当前位置: X-MOL 学术Astrophys. J.  › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A Search for Neutron Star–Black Hole Binary Mergers in the Short Gamma-Ray Burst Population
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2020-05-26 , DOI: 10.3847/1538-4357/ab8d24
B. P. Gompertz 1 , A. J. Levan 1, 2 , N. R. Tanvir 3
Affiliation  

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.

中文翻译:

在短伽马射线暴群中寻找中子星-黑洞二元合并

现在已知短伽马射线暴 (SGRB) 是两个致密天体合并的产物。然而,存在两种可能的形成通道:中子星——中子星(NS——NS)或NS——黑洞(BH)。由于对其引力波信号的分析,具有里程碑意义的短暴 170817A 为 NS-NS 通道提供了证据。我们调查了具有相关红移的短暴的完整种群(39 个事件),并寻找任何可能表明 NS - BH 形成通道也有贡献的分裂。虽然没有发现决定性的二分法,但我们发现了几条证据,暂时支持具有扩展发射的短暴(EE;7 个事件)构成缺失合并种群的假设:它们在持续时间的大能带敏感性方面是独一无二的,与常规(非 EE)短暴相比,具有统计上不同的能量和宿主星系偏移。如果这通过未来的引力波探测得到证实,它将最终推翻短暴的磁星模型。此外,我们确定了短暴与其宿主星系的偏移量与其瞬时发射能量之间的第一个统计上显着的反相关性。
更新日期:2020-05-26
down
wechat
bug