Mechanism of GRB Emission

伽玛暴发射机制

• 批准号: 1008334
• 负责人: Andrei Beloborodov
• 金额: $ 53.05万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1008334&HistoricalAwards=false
• 关键词: Mechanism; GRB; Emission

Emission from gamma-ray burst (GRB) jets is complicated by the presence of free neutrons, magnetic fields, and random variability. This project is a systematic study of the jet radiative history, from the early blackbody stage through neutron migration and collisional heating to internal shocks and neutron decay, culminating in the external blast wave. Recent work by the present researcher shows that the main component of GRB emission is naturally produced at the photosphere of the relativistic jet heated by nuclear and Coulomb collisions. The current study will use three state-of-the-art numerical codes that calculate radiative transfer, collisional processes, and collective plasma processes in the expanding jet. The ultimate goal is to reconstruct the radiative history of GRB jets and estimate their Lorentz factors and magnetization.GRB research impacts various fields in astronomy, from the theory of stellar core-collapse to jets in active galactic nuclei to early star formation in the Universe to future gravitational wave astronomy to new theories of mass extinction on the Earth. GRB research also impacts fundamental physics through understanding new properties of matter under extreme conditions. The research will involve graduate and undergraduate students, and the results will be disseminated at conferences and taught as part of high-energy astrophysics courses at Columbia University.

伽玛射线暴（GRB）喷流的发射由于自由中子、磁场和随机变化的存在而变得复杂。 该项目是对喷流辐射历史的系统研究，从早期黑体阶段到中子迁移和碰撞加热，再到内部冲击和中子衰变，最终形成外部冲击波。 本研究者最近的工作表明，伽玛暴辐射的主要成分是在核碰撞和库仑碰撞加热的相对论喷流光球中自然产生的。 目前的研究将使用三个国家的最先进的数值代码，计算辐射传输，碰撞过程，并在扩大射流集体等离子体过程。 伽玛射线暴的研究影响着天文学的各个领域，从恒星核坍缩理论到活动星系核中的喷流，从宇宙中早期星星的形成到未来的引力波天文学，再到地球大灭绝的新理论。 伽玛射线暴研究还通过理解极端条件下物质的新性质影响基础物理学。 这项研究将涉及研究生和本科生，研究结果将在会议上传播，并作为哥伦比亚大学高能天体物理学课程的一部分教授。