Implications for the supermassive black hole binaries from the NANOGrav 15-year data set

被引：0
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作者：
Yan-Chen Bi
Yu-Mei Wu
Zu-Cheng Chen
Qing-Guo Huang
机构：
[1] Chinese Academy of Sciences,CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics
[2] University of Chinese Academy of Sciences,School of Physical Sciences
[3] UCAS,School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study
[4] Beijing Normal University,Department of Astronomy
[5] Beijing Normal University,Advanced Institute of Natural Sciences
[6] Hunan Normal University,Department of Physics and Synergistic Innovation Center for Quantum Effects and Applications
来源：
Science China Physics, Mechanics & Astronomy | 2023年 / 66卷
关键词：
supermassive black hole binary; gravitational wave; pulsar timing array;
D O I：
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中图分类号：
学科分类号：
摘要：
Several pulsar timing array (PTA) collaborations, including NANOGrav, EPTA, PPTA, and CPTA, have announced the evidence for a stochastic signal consistent with a stochastic gravitational wave background (SGWB). Supermassive black hole binaries (SMBHBs) are supposed to be the most promising gravitational-wave (GW) sources for this signal. In this paper, we use the NANOGrav 15-year data set to constrain the parameter space in an astro-informed formation model for SMBHBs. Our results prefer a large turn-over eccentricity of the SMBHB orbit when GWs begin to dominate the SMBHB evolution. Furthermore, the SGWB spectrum is extrapolated to the space-borne GW detector frequency band by including inspiral-merge-cutoff phases of SMBHBs, indicating that the SGWB from SMBHBs should be detected by LISA, Taiji and TianQin in the near future.
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