EXTRAGALACTIC VERY HIGH ENERGY GAMMA-RAY BACKGROUND

被引：11

作者：

Neronov, A. ^{[1
,2
]}

Semikoz, D. V. ^{[3
,4
]}

机构：

[1] ISDC Data Ctr Astrophys, CH-1290 Versoix, Switzerland

[2] Observ Geneva, CH-1290 Sauverny, Switzerland

[3] APC, F-75205 Paris 13, France

[4] Inst Nucl Res RAS, Moscow 117312, Russia

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 757卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

BL Lacertae objects: general; gamma rays: diffuse background; ACTIVE GALACTIC NUCLEI; LARGE-AREA TELESCOPE; RADIO-LOUD AGN; COSMIC EVOLUTION; RADIATION; NEUTRINOS; UNIVERSE;

D O I：

10.1088/0004-637X/757/1/61

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the origin of the extragalactic diffuse gamma-ray background using the data from the Fermi telescope. To estimate the background level, we count photons at high Galactic latitudes vertical bar b vertical bar > 60 degrees. Subtracting photons associated with known sources and the residual cosmic-ray and Galactic diffuse backgrounds, we estimate the extragalactic gamma-ray background (EGB) flux. We find that the spectrum of EGB in the very high energy band above 30 GeV follows the stacked spectrum of BL Lac objects. Large Area Telescope data reveal the positive (1 + z)(k), 1 < k < 4 cosmological evolution of the BL Lac source population consistent with that of their parent population, Fanaroff-Riley type I radio galaxies. We show that EGB at E > 30 GeV could be completely explained by emission from unresolved BL Lac objects if k similar or equal to 3.

引用

页数：10

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