Murase 2007 伽玛暴中的正负电子对信号

主要内容:
认为GLAST可以检验正负电子对产生以及由于超过产生的能量的光子都可以产生电子对而导致的cutoff信号。

精彩摘抄:


文章信息:

arXiv:0708.1370 [ps, pdf, other]

Title: Closure Relations for Electron-Positron Pair-Signatures in Gamma-Ray Bursts

Authors: Kohta Murase, Kunihito Ioka

Comments: 4 pages, 1 figure

Subjects: Astrophysics (astro-ph)

We present recipes to diagnose the fireball of gamma-ray bursts (GRBs) by combining observations of electron-positron pair-signatures (the pair-annihilation line and the cutoff energy due to the pair-creation process). Our recipes are largely model-independent and extract information even from the non-detection of either pair-signature. We evaluate physical quantities such as the Lorentz factor, optical depth and pair-to-baryon ratio, only from the observable quantities. In particular, we can test whether prompt emission of GRBs comes from the pair/baryonic photosphere or not. The future-coming Gamma-Ray Large Area Space Telescope (GLAST) satellite will provide us with good chances to use our recipes by detecting pair-signatures.