TIME DELAY OF CASCADE RADIATION FOR TeV BLAZARS AND THE MEASUREMENT OF THE INTERGALACTIC MAGNETIC FIELD

被引：189

作者：

Dermer, Charles D. ^{[1
]}

Cavadini, Massimo ^{[2
]}

Razzaque, Soebur ^{[1
]}

Finke, Justin D. ^{[1
]}

Chiang, James ^{[3
,4
]}

Lott, Benoit ^{[5
,6
]}

机构：

[1] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA

[2] Univ Insubria, Dipartimento Matemat & Fis, I-22100 Como, Italy

[3] Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

[4] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[5] CNRS IN2P3, Ctr Etud Nucl Bordeaux Gradignan, UMR 5797, F-33175 Gradignan, France

[6] 40 Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, UMR 5797, F-33175 Gradignan, France

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 733卷 / 02期

关键词：

galaxies: jets; gamma rays: galaxies; radiation mechanisms: non-thermal; ACTIVE GALACTIC NUCLEI; EXTRAGALACTIC BACKGROUND LIGHT; LARGE-AREA TELESCOPE; GAMMA-RAY BURSTS; FERMI OBSERVATIONS; EMISSION; CONSTRAINTS; HALOS; ERA;

D O I：

10.1088/2041-8205/733/2/L21

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent claims that the strength B-IGMF of the intergalactic magnetic field (IGMF) is greater than or similar to 10(-15) G are based on upper limits to the expected cascade flux in the GeV band produced by blazar TeV photons absorbed by the extragalactic background light. This limit depends on an assumption that the mean blazar TeV flux remains constant on timescales greater than or similar to 2(B-IGMF/10(-18)G)(2)/(E/10 GeV)(2) yr for an IGMF coherence length approximate to 1 Mpc, where E is the measured photon energy. Restricting TeV activity of 1ES 0229+200 to approximate to 3-4 years during which the source has been observed leads to a more robust lower limit of B-IGMF greater than or similar to 10(-18) G, which can be larger by an order of magnitude if the intrinsic source flux above approximate to 5-10 TeV from 1ES 0229+200 is strong.

引用

页数：5

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