摘要
快速射电暴(FRB)是一类高度色散且短时标的射电爆发现象,大多数定位于高银纬地区并且光变曲线呈简单的单脉冲结构.FRB在其大致毫秒量级的持续时间内可释放出的总能量约为1038–1040erg,其发生率约为103–104Gpc-3yr-1,远高于同样条件下伽马暴(GRB)的事件率.目前已公布超过100个FRB事件,人们构建了几十个理论模型来试图解释这类现象,如双致密星并合、致密天体的坍缩、中子星与小天体的碰撞及相互作用、磁星的巨耀发以及脉冲星的巨脉冲等.但依赖单一射电波段的观测还很难对诸多模型进行辨别,而FRB的多波段辐射很有可能对其模型及爆发机制给予有效的甄别或限制,因而多波段探测对FRB的研究至关重要.本文详细地归纳和整理了FRB的主要理论模型,并重点分析了各种理论预言的高能电磁辐射的情况,同时介绍了我国正在研制建设中的GECAM卫星将如何凭借其在伽马射线的全天、高灵敏度及宽能段的监测能力,对这些理论模型进行一定的筛选与验证.
The fast radio bursts(FRB) are a type of radio bursts with a high dispersion and short time scale. Most of them are known to be located in the high galactic latitude area and the light curve is known to be a simple single pulse structure. The total energy released by FRB is approximately 1038–1040 erg in the duration of approximately several milliseconds;and the rate of FRB is about approximately 103–104 Gpc-3 yr-1, which is much higher than that of GRB under the same condition.At present, >100 FRB events have been published, and theoretical models have been constructed to explain such phenomena, such as the combination of double compact stars, the collapse of compact stars, the collision and interaction between neutron stars and small celestial bodies, the giant flare of magnetic stars and the giant pulse of the pulsars.However, it is difficult to distinguish between these models based on a single radio band, and the multi-band radiation of FRB is likely to effectively distinguish or restrict this model and its mechanism;hence, multi-band detection is very important for the research of FRB. In this paper, the main theoretical models of FRB are summarized and organized in detail, and the situation of high-energy electromagnetic radiation in these theories has been emphatically analyzed. In addition, the GECAM satellite under construction in China will be expected to actualize the monitoring of gamma-ray in the whole sky, full time and wide energy range, and its future detection results will be expected to screen and verify these theoretical models.
作者
王敏浩
高鹤
王界双
李兵
俞云伟
刘彤
戴子高
WANG MinHao;GAO He;WANG JieShuang;LI Bing;YU YunWei;LIU Tong;DAI ZiGao(Department of Astronomy,Beijing Normal University,Beijing 100875,China;Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physical Science and Technology,Central China Normal University,Wuhan 430097,China;Department of Astronomy,Xiamen University,Xiamen 361005,China;School of Astronomy and Space Science,Nanjing University,Nanjing 210023,China)
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2020年第12期21-32,共12页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家重点基础研究发展计划(编号:2014CB845800)
国家自然科学基金(编号:11543005,11603003,11633001)资助项目。
关键词
中子星
脉冲星
射电与微波
neutron stars
pulsars
radio and microwave
