Takahashi 2008 高能光子的正负电子对echo

主要内容:
当高能光子和星系背景光子碰撞，产生的正负电子对。这些正负电子再逆康普顿散射CMB的光子，被我们探测。

精彩摘抄:


文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:0806.2825)

· References in the Article

· Also-Read Articles (Reads History)

·

· Translate This Page

Title:		Detectability of Pair Echos from Gamma-Ray Bursts and Intergalactic Magnetic Fields
Authors:		Takahashi, Keitaro; Murase, Kohta; Ichiki, Kiyotomo; Inoue, Susumu; Nagataki, Shigehiro
Publication:		eprint arXiv:0806.2825
Publication Date:		06/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		4 pages, 4 figures
Bibliographic Code:		2008arXiv0806.2825T

Abstract

High-energy emission from gamma-ray bursts (GRBs) can give rise to pair echos, i.e. delayed inverse Compton emission from secondary $e^{\pm}$ pairs produced in $\gamma-\gamma$ interactions with intergalactic background radiation. We investigate the detectability of such emission with modern-day gamma-ray telescopes. The spectra and light curves are calculated for a wide range of parameters, applying the formalism recently developed by Ichiki et al. The flux depends strongly on the unknown magnitude and coherence length of intergalactic magnetic fields, and we delineate the range of field strength and redshift that allow detectable echos. Relevant uncertainties such as the high-energy cutoff of the primary gamma-ray spectrum and the intensity of the cosmic infrared background are addressed. GLAST and MAGIC may be able to detect pair echo emission from GRBs with redshift $\lesssim 1$ if the primary spectra extend to $\sim 10 ~ {\rm TeV}$.

---

Bibtex entry for this abstract Preferred format for this abstract (see Preferences)