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The Chinese Pulsar Timing Array Data Release I Single pulsar noise analysis

文献类型：期刊论文

作者Chen, Siyuan11,12; Xu, Heng10; Guo, Yanjun10,11; Wang, Bojun10; Caballero, R. Nicolas8,9; Jiang, Jinchen10; Xu, Jiangwei7,9,10; Xue, Zihan7,9,10; Lee, Kejia6,7,10,11; Yuan, Jianping5
刊名ASTRONOMY & ASTROPHYSICS
出版日期2025-07-07
卷号699
关键词gravitational waves methods: data analysis pulsars: general
ISSN号0004-6361
DOI10.1051/0004-6361/202452550
产权排序第9完成单位
文献子类Article
英文摘要The Chinese Pulsar Timing Array (CPTA) has collected observations from 57 millisecond pulsars using the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) for close to three years, for the purpose of searching for gravitational waves (GWs). To robustly search for ultra-low-frequency GWs, pulsar timing arrays (PTAs) need to use models to describe the noise from the individual pulsars. We report on the results from the single pulsar noise analysis of the CPTA data release I (DR1). Conventionally, power laws in the frequency domain are used to describe pulsar red noise and dispersion measurement (DM) variations over time. Employing Bayesian methods, we found the choice of number and range of frequency bins with the highest evidence for each pulsar individually. A comparison between a dataset using DM piecewise measured (DMX) values and a power-law Gaussian process to describe the DM variations shows strong Bayesian evidence in favour of the power-law model. Furthermore, we demonstrate that the constraints obtained from four independent software packages are very consistent with each other. The short time span of the CPTA DR1, paired with the large sensitivity of FAST, has proved to be a challenge for the conventional noise model using a power law. This mainly shows in the difficulty to separate different noise terms due to their covariances with each other. Nineteen pulsars are found to display covariances between the short-term white noise and long-term red and DM noise. With future CPTA datasets, we expect that the degeneracy can be broken. Finally, we compared the CPTA DR1 results against the noise properties found by other PTA collaborations. While we can see broad agreement, there is some tension between different PTA datasets for some of the overlapping pulsars. This could be due to the differences in the methods used to obtain the constraints or the different frequency range that is probed with the CPTA DR1, which probes a higher frequency range compared to the other PTAs.
学科主题天文学 ; 射电与天文学
URL标识查看原文
出版地17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
WOS关键词LIMITS
资助项目National SKA Program of China; FAST Key project; Chinese Academy of Sciences (NAOC); National Key Research and Development Program of China[2022YFC2205203]; National Natural Science Foundation of China[12041303]; National Natural Science Foundation of China[12250410246]; National Natural Science Foundation of China[12173087]; National Natural Science Foundation of China[12063003]; China Postdoctoral Science Foundation[2023M743518]; China Postdoctoral Science Foundation[2023M743516]; Major Science and Technology Program of Xinjiang Uygur Autonomous Region[2022A03013-4]; CAS-MPG LEGACY project; Max-Planck Partner Group; C*-SYSTEM of PSR@pku;[2020SKA0120100]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001523444300003
出版者EDP SCIENCES S A
资助机构National SKA Program of China ; FAST Key project ; Chinese Academy of Sciences (NAOC) ; National Key Research and Development Program of China[2022YFC2205203] ; National Natural Science Foundation of China[12041303, 12250410246, 12173087, 12063003] ; China Postdoctoral Science Foundation[2023M743518, 2023M743516] ; Major Science and Technology Program of Xinjiang Uygur Autonomous Region[2022A03013-4] ; CAS-MPG LEGACY project ; Max-Planck Partner Group ; C*-SYSTEM of PSR@pku ; [2020SKA0120100]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28427]  
专题云南天文台_射电天文研究组
通讯作者Chen, Siyuan; Xu, Heng; Guo, Yanjun
作者单位1.State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, PR China
2.National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, PR China;
3.Institute of Optoelectronic Technology, Lishui University, Lishui, Zhejiang 323000, PR China;
4.Yunnan Astronomical Observatories, Chinese Academy of Sciences, Kunming, 650216 Yunnan, PR China;
5.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, 830011 Xinjiang, PR China;
6.Beijing Laser Acceleration Innovation Center, Huairou, Beijing 101400, PR China;
7.Department of Astronomy, School of Physics, Peking University, Beijing 100871, PR China;
8.Hellenic Open University, School of Science and Technology, 26335 Patras, Greece;
9.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, PR China;
10.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, PR China;
推荐引用方式
GB/T 7714		 Chen, Siyuan,Xu, Heng,Guo, Yanjun,et al. The Chinese Pulsar Timing Array Data Release I Single pulsar noise analysis[J]. ASTRONOMY & ASTROPHYSICS,2025,699.
APA Chen, Siyuan.,Xu, Heng.,Guo, Yanjun.,Wang, Bojun.,Caballero, R. Nicolas.,...&Zhu, Yan.(2025).The Chinese Pulsar Timing Array Data Release I Single pulsar noise analysis.ASTRONOMY & ASTROPHYSICS,699.
MLA Chen, Siyuan,et al."The Chinese Pulsar Timing Array Data Release I Single pulsar noise analysis".ASTRONOMY & ASTROPHYSICS 699(2025).

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来源：云南天文台

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