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arXiv 1709.08437astro-ph.HE
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如何通过引力波观测证实III星族的存在

How to confirm the existence of population III stars by observations of gravitational waves

Akinobu Miyamoto, Tomoya Kinugawa, Takashi Nakamura, Nobuyuki Kanda

备注：
10 pages, 6 figures, published in Phys. Rev. D
发表信息：
Phys. Rev. D 96, 064025 (2017)
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摘要：

提出了一种利用引力波（GW）观测确认具有大质量黑洞双星（GW 150914）的第三星族（Pop III）星存在的方法。当我们得到足够数量的事件时，我们想确定哪个模型更接近现实，有没有Pop III明星。我们需要准备各种“Pop I/II模型”和各种“Pop I/II/III模型”，并调查哪种模型与事件一致。为了证明我们的分析，我们模拟检测GW事件的人口合成模型的一些例子，有和没有流行III星。我们计算的似然比与现实的事件数和评估的概率，确定存在的流行III星。在典型情况下，我们的分析可以通过黑洞-黑洞二元合并的22 GW信号以90%的概率区分Pop I/II模型和Pop I/II/III模型。

英文摘要：

We propose a method for confirmation of the existence of Population III (Pop III) stars with massive black hole binaries as GW150914 in gravitational wave (GW) observation. When we get enough number of events, we want to determine which model is closer to reality, with and without Pop III stars. We need to prepare various "Pop I/II models" and various "Pop I/II/III models" and investigate which model is consistent with the events. To demonstrate our analysis, we simulate detections of GW events for some examples of population synthesis models with and without Pop III stars. We calculate the likelihood ratio with the realistic number of events and evaluate the probability of identifying the existence of Pop III stars. In typical cases, our analysis can distinguish between Pop I/II model and Pop I/II/III model with 90% probability by 22 GW signals from black hole-black hole binary mergers.

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