Searching for the Nano-Hertz Stochastic Gravitational Wave Background with the Chinese Pulsar Timing Array Data ReleaseⅠ

作     者：Heng Xu Siyuan Chen Yanjun Guo Jinchen Jiang Bojun Wang Jiangwei Xu Zihan Xue RNicolas Caballero Jianping Yuan Yonghua Xu Jingbo Wang Longfei Hao Jingtao Luo Kejia Lee Jinlin Han Peng Jiang Zhiqiang Shen Min Wang Na Wang Renxin Xu Xiangping Wu Richard Manchester Lei Qian Xin Guan Menglin Huang Chun Sun Yan Zhu Heng Xu;Siyuan Chen;Yanjun Guo;Jinchen Jiang;Bojun Wang;Jiangwei Xu;Zihan Xue;R.Nicolas Caballero;Jianping Yuan;Yonghua Xu;Jingbo Wang;Longfei Hao;Jingtao Luo;Kejia Lee;Jinlin Han;Peng Jiang;Zhiqiang Shen;Min Wang;Na Wang;Renxin Xu;Xiangping Wu;Richard Manchester;Lei Qian;Xin Guan;Menglin Huang;Chun Sun;Yan Zhu

作者机构：National Astronomical ObservatoryChinse Academy of SciencesBeijing 100101China Kavli Institute for Astronomy and AstrophysicsPeking UniversityBeijing 100871China Department of AstronomySchool of PhysicsPeking UniversityBeijing 100871China Max-Planck institut fúr RadioastronomieAuf Dem HúgelBonnD-53121Germany Hellenic Open UniversitySchool of Science and Technology26335 PatrasGreece Xinjiang Astronomical ObservatoryChinese Academy of SciencesUrumqi 830011China Yunnan Astronomical ObservatoriesChinese Academy of SciencesKunming 650216China Institute of Optoelectronic TechnologyLishui UniversityLishui 323000China National Time Service CenterChinese Academy Of SciencesXi'an 710600China Key Laboratory of Radio Astronomy and TechnologyChinese Academy of SciencesBeijing 100101China Beijing Laser Acceleration Innovation CenterHuairouBeijing 101400China Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China State Key Laboratory of Nuclear Physics and TechnologySchool of PhysicsPeking UniversityBeijing 100871China Australia Telescope National FacilityCSIRO Space and AstronomyP.O.Box 76Epping NSW 1710Australia 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2023年第23卷第7期

页      面：300-311页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0704[理学-天文学] 0825[工学-航空宇航科学与技术] 

基　　金：supported by the National SKA Program of China(2020SKA0120100) the National Natural Science Foundation of China(Nos.12041303 and 12250410246) the CAS-MPG LEGACY project funding from the Max-Planck Partner Group 

主　　题：(stars:)pulsars:general gravitational waves methods:statistical methods:observational 

摘      要：Observing and timing a group of millisecond pulsars with high rotational stability enables the direct detection of gravitational waves(GWs).The GW signals can be identified from the spatial correlations encoded in the times-of-arrival of widely spaced *** Chinese Pulsar Timing Array(CPTA)is a collaboration aiming at the direct GW detection with observations carried out using Chinese radio *** short article serves as a“table of contentsfor a forthcoming series of papers related to the CPTA Data Release 1(CPTA DR1)which uses observations from the Five-hundred-meter Aperture Spherical radio ***,after summarizing the time span and accuracy of CPTA DR1,we report the key results of our statistical inference finding a correlated signal with amplitude logA_(c)=-14.4_(-2.8)^(+1.0)for spectral index in the range ofα∈[-1.8,1.5]assuming a GW background(GWB)induced quadrupolar *** search for the Hellings–Downs(HD)correlation curve is also presented,where some evidence for the HD correlation has been found that a 4.6σstatistical significance is achieved using the discrete frequency method around the frequency of 14 n *** expect that the future International Pulsar Timing Array data analysis and the next CPTA data release will be more sensitive to the n Hz GWB,which could verify the current results.