CAN ULTRAHIGH-ENERGY COSMIC RAYS COME FROM GAMMA-RAY BURSTS? COSMIC RAYS BELOW THE ANKLE AND GALACTIC GAMMA-RAY BURSTS

被引：11

作者：

Eichler, David ^{[1
]}

Pohl, Martin ^{[2
,3
]}

机构：

[1] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel

[2] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[3] DESY, D-15738 Zeuthen, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 738卷 / 02期

关键词：

cosmic rays; galaxies: general; gamma-ray burst: general; SHOCKS;

D O I：

10.1088/2041-8205/738/2/L21

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The maximum cosmic-ray energy achievable by acceleration by a relativistic blast wave is derived. It is shown that forward shocks from long gamma-ray bursts (GRBs) in the interstellar medium accelerate protons to large enough energies, and have a sufficient energy budget, to produce the Galactic cosmic-ray component just below the ankle at 4 x 10(18) eV, as per an earlier suggestion. It is further argued that, were extragalactic long GRBs responsible for the component above the ankle as well, the occasional Galactic GRB within the solar circle would contribute more than the observational limits on the outward flux from the solar circle, unless an avoidance scenario, such as intermittency and/or beaming, allows the present-day local flux to be less than 10(-3) of the average. Difficulties with these avoidance scenarios are noted.

引用

页数：4

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