Transparency of the Universe to gamma-rays

Transparency of the Universe to gamma-rays
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宇宙对伽马射线的透明度

DOI:
10.1093/mnras/stt684
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发表时间:
2013
影响因子:
4.8
通讯作者:
M. Roncadelli
M. Roncadelli
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Angelis;G. Galanti;M. Roncadelli

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本文利用河外背景光和射电背景的最新观测资料,对红移为z_S<3的源,计算了10GeV<E_0&lt范围内观测到的伽马射线光子的能量E_0;10^13GeV,由此得到的光学厚度tau_γ(E_0,z_S)取值为1、2、3和4.6,分别对应于观测到的通量减淡e^-1=0.37、e^-2=0.14、e^-3=0.05和e^-4.6=0.01。在震源距离D=8kpc以下,我们发现对于任意值E_0,tau_Gamma(E_0,dH_0/c)<1。在局域宇宙(z_S=0)的极限情况下,我们将我们的结果与1997年由Coppi和Aharung得到的结果进行了比较。目前的成果对CTA、HAWC和HiSCORE等计划中的地面探测器至关重要。
Using the most recent observational data concerning the Extragalactic Background Light and the Radio Background, for a source at a redshift z_s < 3 we compute the energy E_0 of an observed gamma-ray photon in the range 10 GeV < E_0 < 10^13 GeV such that the resulting optical depth tau_gamma(E_0,z_s) takes the values 1, 2, 3 and 4.6, corresponding to an observed flux dimming of e^-1 = 0.37, e^-2 = 0.14, e^-3 = 0.05 and e^-4.6 = 0.01, respectively. Below a source distance D = 8 kpc we find that tau_gamma(E_0,DH_0/c) < 1 for any value of E_0. In the limiting case of a local Universe (z_s = 0) we compare our result with the one derived in 1997 by Coppi and Aharonian. The present achievement is of paramount relevance for the planned ground-based detectors like CTA, HAWC and HiSCORE.
费米大面积望远镜对宇宙伽马射线不透明度的限制
DOI: 10.1088/0004-637x/723/2/1082
发表时间: 2010
期刊: The Astrophysical Journal
影响因子: --
作者:
Abdo A
通讯作者: Abdo A