DOUBLE COMPACT OBJECTS. III. GRAVITATIONAL-WAVE DETECTION RATES
DOUBLE COMPACT OBJECTS. III. GRAVITATIONAL-WAVE DETECTION RATES
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DOI：
10.1088/0004-637x/806/2/263
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发表时间：
2015-06-20
影响因子：
4.9
通讯作者：
Pannarale, Francesco
中科院分区：
文献类型：
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作者：
Dominik, Michal;Berti, Emanuele;Pannarale, Francesco
史无前例的第二代引力波(GW)观测站的范围要求完善对潜在震源和探测率的预测。中子星-中子星(NS-NS)、黑洞-中子星(BH-NS)和黑洞-黑洞(BH-BH)双星致密天体(DCO)的结合是这些探测器最有希望的GWS来源。我们使用最新的宇宙学演化模型计算了第二代GW探测器中聚结DCO的探测率，并在我们的信噪比计算中实现了灵感-合并-环状引力波形模型。我们发现：(1)信号的合并/振铃部分的加入对NS-NS和BH-NS系统的速率没有显著影响，但它使BH-BH系统的速率提高了约1.5倍；(2)在我们几乎所有的模型中，BH-BH系统产生的速率最大，其次分别是NS-NS和BH-NS系统；以及(3)大多数可检测到的BH-BH系统是在早期宇宙中低金属丰度环境中形成的。我们对探测到的双星的分布进行了预测，并讨论了第一次GW探测将教会我们什么关于双星形成和演化的天体物理学。
The unprecedented range of second-generation gravitational-wave (GW) observatories calls for refining the predictions of potential sources and detection rates. The coalescence of double compact objects (DCOs)-i.e., neutron star-neutron star (NS-NS), black hole-neutron star (BH-NS), and black hole-black hole (BH-BH) binary systems-is the most promising source of GWs for these detectors. We compute detection rates of coalescing DCOs in second-generation GW detectors using the latest models for their cosmological evolution, and implementing inspiral-merger-ringdown gravitational waveform models in our signal-to-noise ratio calculations. We find that (1) the inclusion of the merger/ringdown portion of the signal does not significantly affect rates for NS-NS and BH-NS systems, but it boosts rates by a factor of similar to 1.5 for BH-BH systems; (2) in almost all of our models BH-BH systems yield by far the largest rates, followed by NS-NS and BH-NS systems, respectively; and (3) a majority of the detectable BH-BH systems were formed in the early universe in low-metallicity environments. We make predictions for the distributions of detected binaries and discuss what the first GW detections will teach us about the astrophysics underlying binary formation and evolution.