Ultrahigh-energy cosmic-ray signature in GRB 221009A

被引：22

作者：

Das, Saikat ^{[1
]}

Razzaque, Soebur ^{[2
,3
,4
,5
]}

机构：

[1] Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys & Quantum Informat, Kyoto 6068502, Japan

[2] Univ Johannesburg, Ctr Astroparticle Phys CAPP, POB 524, ZA-2006 Auckland Pk, South Africa

[3] Univ Johannesburg, Dept Phys, POB 524, ZA-2006 Auckland Pk, South Africa

[4] George Washington Univ, Dept Phys, Washington, DC 20052 USA

[5] Natl Inst Theoret & Computat Sci NITheCS, Private Bag X1, Matieland, South Africa

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 670卷

关键词：

astroparticle physics; gamma rays; general; gamma-ray burst; individual; GRB; 221009A; cosmic rays; EXTRAGALACTIC BACKGROUND LIGHT; SELF-COMPTON EMISSION; GAMMA-RAYS; BURSTS; NEUTRINOS; AFTERGLOW; ORIGIN; SYNCHROTRON; SEARCH; RADIO;

D O I：

10.1051/0004-6361/202245377

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The brightest long gamma-ray burst (GRB) detected so far by the Swift-BAT and Fermi-GBM telescopes, GRB 221009A, provides an unprecedented opportunity for understanding the high-energy processes in extreme transient phenomena. We find that the conventional leptonic models for the afterglow emission from this source, synchrotron and synchrotron-self-Compton, have difficulties explaining the observation of greater than or similar to 10 TeV gamma rays (as high as 18 TeV) by the LHAASO detector. We modeled the gamma-ray spectrum estimated in the energy range 0.1-1 GeV by the Fermi-LAT detector. The flux predicted by our leptonic models is severely attenuated at > 1 TeV due to gamma gamma pair production with extragalactic background light, and hence an additional component is required at greater than or similar to 10 TeV. Ultrahigh-energy cosmic rays can be accelerated in the GRB blast wave, and their propagation induces an electromagnetic cascade in the extragalactic medium. The line-of-sight component of this flux can explain the emission at greater than or similar to 10 TeV detected by LHAASO, which requires a fraction of the GRB blast wave energy to be in ultrahigh-energy cosmic rays. This could be an indication of ultrahigh-energy cosmic-ray acceleration in GRBs.

引用

页数：4

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