论文标题
在短伽玛射线爆发种群中寻找中子星 - 黑孔二进制合并
A Search for Neutron Star-Black Hole Binary Mergers in the Short Gamma-Ray Burst Population
论文作者
论文摘要
短伽马射线爆发（SGRB）现在已知是两个紧凑物体合并的乘积。但是，存在两个可能的地层通道：中子星 - 中子星（NS -NS）或NS-黑洞（BH）。具有里程碑意义的SGRB 170817A，得益于对其重力波信号的分析，NS -NS通道提供了证据。我们研究了具有相关红移（39个事件）的SGRB的完整人群，并搜索可能表明NS的任何部门 - BH形成渠道也会贡献。尽管未发现结论性的二分法，但我们发现有几条证据暂定支持以下假设：延长发射的SGRB（EE； 7个事件）构成了缺失的合并人群：它们在其持续时间的较大能量带敏感性中是独一无二的，并且在统计上具有独特的能量和宿主的星系外偏移（与普通的（非正规）（非EEE）相比）。如果通过未来的引力检测来证实这一点，它将最终反驳SGRB的磁铁模型。此外，我们确定了宿主星系中SGRB的偏移量与迅速发射能之间的第一个统计学上显着的抗相关性。
Short gamma-ray bursts (SGRBs) are now known to be the product of the merger of two compact objects. However, two possible formation channels exist: neutron star -- neutron star (NS -- NS) or NS -- black hole (BH). The landmark SGRB 170817A provided evidence for the NS -- NS channel, thanks to analysis of its gravitational wave signal. We investigate the complete population of SGRBs with an associated redshift (39 events), and search for any divisions that may indicate that a NS -- BH formation channel also contributes. Though no conclusive dichotomy is found, we find several lines of evidence that tentatively support the hypothesis that SGRBs with extended emission (EE; 7 events) constitute the missing merger population: they are unique in the large energy band-sensitivity of their durations, and have statistically distinct energies and host galaxy offsets when compared to regular (non-EE) SGRBs. If this is borne out via future gravitational wave detections it will conclusively disprove the magnetar model for SGRBs. Furthermore, we identify the first statistically significant anti-correlation between the offsets of SGRBs from their host galaxies and their prompt emission energies.
