An X-Ray Burst Associated with FRB 200428 from a Magnetar-asteroid Impact  

作　　者：Ze-Nan Liu Yuan-Pei Yang Wei-Yang Wang Zhao Joseph Zhang Qiao-Chu Li Ken Chen Jia Ren Bin-Bin Zhang Cheng-Kui Li Shuang-Nan Zhang Zi-Gao Dai 

机构地区：[1]School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China [2]Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University),Ministry of Education,Nanjing 210023,China [3]South-Western Institute for Astronomy Research,Yunnan University,Kunming 650500,China [4]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [5]University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100049,China [6]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [7]Department of Astronomy,School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China

出　　处：《Research in Astronomy and Astrophysics》2023年第8期238-246,共9页天文和天体物理学研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0402600,2018YFA0404204);the National SKA Program of China(Grant No.2020SKA0120300);the National Natural Science Foundation of China(NSFC,Grant Nos.11833003,U2038105);supported by the National Natural Science Foundation of China(NSFC,Grant No.12003028);support from the National Natural Science Foundation of China(NSFC,Grant No.U1838113);the National Natural Science Foundation of China(NSFC,Grant Nos.11833003 and U2038105);the Program for Innovative Talents,Entrepreneur in Jiangsu;Yunnan University(Grant No.C176220100087);support by Fundamental Research Funds for the Central Universities(14380046);the National Key Research and Development Programs of China(2018YFA0404204);the science research grants from the China Manned Space Project with NO.CMS-CSST-2021-B11;the Program for Innovative Talents,Entrepreneur in Jiangsu。

摘　　要：Fast radio bursts(FRBs)are extragalactic radio transients with millisecond duration and brightness temperature.An FRB-associated X-ray burst(XRB)was recently found to arise from the Galactic magnetar SGR J1935+2154.Following the model of Dai,in which an FRB may originate from a magnetar encountering an asteroid,we focus on explaining the spectrum of the XRB associated with FRB 200428 from SGR J1935+2154.Collisions between asteroidal fragments and the magnetar surface produce a fireball,which further expands relativistically.Due to the velocity difference among some shells in the fireball,internal shocks would form far away from the magnetar,and further emit X-ray emission.We propose that the FRB-associated XRB can be produced by synchrotron emission from the internal shocks,and then constrain the physical parameters by the observed XRB spectrum.

关 键 词：STARS magnetars-minor planets-asteroids general-radiation mechanisms GENERAL 

分 类 号：P172.2[天文地球—天文学]