Constraints on population I/II neutron star-black hole binary formation by gravitational wave and radio observations
Constraints on population I/II neutron star-black hole binary formation by gravitational wave and radio observations
复制标题
引力波和射电观测对 I/II 族中子星-黑洞双星形成的约束
DOI：
10.1093/mnrasl/slac073
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发表时间：
2022
影响因子：
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通讯作者：
Nakano Hiroyuki
中科院分区：
文献类型：
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作者：
Kinugawa Tomoya;Nakamura Takashi;Nakano Hiroyuki
在LIGO/Virgo O3b运行中发现的两个中子星(NS)-黑洞（BH）双星GW200105和GW200115的黑洞质量较小，为6-9 M⊙，这与星族I和星族II的起源一致。我们对106个星族I和星族II双星进行了星族合成模拟，并设置了适当的初始参数，结果显示，到目前为止，我们银河系中没有发现射电脉冲星（PSR）和黑洞双星，它们的质量、事件率都是一致的。特别地，我们发现了GW200105和GW200115可能的祖星，它们分别形成于红移系数= 0.15和z= 1.6，二元质量为and。这两颗双星的最终质量分别是GW200105和GW200115。我们还估计银河系中2.68-19.7个PSR-BH双星将被SKA观测到。在未来的SKA时代，我们银河系中存在的NS-BHs可以得到证实。通过对NS-BH合并的GW观测和未来对psr - bh的射电观测，我们可以得到对NS-BH形成过程更严格的约束。
Two neutron star (NS)-black hole (BH) binaries, GW200105 and GW200115 found in the LIGO/Virgo O3b run have smaller BH mass of 6–9 M⊙, which is consistent with Population I and II origin. Our population synthesis simulations using 106Population I and II binaries with appropriate initial parameters show consistent binary mass, event rate, no detection of radio pulsar (PSR), and BH binaries in our Galaxy so far. Especially, we found possible progenitors of GW200105 and GW200115, which were formed at redshiftz= 0.15 andz= 1.6 with binary mass ofand, respectively. The final masses of these binaries areandwhich look likeof GW200105 andof GW200115, respectively. We also estimate that 2.68–19.7 PSR–BH binaries in our Galaxy will be observed by SKA. The existence of NS–BHs in our Galaxy can be confirmed in future SKA era. Using the GW observation of NS–BH mergers and the radio observation of PSR–BHs in future, we can get more severe constraints on the NS–BH formation process.