One Channel to Rule Them All? Constraining the Origins of Binary Black Holes Using Multiple Formation Pathways
One Channel to Rule Them All? Constraining the Origins of Binary Black Holes Using Multiple Formation Pathways
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DOI：
10.3847/1538-4357/abe40e
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发表时间：
2020-11
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通讯作者：
M. Zevin;S. Bavera;C. Berry;V. Kalogera;T. Fragos;P. Marchant;C. Rodriguez;F. Antonini;D. Hol
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作者：
M. Zevin;S. Bavera;C. Berry;V. Kalogera;T. Fragos;P. Marchant;C. Rodriguez;F. Antonini;D. Hol
第二个LIGO-Virgo引力波（GW）瞬变目录使双黑洞的观测样本增加了四倍多。我们使用一套五个最先进的二元黑洞种群模型来分析这个目录，这些模型涵盖了一系列孤立的动态形成通道，并推断通道之间的分支分数以及对影响合并观测特性的不确定物理过程的约束。考虑到我们的一组形成模型，我们发现基础和可检测的种群的分支分数之间存在显着差异，检测的多样性表明多个形成通道在起作用。通道的混合比任何单一通道占主导地位的检测人口强烈首选：一个单独的通道不会贡献超过70%的观测样本的双黑洞。在我们的模型中，我们计算了纳塔尔自旋假设和公共包络效率之间的偏好，有利于孤立黑洞的纳塔尔自旋为0.01，稍微倾向于公共包络效率为0.02，而强烈反对效率极低的公共包络。我们表明，这是必要的，以考虑多个渠道时，解释GW目录，作为推理的分支分数和物理处方变得有偏见时，不考虑或不正确的物理处方的情况下作出贡献的形成。虽然我们的定量结果可能会受到模型预测中不确定假设的影响，但我们的方法能够包括具有更新理论考虑和额外形成通道的模型。
The second LIGO–Virgo catalog of gravitational-wave (GW) transients has more than quadrupled the observational sample of binary black holes. We analyze this catalog using a suite of five state-of-the-art binary black hole population models covering a range of isolated and dynamical formation channels and infer branching fractions between channels as well as constraints on uncertain physical processes that impact the observational properties of mergers. Given our set of formation models, we find significant differences between the branching fractions of the underlying and detectable populations, and the diversity of detections suggests that multiple formation channels are at play. A mixture of channels is strongly preferred over any single channel dominating the detected population: an individual channel does not contribute to more than ≃70% of the observational sample of binary black holes. We calculate the preference between the natal spin assumptions and common-envelope efficiencies in our models, favoring natal spins of isolated black holes of ≲0.1 and marginally preferring common-envelope efficiencies of ≳2.0 while strongly disfavoring highly inefficient common envelopes. We show that it is essential to consider multiple channels when interpreting GW catalogs, as inference on branching fractions and physical prescriptions becomes biased when contributing formation scenarios are not considered or incorrect physical prescriptions are assumed. Although our quantitative results can be affected by uncertain assumptions in model predictions, our methodology is capable of including models with updated theoretical considerations and additional formation channels.