The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations

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	The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations
	Li, Z 1,2; Zhao XH(赵晓红)3,4
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2011-05
期号	5
关键词	magnetic fields particle acceleration cosmic ray theory gamma ray bursts theory
ISSN号	1475-7516
通讯作者	Li, Z (reprint author), Peking Univ, Dept Astron, Beijing 100871, Peoples R China.
产权排序	第三完成单位
英文摘要	Long-lived > 100 MeV emission has been a common feature of most Fe detected gamma-ray bursts (GRBs), e.g., detected up to similar to 10(3)s in long GRBs 080916C and 090902B and similar to 10(2)s in short GRB 090510. This emission is consistent with being produced by synchrotron emission of electrons accelerated to high energy by the relativistic collisionless shock propagating, into the weakly magnetized medium. Here we show that this high-energy all emission constrains the preshock magnetic field to satisfy 10(0)n(0)(9/8) mG < B-u < 10(2)n(0)(3/8) mG, where no is the preshock density in unit of 1 cm(-3), more stringent than the previous constraint by X-ray afterglow observations on day scale. This suggests that the preshock magnetic field is strongly amplified, most likely by the streaming of high energy shock accelerated particles.
学科主题	Astronomy & Astrophysics ; Physics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
关键词[WOS]	GAMMA-RAY BURSTS ; HIGH-ENERGY EMISSION ; COSMOLOGICAL FIREBALL MODEL ; RESIDUAL COLLISIONS ; RELATIVISTIC SHOCKS ; AFTERGLOW ; ACCELERATION ; 080916C ; PROMPT ; WAVES
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/1475-7516/2011/05/008/meta
语种	英语
WOS记录号	WOS:000291264100008
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5409]
专题	云南天文台_丽江天文观测站（南方基地）云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Department of Astronomy, Peking University, Beijing 100871, China 2.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 4.Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
推荐引用方式 GB/T 7714	Li, Z,Zhao XH. The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2011(5).
APA	Li, Z,&Zhao XH.(2011).The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(5).
MLA	Li, Z,et al."The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .5(2011).