Long-term variations of X-ray pulse profiles for the Crab pulsar: data analysis and modeling

doi:10.1007/s11433-019-1505-8

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	Long-term variations of X-ray pulse profiles for the Crab pulsar: data analysis and modeling
	Shang, LunHua 2,7; Du, YuanJie 7; Cui, XiangQun 2,6; Dang, ShiJun 4,5; Lu, JiGuang 3,8; Bai, JunTao 9,10; Zhi, QiJun 9,10; Tuo, YouLi 4,11; Yan, LinLi 4,11; Huang, LiangWei 7
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2020-04-30
卷号	63 期号:10 页码:109511
关键词	radiation mechanisms pulsars X-ray
ISSN号	1674-7348
DOI	10.1007/s11433-019-1505-8
产权排序	4
英文摘要	The pulse profiles of the Crab pulsar (as well as some other pulsars) vary with time. They can lead to a major source of intrinsic timing noise, which lacks a detailed physical model. The phase separation Delta between the first left peak (P1) and the second right peak (P2) is a key parameter that shows the variations of pulse profiles for the Crab pulsar. It was found that the evolution of A has a tendency with increasing rates of 0.82 degrees +/- 0.25 degrees, 0.80 degrees +/- 0.54 degrees, and 0.77 degrees +/- 0.28 degrees per century for the 2-6, 6-15, and 15-60 keV bands, respectively. Furthermore, the flux ratios (P2/P1) of X-ray pulse profiles in the three bands were calculated, and the derived flux ratios were consistent with the radio and X-ray measurements of the Insight-HXMT. In addition to discovering the physical origin of the pulse changes, the high-SNR X-ray pulse profiles were simulated in the annular gap model, and two model parameters (e.g., the maximum emission heights of the two peaks) were observed to slightly affect the variations of peak separation. We fitted the long-term variations of emission heights of the two peaks and discovered that the emission heights showed increasing tendencies with time. Variations of these emission heights induced a characteristic period derivative, and a complete formula for both the magnetic dipole radiation and wind-particle-induced variations of the moment of inertia was used for the pulsar's spin-down to obtain the variation rate alpha of the magnetic inclination angle, which was -1.60 degrees per century. Intrinsic timing noise is observed to be mainly induced by the variations of pulse profiles, which might correlate with a characteristic spin period derivative arising from the fluctuations of the emission regions. This work will lay a foundation for understanding the origin of intrinsic timing noise and making high-precision timing models in the future.
资助项目	National Key Research and Development Program of China[2017YFB0503300] ; National Key Research and Development Program of China[2016YFA0400804] ; National Natural Science Foundation of China[U1838106] ; National Natural Science Foundation of China[U1731238] ; National Natural Science Foundation of China[61803373] ; National Natural Science Foundation of China[11303069] ; National Natural Science Foundation of China[11373011] ; National Natural Science Foundation of China[11873080] ; Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences[XDA04010300] ; Operation, Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments ; China Na-tional Space Administration (CNSA) ; Chinese Academy of Sciences
WOS关键词	ANNULAR GAP ; GAMMA-RAY ; TIMING NOISE ; MAGNETOSPHERIC FLUCTUATIONS ; EMISSION ; GLITCHES ; EVOLUTION ; RADIATION ; ROTATION
WOS研究方向	Physics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000530308800001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences ; Operation, Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments ; China Na-tional Space Administration (CNSA) ; Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3475]
专题	脉冲星研究团组
通讯作者	Du, YuanJie
作者单位	1.Nanjing Univ Sci & Technol, Key Lab Adv Solid Laser, Nanjing 210094, Peoples R China 2.Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab FAST, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, XinJiang Astron Observ, Urumqi 830011, Peoples R China 6.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Peoples R China 7.Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China 8.Chinese Acad Sci, Guizhou Radio Astron Observ, Guiyang 550025, Peoples R China 9.Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Peoples R China 10.Guizhou Normal Univ, Guizhou Prov Key Lab Radio Astron & Data Proc, Guiyang 550001, Peoples R China
推荐引用方式 GB/T 7714	Shang, LunHua,Du, YuanJie,Cui, XiangQun,et al. Long-term variations of X-ray pulse profiles for the Crab pulsar: data analysis and modeling[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2020,63(10):109511.
APA	Shang, LunHua.,Du, YuanJie.,Cui, XiangQun.,Dang, ShiJun.,Lu, JiGuang.,...&Zhu, RiHong.(2020).Long-term variations of X-ray pulse profiles for the Crab pulsar: data analysis and modeling.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,63(10),109511.
MLA	Shang, LunHua,et al."Long-term variations of X-ray pulse profiles for the Crab pulsar: data analysis and modeling".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 63.10(2020):109511.