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arXiv 2307.01427astro-ph.HEastro-ph.CO
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动力学相互作用产生的恒星双黑洞并合强引力透镜事件率

Event Rate of Strongly Lensed Gravitational Waves of Stellar Binary Black Hole Mergers Produced by Dynamical Interactions

Zhiwei Chen

AI总结:

本文通过蒙特卡洛模拟估算动力学通道产生的恒星双黑洞并合强引力透镜事件率,发现其约为EMBS通道的2倍,并提出可通过统计比较透镜化事件数来约束两种形成通道的比例。

摘要:

恒星双黑洞(sBBH)并合产生的引力波可被前景星系引力透镜化,并被未来地面探测器探测到。大量工作已投入到源自大质量双星演化(EMBS通道)的透镜化sBBH探测率估计中。然而,在致密星团中通过动力学相互作用产生的sBBH(动力学通道)也可能在宇宙中占主导地位,其物理性质的内禀分布可能与大质量恒星产生的sBBH显著不同,尤其是质量和红移分布。本文通过蒙特卡洛模拟研究了动力学通道产生的透镜化sBBH事件率,对于爱因斯坦望远镜,事件数为$16_{-12}^{+4.7}$ $\rm yr^{-1}$;对于宇宙探索者,事件数为$24_{-17}^{+6.8}$ $\rm yr^{-1}$,其中位数约为源自EMBS通道的sBBH事件率的$\sim 2$倍(由动力学通道和EMBS通道估计的本地并合率密度校准,分别为$\sim 14_{-10}^{+4.0}$和$19_{-3.0}^{+42} \rm Gpc^{-3}yr^{-1}$)。因此,通过统计比较预测与观测到的透镜化sBBH事件数,可以约束EMBS和动力学两个通道的占比。

英文摘要:

Gravitational waves emitted from stellar binary black hole (sBBH) mergers can be gravitationally lensed by intervening galaxies and detected by future ground-based detectors. A large amount of effort has been put into the estimation of the detection rate of lensed sBBH originating from the evolution of massive binary stars (EMBS channel). However, sBBHs produced by the dynamical interaction in dense clusters (dynamical channel) may also be dominant in our universe and their intrinsic distribution of physical properties can be significantly different from those produced by massive stars, especially mass and redshift distribution. In this paper, we investigate the event rate of lensed sBBHs produced via dynamical channel by Monte Carlo simulations and the number is $16_{-12}^{+4.7} $ $\rm yr^{-1}$ for the Einstein telescope and $24_{-17}^{+6.8}$ $ \rm yr^{-1}$ for Cosmic Explorer, of which the median is about $\sim 2$ times the rate of sBBHs originated from EMBS channel (calibrated by the local merger rate density estimated for the dynamical and the EMBS channel, i.e., $\sim 14_{-10}^{+4.0}$ and $19_{-3.0}^{+42} \rm Gpc^{-3}yr^{-1}$ respectively). Therefore, one may constrain the fraction of both EMBS and dynamical channels through the comparison of the predicted and observed number of lensed sBBH events statistically.

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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