The possible existence of Pop III NS-BH binary and its detectability

The possible existence of Pop III NS-BH binary and its detectability
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Pop III NS-BH 二进制文件的可能存在及其可检测性

DOI:
10.1093/ptep/ptx003
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发表时间:
2017
影响因子:
3.5
通讯作者:
T.Nakamura and H.Nakano
T.Nakamura and H.Nakano
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
T.Kinugawa;T.Nakamura and H.Nakano

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在PopIII星的星族合成模拟中,形成了许多合并时间小于宇宙年龄的BH(黑洞)-BH双星,而没有NS(中子星星)-BH双星。原因是Pop III星没有金属,所以预计不会有质量损失。然后,在最后一次超新星爆炸到NS时,大量的质量丢失,使得半长轴变得太大,以至于Pop III NS-BH双星无法合并。然而,从对脉冲星自行的观测中,几乎可以确定NS存在量级的反冲速度。因此,NS-BH双星的一半的半长轴可以小于之前的Pop III NS-BH双星的参数,以减少合并时间。我们进行人口合成的Monte Carlo模拟的Pop III NS-BH的二进制文件,包括踢的NS和发现的Pop III NS-BH合并率的事件率。这表明,从今年秋天开始,在Advanced LIGO和Advanced Virgo的O2(观测运行2)中有很好的机会检测到Pop III NS-BH合并。
In the population synthesis simulations of Pop III stars, many BH (black hole)-BH binaries with merger time less than the age of the Universeare formed, while NS (neutron star)-BH binaries are not. The reason is that Pop III stars have no metal so that no mass loss is expected. Then, in the final supernova explosion to NS, much mass is lost so that the semimajor axis becomes too large for Pop III NS-BH binaries to merge within. However it is almost established that the kick velocity of the order ofexists for NS from the observation of the proper motion of the pulsar. Therefore, the semimajor axis of the half of NS-BH binaries can be smaller than that of the previous argument for Pop III NS-BH binaries to decrease the merging time. We perform population synthesis Monte Carlo simulations of Pop III NS-BH binaries including the kick of NS and find that the event rate of Pop III NS-BH merger rate is. This suggests that there is a good chance of detecting Pop III NS-BH mergers in O2 (Observation run 2) of Advanced LIGO and Advanced Virgo from this autumn.
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