快速射电暴脉冲研究进入高统计性时代  

FAST helps push the study of fast radio bursts into statistical regimes

作　　者：徐佳莹 李菂 Jiaying Xu;Di Li(Zhejiang Lab,Hanghou 311100,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]之江实验室智能计算平台研究中心计算天文组,杭州31100 [2]中国科学院国家天文台,北京100101

出　　处：《科学通报》2022年第23期2700-2703,共4页Chinese Science Bulletin

摘　　要：快速射电暴(fast radio burst,FRB)是在宇宙空间中发生的持续时标为毫秒量级的射电脉冲信号,瞬时辐射流量峰值可达数十央斯基(Jy),爆发的总能量相当于太阳几天甚至几个月内辐射的总能量.快速射电暴于2007年被Lorimer等人[1]首次发现并报道之后,经历了初期的真实性质疑.The 2007 discovery of fast radio bursts(FRBs),bright and millisecond-duration astronomical radio pulses,presented to the astronomical community a tantalizing opportunity into the transient Universe.Understanding the origins,mechanisms and applications of FRBs is currently one of the most rapidly evolving sub-fields of astrophysics.Most FRBs originate from far outside the Milky Way and are many orders of magnitude more luminous than other known bursting radio sources,particularly pulsars(neutron stars).The total FRB population now stands at approximately 600 published sources,24 repeaters,and 19 with localized host galaxies.Most FRBs appear to be one-off,only about four percent of the FRBs are now known to repeat.While the volume of observations grows at a breakneck pace,the overarching question of the field remains:“Where do FRBs come from?”Interestingly,FRBs can be hosted in a variety of galaxy types and environments.FRB 20121102 was successfully located in a low-mass and low-metallicity dwarf galaxy,coincident with a persistent radio source.VLBI observations have demonstrated that this source is compact.With the Five-hundred-meter Aperture Spherical radio Telescope(FAST),FRB20121102 has been extensively observed,resulting in the discovery of 1652 independent bursts with a peak burst rate of122 per hour and over three orders of magnitude variation in energy.For the first time,the burst energy distribution can be fully recovered and is found to be bimodal,suggesting that there may be more than one emission mechanisms or emission sites or beam shapes.In contrast to the single power-law energy distribution commonly found for FRBs,a characteristic peak in the burst rate energy distribution is found at 4.8×10^(37) erg.The estimated total isotropic energy,6.4×10^(46) erg,released during the 47-day observational campaign,corresponds to approximately 38% of the available magnetar spin energy.Despite the high burst rate,no periodicity has been found.Higher time-resolution data,sustained monitoring,and better locali

关 键 词：瞬时辐射 电脉冲信号 央斯基 宇宙空间 总能量 真实性 

分 类 号：P162[天文地球—天文学]