Hadronic Origin of Prompt High-energy Emission of Gamma-ray Bursts Revisited: In the Case of a Limited Maximum Proton Energy

被引:21
作者
Wang, Kai [1 ,2 ,3 ,4 ]
Liu, Ruo-Yu [2 ,5 ]
Dai, Zi-Gao [1 ]
Asano, Katsuaki [6 ]
机构
[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
[2] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany
[3] Peking Univ, Dept Astron, Beijing 100871, Peoples R China
[4] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
[5] Deutsch Elektronen Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany
[6] Univ Tokyo, Inst Cosm Ray Res, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778582, Japan
基金
中国国家自然科学基金;
关键词
cosmic rays; gamma-ray burst: general; radiation mechanisms: non-thermal; GRB; 080916C; SPECTRAL COMPONENT; FERMI OBSERVATIONS; SHOCK ORIGIN; RADIATION; MODELS;
D O I
10.3847/1538-4357/aab667
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The high-energy (> 100 MeV) emission observed by the Fermi Large Area Telescope during the prompt phase of some luminous gamma-ray bursts (GRBs) could arise from the cascade induced by interactions between accelerated protons and the radiation field of GRBs. The photomeson process, which is usually suggested to operate in such a hadronic explanation, requires a rather high proton energy (> 10(17) eV) for an efficient interaction. However, whether GRBs can accelerate protons to such a high energy is far from guaranteed, although they have been suggested as the candidate source for ultrahigh-energy cosmic rays. In this work, we revisit the hadronic model for the prompt high-energy emission of GRBs with a smaller maximum proton energy than the usually adopted value estimated from the Bohm condition. In this case, the Bethe-Heitler pair production process becomes comparably important or even dominates over the photomeson process. We show that with a relatively low maximum proton energy with a Lorentz factor of 10(5) in the comoving frame, the cascade emission can still reproduce various types of high-energy spectra of GRBs. For most GRBs without high-energy emission detected, the maximum proton energy could be even lower and relax the constraints on the parameters of the GRB jet resulting from the nondetection of GRB neutrinos by IceCube.
引用
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页数:12
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