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| Identifying and mitigating noise sources in precision pulsar timing data sets | |
Goncharov, B.1,2; Reardon, D. J.2,3; Shannon, R. M.2,3; Zhu, X. J.1,2; Thrane, E.1,2; Bailes, M.2,3; Bhat, N. D. R.4; Dai, S.5; Hobbs, G.2,5; Kerr, M.6; Manchester, R. N.5; Oslowski, S.2,3; Parthasarathy, A.2,3,7; Russell, C. J.8; Spiewak, R.2,3; Thyagarajan, N.9; Wang, J. B.10
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| 2021-03-01 | |
| Source Publication | Monthly Notices of the Royal Astronomical Society
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| ISSN | 0035-8711 |
| Volume | 502Issue:1Pages:478-493 |
| Contribution Rank | 10 |
| Abstract | Pulsar timing array projects measure the pulse arrival times of millisecond pulsars for the primary purpose of detecting nanohertz-frequency gravitational waves. The measurements include contributions from a number of astrophysical and instrumental processes, which can either be deterministic or stochastic. It is necessary to develop robust statistical and physical models for these noise processes because incorrect models diminish sensitivity and may cause a spurious gravitational wave detection. Here we characterize noise processes for the 26 pulsars in the second data release of the Parkes Pulsar Timing Array using Bayesian inference. In addition to well-studied noise sources found previously in pulsar timing array data sets such as achromatic timing noise and dispersion measure variations, we identify new noise sources including time-correlated chromatic noise that we attribute to variations in pulse scattering. We also identify 'exponential dip' events in four pulsars, which we attribute to magnetospheric effects as evidenced by pulse profile shape changes observed for three of the pulsars. This includes an event in PSR J1713+0747, which had previously been attributed to interstellar propagation. We present noise models to be used in searches for gravitational waves. We outline a robust methodology to evaluate the performance of noise models and identify unknown signals in the data. The detection of variations in pulse profiles highlights the need to develop efficient profile domain timing methods. |
| Keyword | gravitational waves methods: data analysis pulsars: general millisecond pulsar time Astronomy & Astrophysics |
| Subtype | Article |
| DOI | 10.1093/mnras/staa3411 |
| URL | 查看原文 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000649423200034 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/4711 |
| Collection | 射电天文研究室_脉冲星研究团组 |
| Affiliation | 1.School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia; 2.Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav); 3.Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; 4.International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia; 5.CSIRO Astronomy and Space Science, Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia; 6.Space Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USA; 7.Max-Planck-Institut fur Radioastronomie, Auf dem H¨uugel 69, D-53121 Bonn, Germany; 8.CSIRO Scientific Computing, Australian Technology Park, Locked Bag 9013, Alexandria, NSW 1435, Australia; 9.National Radio Astronomy Observatory, 1003 Lopezville Rd, Socorro, NM 87801, USA; 10.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, Xinjiang 830011, China |
| Recommended Citation GB/T 7714 | Goncharov, B.,Reardon, D. J.,Shannon, R. M.,et al. Identifying and mitigating noise sources in precision pulsar timing data sets[J]. Monthly Notices of the Royal Astronomical Society,2021,502(1):478-493. |
| APA | Goncharov, B..,Reardon, D. J..,Shannon, R. M..,Zhu, X. J..,Thrane, E..,...&Wang, J. B..(2021).Identifying and mitigating noise sources in precision pulsar timing data sets.Monthly Notices of the Royal Astronomical Society,502(1),478-493. |
| MLA | Goncharov, B.,et al."Identifying and mitigating noise sources in precision pulsar timing data sets".Monthly Notices of the Royal Astronomical Society 502.1(2021):478-493. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Goncharov-2021-Ident（4380KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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