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| On the Evidence for a Common-spectrum Process in the Search for the Nanohertz Gravitational-wave Background with the Parkes Pulsar Timing Array | |
Goncharov,Boris1,2,3; Shannon,R. M.1,2; Reardon,D. J.1,2; Hobbs,G.4; Zic,A.4,5; Bailes,M.1,2; Cury?o,M.6; Dai,S.4,7; Kerr,M.8; Lower,M. E.1,4; Manchester,R. N.4; Mandow,R.1,4; Middleton,H.1,2,9; Miles,M. T.1,2; Parthasarathy,A.10; Thrane,E.2,11; Thyagarajan,N.4; Xue,X.12,13; Zhu,X.-J.2,11; Cameron,A. D.1,2; Feng,Y.14; Luo,R.4; Russell,C. J.15; Sarkissian,J.16; Spiewak,R.1,17; Wang,S.4,18 ; Wang,J. B.18; Zhang,L.19; Zhang,S.20
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| 2021-08-01 | |
| Source Publication | The Astrophysical Journal Letters
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| ISSN | 2041-8205 |
| Volume | 917Issue:2 |
| Abstract | Abstract A nanohertz-frequency stochastic gravitational-wave background can potentially be detected through the precise timing of an array of millisecond pulsars. This background produces low-frequency noise in the pulse arrival times that would have a characteristic spectrum common to all pulsars and a well-defined spatial correlation. Recently the North American Nanohertz Observatory for Gravitational Waves collaboration (NANOGrav) found evidence for the common-spectrum component in their 12.5 yr data set. Here we report on a search for the background using the second data release of the Parkes Pulsar Timing Array. If we are forced to choose between the two NANOGrav models—one with a common-spectrum process and one without—we find strong support for the common-spectrum process. However, in this paper, we consider the possibility that the analysis suffers from model misspecification. In particular, we present simulated data sets that contain noise with distinctive spectra but show strong evidence for a common-spectrum process under the standard assumptions. The Parkes data show no significant evidence for, or against, the spatially correlated Hellings–Downs signature of the gravitational-wave background. Assuming we did observe the process underlying the spatially uncorrelated component of the background, we infer its amplitude to be A = 2.2 ? 0.3 + 0.4 × 10 ? 15 in units of gravitational-wave strain at a frequency of 1 yr?1. Extensions and combinations of existing and new data sets will improve the prospects of identifying spatial correlations that are necessary to claim a detection of the gravitational-wave background. |
| Corresponding Author | Goncharov,Boris() |
| Keyword | Gravitational waves Gravitational wave astronomy Millisecond pulsars Pulsar timing method Bayesian statistics |
| DOI | 10.3847/2041-8213/ac17f4 |
| Language | 英语 |
| WOS ID | IOP:2041-8205-917-2-ac17f4 |
| Publisher | The American Astronomical Society |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/4232 |
| Collection | 射电天文研究室_脉冲星研究团组 射电天文研究室 |
| Corresponding Author | Goncharov,Boris |
| Affiliation | 1.Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia; boris.goncharov@me.com 2.OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery, Australia 3.Gran Sasso Science Institute (GSSI), I-67100 L’Aquila, Italy 4.Australia Telescope National Facility, CSIRO, Space and Astronomy, P.O. Box 76, Epping, NSW 1710, Australia 5.Department of Physics and Astronomy, and Research Centre in Astronomy, Astrophysics and Astrophotonics, Macquarie University, NSW 2109, Australia 6.Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw, Poland 7.Western Sydney University, Locked Bag 1797, Penrith South DC, NSW 1797, Australia 8.Space Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USA 9.School of Physics, University of Melbourne, Parkville, VIC 3010, Australia 10.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany 11.School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia 12.CAS Key Laboratory of Theoretical Physics, Insitute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China 13.School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 14.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China 15.CSIRO Scientific Computing, Australian Technology Park, Locked Bag 9013, Alexandria, NSW 1435, Australia 16.CSIRO Space and Astronomy, Australia Telescope National Facility, P.O. Box 276, Parkes, NSW 2870 Australia 17.Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK 18.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, Xinjiang 830011, People's Republic of China 19.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100101, People's Republic Of China 20.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic Of China |
| Recommended Citation GB/T 7714 | Goncharov,Boris,Shannon,R. M.,Reardon,D. J.,et al. On the Evidence for a Common-spectrum Process in the Search for the Nanohertz Gravitational-wave Background with the Parkes Pulsar Timing Array[J]. The Astrophysical Journal Letters,2021,917(2). |
| APA | Goncharov,Boris.,Shannon,R. M..,Reardon,D. J..,Hobbs,G..,Zic,A..,...&Zhang,S..(2021).On the Evidence for a Common-spectrum Process in the Search for the Nanohertz Gravitational-wave Background with the Parkes Pulsar Timing Array.The Astrophysical Journal Letters,917(2). |
| MLA | Goncharov,Boris,et al."On the Evidence for a Common-spectrum Process in the Search for the Nanohertz Gravitational-wave Background with the Parkes Pulsar Timing Array".The Astrophysical Journal Letters 917.2(2021). |
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