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The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background

文献类型：期刊论文

作者Antoniadis, J.75,76,77; Arzoumanian, Z.1; Babak, S.73,74; Bailes, M.71,72; Nielsen, A. S. B.70,76; Baker, P. T.69; Bassa, C. G.68; Becsy, B.67; Berthereau, A.65,66; Bonetti, M.63,64
刊名Monthly Notices of the Royal Astronomical Society
出版日期2022
卷号510期号:4页码:4873-4887
ISSN号0035-8711
关键词gravitational waves methods: data analysis pulsars: general data set limits common-spectrum process black-hole binaries millisecond pulsars solar-system spin noise astrophysics radiation signal time Astronomy & Astrophysics
DOI10.1093/mnras/stab3418
产权排序75
文献子类Article
英文摘要We searched for an isotropic stochastic gravitational wave background in the second data release of the International Pulsar Timing Array, a global collaboration synthesizing decadal-length pulsar-timing campaigns in North America, Europe, and Australia. In our reference search for a power-law strain spectrum of the form h(c) = A(f/1 yr(-1))(alpha), we found strong evidence for a spectrally similar low-frequency stochastic process of amplitude A = 3.8(-2.5)(+6.3) x 10(-15) and spectral index alpha = -0.5 +/- 0.5, where the uncertainties represent 95 per cent credible regions, using information from the auto- and cross-correlation terms between the pulsars in the array. For a spectral index of alpha = -2/3, as expected from a population of inspiralling supermassive black hole binaries, the recovered amplitude is A = 2.8(-0.8)(+1.2) x 10(-15). None the less, no significant evidence of the Hellings-Downs correlations that would indicate a gravitational-wave origin was found. We also analysed the constituent data from the individual pulsar timing arrays in a consistent way, and clearly demonstrate that the combined international data set is more sensitive. Furthermore, we demonstrate that this combined data set produces comparable constraints to recent single-array data sets which have more data than the constituent parts of the combination. Future international data releases will deliver increased sensitivity to gravitational wave radiation, and significantly increase the detection probability.
URL标识查看原文
语种英语
WOS记录号WOS:000764894000001
源URL[http://ir.xao.ac.cn/handle/45760611-7/5124]  
专题星系宇宙学研究团组
通讯作者Chen, S.
作者单位1.X-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA;
2.Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai 519087, P. R. China
3.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, P. R. China;
4.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, Xinjiang 830011, P. R. China;
5.Institute for Gravitational Wave Astronomy and School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;
6.Theoretical AstroPhysics Including Relativity (TAPIR), MC 350-17, Cali- fornia Institute of Technology, Pasadena, CA 91125, USA;
7.Laboratoire Univers et Th ´eories LUTh, Observatoire de Paris, Universit ´e PSL, CNRS, Universit ´e de Paris, F-92190 Meudon, France;
8.Department of Physics and Astronomy, Oberlin Colleg e , Oberlin, OH 44074, USA;
9.Department of Physics and Astronomy, Swarthmore Colleg e, Swarthmore , PA 19081, USA;
10.Department of Astrophysical and Planetary Sciences, University of Col- orado, Boulder, CO 80309, USA;
推荐引用方式
GB/T 7714		 Antoniadis, J.,Arzoumanian, Z.,Babak, S.,et al. The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background[J]. Monthly Notices of the Royal Astronomical Society,2022,510(4):4873-4887.
APA Antoniadis, J..,Arzoumanian, Z..,Babak, S..,Bailes, M..,Nielsen, A. S. B..,...&Zhu, X. J..(2022).The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background.Monthly Notices of the Royal Astronomical Society,510(4),4873-4887.
MLA Antoniadis, J.,et al."The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background".Monthly Notices of the Royal Astronomical Society 510.4(2022):4873-4887.

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