摘要
拉索首次完整记录了最亮伽马射线暴GRB 221009A的TeV以上高能光子爆发的全过程,发现了高能光子亮度在早期的增强以及后期突然快速减弱,由此确定GRB221009A的喷流具有极高的洛伦兹因子和迄今已知最小的张角,揭开了此伽马射线暴成为史上最亮的秘密。拉索还首次将伽马射线暴余辉的能谱测量延伸至10 TeV以上,发现其能谱表现为单一的幂律形式,挑战了伽马射线暴余辉辐射的标准模型。GRB 221009A的TeV能谱还意味着宇宙比预期的更加透明,说明红外背景光强度低于预期,或者存在超出当前粒子物理标准模型的新机制解释观测到的弱吸收现象。
The Large High Altitude Air Shower Observatory(LHAASO)first recorded the complete temporal evolution of the TeV emission from the brightest-of-all-time GRB 221009A,including the early rise and late decay phases.A high initial Lorentz factor and an extremely narrow jet,which is considered to be the brightest core of the jet,are inferred from the data,interpreting the unprecedent brightness of this GRB.LHAASO also detected photons above 10 TeV from this GRB for the first time and the intrinsic energy spectrum of gamma-rays can be described by a powerlaw after correcting for extragalactic background light absorption.Such a hard spectrum challenges the standard synchrotron self-Compton scenario of the afterglow emission above several teraelectronvolts.Detection of gamma-rays up to 13 teraelectronvolts from this GRB also hints more transparency in intergalactic space than previously expected,or new physics to explain the origin of the very high-energy signals.
作者
王祥玉
姚志国
陈松战
曹臻
WANG Xiangyu;YAO Zhiguo;CHEN Songzhan;CAO Zhen(School of Astronomy and Space Science,Nanjing University,Nanjing 210023;Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University),the Ministry of Education,Nanjing 210023;Tianfu Cosmic Ray Research Center,Chengdu 610000;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049;University of Chinese Academy of Sciences,Beijing 100049)
出处
《中国基础科学》
2024年第1期33-38,57,共7页
China Basic Science
基金
国家自然科学基金项目(12333006,12121003)
