XAO OpenIR  > 射电天文研究室  > 脉冲星研究团组
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
2021-08-01
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume917Issue:2
AbstractAbstract 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 AuthorGoncharov,Boris()
KeywordGravitational waves Gravitational wave astronomy Millisecond pulsars Pulsar timing method Bayesian statistics
DOI10.3847/2041-8213/ac17f4
Language英语
WOS IDIOP:2041-8205-917-2-ac17f4
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://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 AuthorGoncharov,Boris
Affiliation1.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).
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Goncharov,Boris]'s Articles
[Shannon,R. M.]'s Articles
[Reardon,D. J.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Goncharov,Boris]'s Articles
[Shannon,R. M.]'s Articles
[Reardon,D. J.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Goncharov,Boris]'s Articles
[Shannon,R. M.]'s Articles
[Reardon,D. J.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.