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Plasma lens with frequency-dependent dispersion measure effects on fast radio bursts

文献类型：期刊论文

作者Wang, Yu-Bin4; Zhou, Xia1,2,3; Kurban, Abdusattar1,2
刊名ASTRONOMY & ASTROPHYSICS
出版日期2025-09-23
卷号701页码:A278
关键词gravitational lensing: weak scattering methods: analytical methods: numerical stars: magnetars ISM: structure
ISSN号0004-6361
DOI10.1051/0004-6361/202453112
产权排序2
英文摘要Radio signals propagating through inhomogeneous plasma media deviate from their original paths, producing frequency-dependent magnification effects. In this paper, after reviewing the classical plasma-lensing theory, we have found a fundamental contradiction: the classical model assumes that the distribution of lensing plasma medium is related to the frequency-independent image position; however, our analysis demonstrates that both the image position (theta(nu)) and dispersion measure (DM(nu)) are inherently frequency-dependent when signals traverse a structured plasma medium. We have been able to resolve this paradox by developing a framework that explicitly incorporates frequency-dependent dispersion measures (DMs) following power-law relationships (DM proportional to nu(gamma)). Our analysis shows that the signal magnification decreases systematically with decreasing frequency, offering a plausible explanation for the frequency-dependent peak flux densities observed in fast radio bursts (FRBs), particularly in the case of the repeating FRB 180814.J0422+73. Our results suggest these FRBs could originate from the magnetized compact star magnetospheres. By considering these plasma-lensing effects on the sub-pulses of an FRB across different frequencies, we have the ability to more accurately investigate the intrinsic properties of FRBs via precise measurements of radio signals.
WOS关键词LIGHT-CURVE ; HOST GALAXY ; TIME-DELAY ; FRB 121102 ; SCATTERING ; POLARIZATION ; EMISSION ; COUNTERPART ; ENVIRONMENT
资助项目National Key R&D Program of China[2022YFA1603104] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[2022D01A363] ; National Natural Science Foundation of China[12403054] ; National Natural Science Foundation of China[12288102] ; National Natural Science Foundation of China[12033001] ; National Natural Science Foundation of China[12273028] ; Sichuan Provincial Natural Science Foundation Project[2025ZNSFSC0878] ; Talent introduction program of Sichuan University of Science Engineering[2024RC15] ; Talent introduction program of Sichuan University of Science Engineering[2023TSYCTD0013] ; Major Science and Technology Program of Xinjiang Uygur Autonomous Region[2022A03013-1] ; Major Science and Technology Program of Xinjiang Uygur Autonomous Region[2022A03013-3] ; Major Science and Technology Program of Xinjiang Uygur Autonomous Region[2022A03013-4] ; Urumqi Nanshan Astronomy and Deep Space Exploration Observation and Research Station of Xinjiang[XJYWZ2303] ; Xinjiang Uygur Autonomous Region ; Science and technology department of gansu province[20JR5RA481]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001578912300008
出版者EDP SCIENCES S A
资助机构National Key R&D Program of China ; Natural Science Foundation of Xinjiang Uygur Autonomous Region ; National Natural Science Foundation of China ; Sichuan Provincial Natural Science Foundation Project ; Talent introduction program of Sichuan University of Science Engineering ; Major Science and Technology Program of Xinjiang Uygur Autonomous Region ; Urumqi Nanshan Astronomy and Deep Space Exploration Observation and Research Station of Xinjiang ; Xinjiang Uygur Autonomous Region ; Science and technology department of gansu province
源URL[http://ir.xao.ac.cn/handle/45760611-7/8193]  
专题脉冲星研究团组
通讯作者Zhou, Xia
作者单位1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
2.Xinjiang Key Lab Radio Astrophys, 150 Sci 1 St, Urumqi 830011, Peoples R China
3.State Key Lab Radio Astron & Technol, Beijing 100101, Peoples R China
4.Sichuan Univ Sci & Engn, Sch Phys & Elect Engn, Zigong 643000, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Yu-Bin,Zhou, Xia,Kurban, Abdusattar. Plasma lens with frequency-dependent dispersion measure effects on fast radio bursts[J]. ASTRONOMY & ASTROPHYSICS,2025,701:A278.
APA Wang, Yu-Bin,Zhou, Xia,&Kurban, Abdusattar.(2025).Plasma lens with frequency-dependent dispersion measure effects on fast radio bursts.ASTRONOMY & ASTROPHYSICS,701,A278.
MLA Wang, Yu-Bin,et al."Plasma lens with frequency-dependent dispersion measure effects on fast radio bursts".ASTRONOMY & ASTROPHYSICS 701(2025):A278.

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来源：新疆天文台

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