伽玛暴(Gamma-Ray Burst)笔记。记录有关伽玛暴的新文章,另外也包括看的老文章、自己的想法、以及跟天文相关的一些东西。 Feel free to leave me a message by comments or by email.

星期三, 十二月 31, 2008

Ioka 2008 伽玛暴作为TeV谱上"超"的来源

主要内容:

只考虑了谱, 完全没考虑流量, 时标, 方向性... 而且谱也是假设伽玛暴有TeV的光子出来
精彩摘抄:


文章信息:

arXiv:0812.4851 [ps, pdf, other]
Title: A Gamma-Ray Burst for Cosmic-Ray Positrons with a Spectral Cutoff and Line
Authors: Kunihito Ioka (KEK)
Comments: 4 pages, 3 figures
Subjects: Astrophysics (astro-ph)

We propose that a nearby gamma-ray burst (GRB) about 10^{5-6} years ago may be responsible for the excesses of cosmic-ray positrons and electrons recently observed by the PAMELA and ATIC/PPB-BETS experiments. The spectra have a sharp cutoff that is similar to the dark matter predictions, possibly together with a line (not similar), since higher energy cosmic-rays cool faster where the cutoff/line energy marks the source age. The same is true if a source is GRB-like (old, single and short-lived). An astrophysical source is expected to have a small but finite spread in the cutoff/line as well as anisotropy in the cosmic-ray flux, providing a method for the Fermi and future CALET experiments to discriminate between dark matter and astrophysical origins.

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