Repeating fast radio burst 20201124A originates from a magnetar/Be star binary

被引：58

作者：

Wang, F. Y. ^{[1
,2
]}

Zhang, G. Q. ^{[1
]}

Dai, Z. G. ^{[1
,3
]}

Cheng, K. S. ^{[4
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing, Peoples R China

[3] Univ Sci & Technol China, Dept Astron, Hefei 230026, Peoples R China

[4] Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Peoples R China

来源：

NATURE COMMUNICATIONS | 2022年 / 13卷 / 01期

基金：

中国国家自然科学基金;

关键词：

PSR B1259-63/LS 2883; MAGNETIC-FIELDS; H-ALPHA; PERIASTRON PASSAGE; FARADAY CONVERSION; SUPERNOVA KICKS; RAY BINARIES; MASS-LOSS; PULSAR; EMISSION;

D O I：

10.1038/s41467-022-31923-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Fast radio bursts (FRBs) are cosmic sources emitting millisecond-duration radio bursts. Although several hundreds FRBs have been discovered, their physical nature and central engine remain unclear. The variations of Faraday rotation measure and dispersion measure, due to local environment, are crucial clues to understanding their physical nature. The recent observations on the rotation measure of FRB 20201124A show a significant variation on a day time scale. Intriguingly, the oscillation of rotation measure supports that the local contribution can change sign, which indicates the magnetic field reversal along the line of sight. Here we present a physical model that explains observed characteristics of FRB 20201124A and proposes that repeating signal comes from a binary system containing a magnetar and a Be star with a decretion disk. When the magnetar approaches the periastron, the propagation of radio waves through the disk of the Be star naturally leads to the observed varying rotation measure, depolarization, large scattering timescale, and Faraday conversion. This study will prompt to search for FRB signals from Be/X-ray binaries. Fast radio bursts (FRBs) are bright millisecond or shorter duration transient events. Here, the authors propose that FRB 20201124A comes from a binary system of a magnetar and a Be star with a decretion disk.

引用

页数：9

共 103 条

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