On the Evidence for a Common-spectrum Process in the Search for the Nanohertz Gravitational-wave Background with the Parkes Pulsar Timing Array
文献类型：期刊论文
| 作者 | Goncharov,Boris18,19,20; Shannon,R. M.19,20; Reardon,D. J.19,20; Hobbs,G.17; Zic,A.16,17; Bailes,M.19,20; Cury?o,M.15; Dai,S.14,17; Kerr,M.13; Lower,M. E.17,20 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021-08-01 |
| 卷号 | 917期号:2 |
| 关键词 | Gravitational waves Gravitational wave astronomy Millisecond pulsars Pulsar timing method Bayesian statistics |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ac17f4 |
| 通讯作者 | Goncharov,Boris() |
| 英文摘要 | 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. |
| 语种 | 英语 |
| WOS记录号 | IOP:2041-8205-917-2-AC17F4 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4231]  |
| 专题 | 脉冲星研究团组 新疆天文台_射电天文研究室 |
| 通讯作者 | Goncharov,Boris |
| 作者单位 | 1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic Of China 2.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100101, People's Republic Of China 3.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, Xinjiang 830011, People's Republic of China 4.Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK 5.CSIRO Space and Astronomy, Australia Telescope National Facility, P.O. Box 276, Parkes, NSW 2870 Australia 6.CSIRO Scientific Computing, Australian Technology Park, Locked Bag 9013, Alexandria, NSW 1435, Australia 7.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China 8.School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 9.CAS Key Laboratory of Theoretical Physics, Insitute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China 10.School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia |
| 推荐引用方式 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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