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arXiv 1405.7016astro-ph.HEgr-qc
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双紧天体III:引力波探测率

Double Compact Objects III: Gravitational Wave Detection Rates

M. Dominik, E. Berti, R. O'Shaughnessy, I. Mandel, K. Belczynski, C. Fryer, D. Holz, T. Bulik, F. Pannarale

摘要:

第二代引力波(GW)观测站的范围前所未有,需要改进对潜在源和检测率的预测。双致密天体(DCOs)的聚并--即,中子星-中子星(NS-NS)、黑洞-中子星(BH-NS)和黑洞-黑洞(BH-BH)双星系统是这些探测器最有希望的引力波源。我们使用最新的宇宙学演化模型计算第二代GW探测器中合并DCO的探测率,并在我们的信噪比计算中实施inspiral-merge-ringdown(IMR)引力波形模型。我们发现:(1)信号的合并/振铃部分的包括对NS-NS和BH-NS系统的速率没有显著影响,但它使BH-BH系统的速率提高了一个因子$\sim 1.5$;(2)在我们的几乎所有模型中,BH-BH系统产生最大的速率,其次分别是NS-NS和BH-NS系统,(3)大多数可探测的BH-BH系统形成于宇宙早期的低金属丰度环境。我们预测检测到的双星的分布,并讨论了什么样的第一GW检测将教我们有关的天体物理学基础的二进制的形成和演化。

英文摘要:

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 (IMR) 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 $\sim 1.5$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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