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Frontiers of Physics

ISSN 2095-0462

ISSN 2095-0470(Online)

CN 11-5994/O4

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Front. Phys.    2021, Vol. 16 Issue (1) : 14501    https://doi.org/10.1007/s11467-020-0989-x
RESEARCH ARTICLE
Self-organized criticality in multi-pulse gamma-ray bursts
Fen Lyu1,2, Ya-Ping Li3(), Shu-Jin Hou4, Jun-Jie Wei1, Jin-Jun Geng6,7(), Xue-Feng Wu1,5()
1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
4. College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China
5. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China
6. School of Astronomy and Space Science, Nanjing University, Nanjing 210023, China
7. Institute of Astronomy and Astrophysics, University of Tübingen, Auf der Morgenstelle 10, D-72076, Tübingen, Germany
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Abstract

The variability in multi-pulse gamma-ray bursts (GRBs) may help to reveal the mechanism of underlying processes from the central engine. To investigate whether the self-organized criticality (SOC) phenomena exist in the prompt phase of GRBs, we statistically study the properties of GRBs with more than 3 pulses in each burst by fitting the distributions of several observed physical variables with a Markov Chain Monte Carlo approach, including the isotropic energy Eiso, the duration time T, and the peak count rate P of each pulse. Our sample consists of 454 pulses in 93 GRBs observed by the CGRO/BATSE satellite. The best-fitting values and uncertainties for these power-law indices of the differential frequency distributions are: αE d=1.54 ±0.09, αT d= 1.820.15+0.14 and αPd=2.090.19+0.18, while the power-law indices in the cumulative frequency distributions are: αE c= 1.440.10+0.08, αTc=1.750.13+0.11 and αP c= 1.990.19+0.16. We find that these distributions are roughly consistent with the physical framework of a Fractal-Diffusive, Self-Organized Criticality (FD-SOC) system with the spatial dimension S = 3 and the classical diffusion β=1. Our results support that the jet responsible for the GRBs should be magnetically dominated and magnetic instabilities (e.g., kink model, or tearing-model instability) lead the GRB emission region into the SOC state.

Keywords gamma-ray burst      general methods: statistical     
Corresponding Author(s): Ya-Ping Li,Jin-Jun Geng,Xue-Feng Wu   
Just Accepted Date: 25 August 2020   Issue Date: 19 October 2020
 Cite this article:   
Fen Lyu,Ya-Ping Li,Shu-Jin Hou, et al. Self-organized criticality in multi-pulse gamma-ray bursts[J]. Front. Phys. , 2021, 16(1): 14501.
 URL:  
https://academic.hep.com.cn/fop/EN/10.1007/s11467-020-0989-x
https://academic.hep.com.cn/fop/EN/Y2021/V16/I1/14501
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