Implications of a PeV neutrino spectral cut-off in gamma-ray burst models

被引:40
作者
Petropoulou, M. [1 ]
Giannios, D. [1 ]
Dimitrakoudis, S. [2 ]
机构
[1] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA
[2] Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Penteli 15236, Greece
关键词
neutrinos; radiation mechanisms: non-thermal; gamma-ray burst: general; PROMPT EMISSION; RAREFACTION ACCELERATION; MAGNETIC RECONNECTION; TEMPORAL SIGNATURES; PEAK ENERGY; GRB; DYNAMICS; CATALOG;
D O I
10.1093/mnras/stu1757
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The recent discovery of extragalactic PeV neutrinos opens a new window to the exploration of cosmic ray accelerators. The observed PeV neutrino flux is close to the Waxman-Bahcall upper bound implying that gamma-ray bursts (GRBs) may be the source of ultrahigh energy cosmic rays (UHECRs). Starting with the assumption of the GRB-UHECR connection, we show using both analytical estimates and numerical simulations that the observed neutrinos can originate at the jet as a result of photopion interactions with the following implications: the neutrino spectra are predicted to have a cut-off at energy less than or similar to 10 PeV; the dissipation responsible for the GRB emission and cosmic ray acceleration takes place at distances r(diss) similar or equal to 3 x 10(11)-3 x 10(13) cm from the central engine; the Thomson optical depth at the dissipation region is tau(T) similar to 1; the jet carries a substantial fraction of its energy in the form of Poynting flux at the dissipation region, and has a Lorentz factor Gamma similar or equal to 100-500. The non-detection of PeV neutrinos coincident with GRBs will indicate that GRBs are either poor cosmic accelerators or the dissipation takes place at small optical depths in the jet.
引用
收藏
页码:570 / 580
页数:11
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