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

作     者：Yan-Chen Bi Yu-Mei Wu Zu-Cheng Chen Qing-Guo Huang Yan-Chen Bi;Yu-Mei Wu;Zu-Cheng Chen;Qing-Guo Huang

作者机构：CAS Key Laboratory of Theoretical PhysicsInstitute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China School of Fundamental Physics and Mathematical SciencesHangzhou Institute for Advanced StudyUCASHangzhou 310024China Department of AstronomyBeijing Normal UniversityBeijing 100875China Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhai 519087China Department of Physics and Synergistic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2023年第66卷第12期

页      面：3-10页

核心收录：

学科分类：12[管理学] 0711[理学-系统科学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 07[理学] 070401[理学-天体物理] 0704[理学-天文学] 0811[工学-控制科学与工程] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12250010,11975019,11991052,and 12047503) the Key Research Program of Frontier Sciences,CAS(Grant No.ZDBS-LY-7009) the CAS Project for Young Scientists in Basic Research(Grant No.YSBR-006) the Key Research Program of the Chinese Academy of Sciences(Grant No.XDPB15) supported by the National Natural Science Foundation of China(Grant Nos.12247176,and 12247112) the China Postdoctoral Science Foundation Fellowship(Grant No.2022M710429)。 

主　　题：supermassive black hole binary gravitational wave pulsar timing array 

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 Tian Qin in the near future.