主要内容:
此文主要解决问什么电子可以加速到那么高的能量。主要是考虑各种时标。
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文章信息:
- · arXiv e-print (arXiv:1003.5916)
- · References in the Article
- · Citations to the Article (3) (Citation History)
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| Title: |
| Implications of diffusive shock acceleration for high-energy radiation from gamma-ray bursts |
| Authors: |
| Barniol Duran, Rodolfo; Kumar, Pawan |
| Publication: |
| eprint arXiv:1003.5916 |
| Publication Date: |
| 03/2010 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| Submitted to MNRAS Letters |
| Bibliographic Code: |
| 2010arXiv1003.5916B |
Abstract
In a recent work we suggested that photons of energy >100 MeV detected from GRBs by the Fermi Satellite are produced via synchrotron emission in the external forward shock with a weak magnetic field. This Letter addresses the question of electron acceleration to high energies in this scenario. We find that electrons can indeed be accelerated to energies such that they radiate synchrotron photons with energy up to about 10 GeV. The only condition required is that the external reverse shock emission be not too bright: peak flux less than 1 Jy in order to produce photons of 100 MeV, and less than ~100mJy for producing 1 GeV photons. We also find that the acceleration time for electrons radiating at 100 MeV is a few seconds (in observer frame), and the acceleration time is somewhat longer for electrons radiating at a few GeV. This could explain the lack of $>$100 MeV photons for the first few seconds after the trigger time for long GRBs reported by the Fermi Satellite, and also the slight lag between photons of GeV and 100 MeV energies. We model the onset of the external forward shock light curve in this scenario and find it consistent with the sharp rise observed in the 100 MeV light curve of GRB080916C and similar bursts.
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