摘要
快速射电暴(Fast Radio Bursts,FRBs)是来自河外的短暂而明亮的射电能量脉冲,有重复快速射电暴和非重复快速射电暴两种类型。重复快速射电暴的重复爆发行为可能源于一个具有强偶极磁场的中子星和磁化的白矮星组成的致密双星系统。当白矮星充满它的洛希瓣时,物质将通过内拉格朗日点转移到中子星表面。一次爆发之后,白矮星可能被踢开,在演化过程中再次吸积,实现重复爆发现象。根据重复射电暴FRB 121102和FRB 180916重复爆发的观测数据,研究了白矮星-中子星的双星模型中两次爆发的时间间隔和两次爆发中前次爆发的流量之间的关系,通过理论值和观测值的比较,肯定了这样一个间歇的洛希瓣外流机制可能解释重复快速射电暴的重复爆发行为。
Fast Radio Bursts(FRBs)are transient and bright radio pulses from cosmological origins,which have two types:repeating FRBs and non-repeating FRBs.A compact binary system composed of a neutron star with a strong bipolar magnetic field and a magnetic white dwarf may be able to explain the repeated behavior of repeating FRBs.When the white dwarf fills its Roche lobe,mass transfer will occur through the inner Lagrange point to the surface of the neutron star.After an explosion,the white dwarf may be kicked away,and accreted again in the evolution process to realize the phenomenon of repeated explosion.Based on the observation data of repeating FRBs 121102 and 180916,we studied the relationship between the time interval of two adjacent bursts and the fluence of the subsequent burst in the neutron star-white dwarf binary model.By comparing the theoretical values with the observed values,we confirmed that such an intermittent outflow mechanism of Roche lobe may explain the repeated behavior of repeating FRBs.
作者
林一清
程再军
Lin Yiqing;Cheng Zaijun(Fujian Provincial Key Laboratory of Optoelectronic Technology and Devices,Xiamen University of Technology,Xiamen 361024,China;School of Optoelectronic&Communication Engineering,Xiamen University of Technology,Xiamen 361024,China)
出处
《天文研究与技术》
CSCD
2020年第4期414-418,共5页
Astronomical Research & Technology
基金
国家自然科学基金(U1231101)
福建省自然科学基金(2018J01567)资助.
关键词
快速射电暴
白矮星
吸积
引力辐射
磁重联
Fast Radio Burst
White dwarf
Accretion
Gravitational radiation
Magnetic reconnection
