使用相同策略分析其他CS候选体。 显示英文摘要

摘要： The complexity of the cosmological scenario regarding cosmic strings (CSs) stands still in the way of a complete understanding. We describe here a promising strategy for the possible detection of these elusive physical entities. It is based on the search of strong gravitational lensing events in the location area of the CS candidate (CSc-1), which was declared in a previous work by CMB analysis. Using photometric and geometric criteria, we identified pairs of candidates of lensed galaxies (LGCs) in the "string field" (SF), which were then compared with the average density of background galaxy pairs in a set of "control fields" (CFs). We found an excess of $22\%$ (per sq. deg.) of the LGCs in SF, which exceeds the estimated cosmic dispersion. We also found that the number of LGCs is in excess of $29.2\%$ in the angular separation bin $[8'', 9'']$. Finally, we analysed the possibility of a preferred orientation of the line connecting the centres of the LGCs. The orientation is statistically significant for an angular separation bin $[4'',6'']$. Therefore, we found two "windows" for the preferred angular separation for LGCs along the possible CS. However, the confirmation of the gravitational lensing origin of our LGCs requires spectroscopic observations which seem to be justified by the present results. We plan to acquire their spectra as well as to continue the study of the spectral and morphological features of the LGCs in the CSc-1 field and to analyse the other CS-candidates using the same strategy.