高红移伽马射线暴空间密度的椭球重采样分析
Spheroidal Resampling Analysis of High-Redshift Gamma-Ray Burst Spatial Densities
- University of Public Service（公共服务大学）
- Konkoly Observatory, Research center for Astronomy and Earth Sciences（孔科利天文台，地球与天文学研究中心）
- The University of Alabama in Huntsville（阿拉巴马大学亨茨维尔分校）
- Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville（阿拉巴马大学亨茨维尔分校空间等离子体与高空大气研究科学中心）
- Faculty of Science and Technology, University of Debrecen（德布勒森大学理学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究用椭球重采样法分析542个高红移GRBs的三维分布，验证武仙-北冕座长城信号稳定，发现南银半球无相当显著性结构，表明该方法可有效检验GRB过密区搜索。
AI中文摘要：
伽马射线暴（GRBs）是可在高红移处观测到的明亮暂现源，因此可作为遥远大尺度结构的示踪物，不过GRB红移样本稀疏且受强选择效应影响。我们分析了542个具有光谱红移的GRBs的三维分布，该方法扩展了我们早期的球窗搜索，将球形计数体积替换为轴对称椭球。在蒙特卡洛零假设样本中，观测到的GRBs的角位置保持固定，而红移在每个银半球内被打乱。在北银半球，与武仙-北冕座长城相关的过密区在一系列椭球形状下仍保持显著，这支持了先前报道信号的稳定性，表明其并非仅使用球形计数体积的结果。在南银半球，相同方法未发现具有相当显著性的结构，存在一个小型候选成团体但显著性仅为边缘水平，且对少量事件敏感。我们得出结论，椭球重采样是对GRB过密区搜索的有用检验，但任何候选结构的物理本质仍需通过星系或类星体样本等独立示踪物确认。
英文摘要：
Gamma-ray bursts (GRBs) are bright transient sources that can be observed at high redshift. They can therefore be used as tracers of the distant large-scale structure, although the GRB redshift sample is sparse and affected by strong selection effects. We analyze the three-dimensional distribution of 542 GRBs with spectroscopic redshifts. The method extends our earlier spherical-window search by replacing spherical counting volumes with axisymmetric spheroids. The angular positions of the observed GRBs are kept fixed in the Monte-Carlo null samples, while the redshifts are shuffled within each Galactic hemisphere. In the Northern Galactic hemisphere, the overdensity associated with the Hercules--Corona Borealis Great Wall remains significant for a range of spheroidal shapes. This supports the stability of the previously reported signal and shows that it is not only a consequence of using spherical counting volumes. In the Southern Galactic hemisphere, the same method finds no structure with comparable significance. A small candidate grouping is present, but its significance is only marginal, and it is sensitive to the small number of events. We conclude that spheroidal resampling is a useful check of GRB overdensity searches, but the physical nature of any candidate structure still requires confirmation with independent tracers such as galaxy or quasar samples.
