Cerenkov line-like radiation and origin of iron Kα line in GRBs
Cerenkov line-like radiation and origin of iron Kα line in GRBs
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DOI：
10.1016/j.newast.2004.04.008
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发表时间：
2004-11-01
期刊：
影响因子：
2
通讯作者：
You, JH
中科院分区：
文献类型：
--
作者：
Chen, L;Liu, DB;You, JH
当具有各向同性速度分布的热相对论电子在气体区域中运动时，或撞击在致密气体板的表面上时，切伦科夫效应产生特殊的原子或离子发射线-切伦科夫线状辐射。这一新发现的发射机制在高能天体物理中有着广泛的应用。在本文中，我们给出了一个澄清的轮廓的物理新的发射机制，并认为切伦科夫线机制可能是负责在一些伽玛暴中观察到的铁K α线发射的X射线余辉阶段。如果对铁K α线起源的新探索是合理的，那么反对准直喷流模型和合并模型的论点就变得有争议了，因为所有的反对意见都来自于这样一个假设，即伽玛暴的铁K线起源于荧光复合机制，而这应该被切伦科夫线发射所取代。(C)2004 Elsevier B. V.保留所有权利。
When thermal relativistic electrons with isotropic distribution of velocities move in a gas region, or impinge upon the surface of a dense gas slab, the Cerenkov effect produces peculiar atomic or ionic emission lines - the Cerenkov line-like radiation. This newly recognized emission mechanism may find wide applications in high energy astrophysics. In this paper, we give a clarified outline of the physics of the new emission mechanism, and argue that Cerenkov line mechanism could be responsible for the iron Kalpha line emission observed in some GRBs in the X-ray afterglow phase. If this new exploration of the origin of iron Kalpha line is reasonable, the arguments against the models with collimated jet and the mergers models become debatable because all objections arise from the assumption that the iron K lines of GRBs originates in the fluorescence-recombination mechanisms, which should be replaced by the Cerenkov line emission, as argued in this paper. (C) 2004 Elsevier B.V. All rights reserved.