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, Boris2; Shannon, R. M.; Reardon, D. J.; Hobbs, G.; Zic, A.; Bailes, M.; Curylo, M.; Dai, S.; Kerr, M.; Lower, M. E. |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2021 |
| 卷号 | 917期号:2页码:L19 |
| 关键词 | LIMITS SIGNAL NOISE |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ac17f4 |
| 英文摘要 | 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) x 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. |
| 学科主题 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/27423]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 作者单位 | 1.[Goncharov, Boris; Shannon, R. M.; Reardon, D. J.; Bailes, M.; Lower, M. E.; Mandow, R.; Middleton, H.; Miles, M. T.; Cameron, A. D.; Spiewak, R.] Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia 2.Goncharov, Boris; Shannon, R. M.; Reardon, D. J.; Bailes, M.; Middleton, H.; Miles, M. T.; Thrane, E.; Zhu, X. -J.; Cameron, A. D.] OzGrav ARC Ctr Excellence Gravitat Wave Discovery, Hawthorn, Vic, Australia 3.Gran Sasso Sci Inst GSSI, I-67100 Laquila, Italy 4.Hobbs, G.; Zic, A.; Dai, S.; Lower, M. E.; Manchester, R. N.; Mandow, R.; Thyagarajan, N.; Luo, R.; Wang, S.] CSIRO, Australia Telescope Natl Facil, Space & Astron, POB 76, Epping, NSW 1710, Australia 5.Zic, A.] Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia 6.Zic, A.] Macquarie Univ, Ctr Astron Astrophys & Astrophoton, N Ryde, NSW 2109, Australia 7.Curylo, M.] Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland 8.Dai, S.] Western Sydney Univ, Locked Bag 1797, Penrith, NSW 1797, Australia 9.Kerr, M.] Naval Res Lab, Space Sci Div, Washington, DC 20375 USA 10.Middleton, H.] Univ Melbourne, Sch Phys, Parkville, Vic 3010, 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]. ASTROPHYSICAL JOURNAL LETTERS,2021,917(2):L19. |
| 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.ASTROPHYSICAL JOURNAL LETTERS,917(2),L19. |
| 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".ASTROPHYSICAL JOURNAL LETTERS 917.2(2021):L19. |
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来源：理论物理研究所
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