BLAZAR HALOS AS PROBE FOR EXTRAGALACTIC MAGNETIC FIELDS AND MAXIMAL ACCELERATION ENERGY

被引：47

作者：

Dolag, K. ^{[1
]}

Kachelriess, M. ^{[2
]}

Ostapchenko, S. ^{[2
,3
]}

Tomas, R. ^{[4
]}

机构：

[1] Max Planck Inst Astrophys, D-85741 Garching, Germany

[2] NTNU, Inst Fys, Trondheim, Norway

[3] Moscow MV Lomonosov State Univ, DV Skobeltsyn Inst Nucl Phys, Moscow, Russia

[4] Univ Hamburg, Inst Theoret Phys 2, D-22761 Hamburg, Germany

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 703卷 / 01期

关键词：

galaxies: active; gamma rays: theory; GAMMA-RAY ABSORPTION; 1ES 1959+650; RADIATION; EMISSION;

D O I：

10.1088/0004-637X/703/1/1078

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

High-energy photons from blazars interact within tens of kpc with the extragalactic photon background, initiating electromagnetic pair cascades. The charged component of such cascades is deflected by extragalactic magnetic fields (EGMFs), leading to halos even around initially point-like sources. We calculate the intensity profile of the resulting secondary high-energy photons for different assumptions on the initial source spectrum and the strength of the EGMF, employing also fields found earlier in a constrained simulation of structure formation including magnetohydrodynamics processes. We find that the observation of halos around blazars like Mrk 180 probes an interesting range of EGMF strengths and acceleration models: in particular, blazar halos test if the photon energy spectrum at the source extends beyond similar to 100 TeV and how anisotropic this high-energy component is emitted.

引用

页码：1078 / 1085

页数：8

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