Closure Relations of Gamma-Ray Bursts in High Energy Emission

被引:22
作者
Tak, Donggeun [1 ,2 ]
Omodei, Nicola [3 ,4 ]
Uhm, Z. Lucas [2 ,5 ]
Racusin, Judith [2 ]
Asano, Katsuaki [6 ]
McEnery, Julie [1 ,2 ]
机构
[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] Stanford Univ, Dept Phys, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA
[4] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[5] Korea Astron & Space Sci Inst, Daejeon 34055, South Korea
[6] Univ Tokyo, Inst Cosm Ray Res, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778582, Japan
基金
瑞典研究理事会; 美国国家航空航天局;
关键词
gamma-ray burst: general; LIGHT CURVES; X-RAY; FERMI OBSERVATIONS; ULTRARELATIVISTIC SHOCKS; PARTICLE-ACCELERATION; AFTERGLOW EMISSION; BLAST WAVES; GRB; 090510; SWIFT; SYNCHROTRON;
D O I
10.3847/1538-4357/ab3982
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The synchrotron external shock model predicts the evolution of the spectral (beta) and temporal (alpha) indices during the gamma-ray burst (GRB) afterglow for different environmental density profiles, electron spectral indices, electron cooling regimes, and regions of the spectrum. We study the relationship between alpha and beta, the so-called " closure relations" with GRBs detected by Fermi Large Area Telescope (Fermi-LAT) from 2008 August to 2018 August. The spectral and temporal indices for the > 100 MeV emission from the Fermi-LAT as determined in the Second Fermi-LAT Gamma-Ray Burst Catalog (2FLGC) are used in this work. We select GRBs whose spectral and temporal indices are well constrained (58 long-duration GRBs and 1 short-duration GRBs) and classify each GRB into the best-matched relation. As a result, we found that a number of GRBs require a very small fraction of the total energy density contained in the magnetic field (epsilon(B) less than or similar to 10(-7)). The estimated mean and standard deviation of electron spectral index p are 2.40 and 0.44, respectively. The GRBs satisfying a closure relation of the slow cooling tend to have a softer p value compared to those of the fast cooling. Moreover, the Kolmogorov-Smirnov test of the two p distributions from the fast and slow coolings rejects a hypothesis that the two distributions are drawn from the single reference distribution with a significance of 3.2 sigma. Lastly, the uniform density medium is preferred over the medium that decreases like the inverse of distance squared for long-duration GRBs.
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页数:10
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