论文标题
四个偏心合并增加了Ligo-Virgo- Kagra的二进制黑洞的证据
Four eccentric mergers increase the evidence that LIGO--Virgo--KAGRA's binary black holes form dynamically
论文作者
论文摘要
通过重力波检测到的紧凑型二元合并的数量不断增长，其中包含多个事件，这些事件是通过孤立的二元进化来解释的具有挑战性的事件。这些事件的质量比孤立的二进制文件，未对准的分量旋转角度和/或不可忽略的轨道偏心率更高。我们研究了Ligo-Virgo-Kagra与一排列的旋转，中等份量波形模型的Ligo-Virgo-Kagra合作的第三个重力波瞬态目录的62个二元黑洞候选物的轨道偏心率。在此框架内，我们发现，其中至少四个事件对偏心率$ e_ {10} \ geq 0.1 $在重力波频率下为$ 10 $ 〜Hz（$> 60 \％$可信度），在log-Suormiformence contrifity of log-surom-Scrounciential tht the rangans ranges $ 10^{ - 4} <e_ {10} <0.2 $ {10} <0.2 $）。其中两个事件是人口的新增加：GW191109和GW200208 \ _22。如果四个怪异的候选者确实是偏心的，我们的结果表明，人口稠密的恒星簇可能会产生100 \％的观察到的合并。但是，其他具有较高偏心合并产量（例如，主动银河核）的形成环境也可能仍然有助于。 We estimate that we will be able to confidently distinguish which formation channel dominates the eccentric merger rate after $\gtrsim 80$ detections of events with $e_{10} \geq 0.05$ at LIGO--Virgo sensitivity, with only $\sim 5$ detectably-eccentric events required to distinguish formation channels with third-generation gravitational-wave detectors.
The growing population of compact binary mergers detected with gravitational waves contains multiple events that are challenging to explain through isolated binary evolution. Such events have higher masses than are expected in isolated binaries, component spin-tilt angles that are misaligned, and/or non-negligible orbital eccentricities. We investigate the orbital eccentricities of 62 binary black hole candidates from the third gravitational-wave transient catalogue of the LIGO-Virgo-KAGRA Collaboration with an aligned-spin, moderate-eccentricity waveform model. Within this framework, we find that at least four of these events show significant support for eccentricity $e_{10} \geq 0.1$ at a gravitational-wave frequency of $10$~Hz ($> 60\%$ credibility, under a log-uniform eccentricity prior that spans the range $10^{-4} < e_{10} < 0.2$). Two of these events are new additions to the population: GW191109 and GW200208\_22. If the four eccentric candidates are truly eccentric, our results suggest that densely-populated star clusters may produce 100\% of the observed mergers. However, it remains likely that other formation environments with higher yields of eccentric mergers -- for example, active galactic nuclei -- also contribute. We estimate that we will be able to confidently distinguish which formation channel dominates the eccentric merger rate after $\gtrsim 80$ detections of events with $e_{10} \geq 0.05$ at LIGO--Virgo sensitivity, with only $\sim 5$ detectably-eccentric events required to distinguish formation channels with third-generation gravitational-wave detectors.
