Scale-invariance in soft gamma repeaters  

作　　者：常哲 林海南 桑语 王平 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences [2]School of Physics, University of Chinese Academy of Sciences [3]Department of Physics, Chongqing University

出　　处：《Chinese Physics C》2017年第6期122-127,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11375203,11675182,11690022,11603005);Fundamental Research Funds for Central Universities(106112016CDJCR301206)

摘　　要：The statistical properties of the soft gamma repeater SGR J1550-5418 are investigated carefully. We find that the cumulative distributions of fluence, peak flux and duration can be well fitted by a bent power law, while the cumulative distribution of waiting time follows a simple power law. In particular, the probability density functions of fluctuations of fluence, peak flux, and duration have a sharp peak and fat tails, which can be well fitted by a q-Gaussian function. The q values keep approximately steady for different scale intervals, indicating a scale-invariant structure of soft gamma repeaters. Those results support that the origin of soft gamma repeaters is crustquakes of neutron stars with extremely strong magnetic fields.The statistical properties of the soft gamma repeater SGR J1550-5418 are investigated carefully. We find that the cumulative distributions of fluence, peak flux and duration can be well fitted by a bent power law, while the cumulative distribution of waiting time follows a simple power law. In particular, the probability density functions of fluctuations of fluence, peak flux, and duration have a sharp peak and fat tails, which can be well fitted by a q-Gaussian function. The q values keep approximately steady for different scale intervals, indicating a scale-invariant structure of soft gamma repeaters. Those results support that the origin of soft gamma repeaters is crustquakes of neutron stars with extremely strong magnetic fields.

关 键 词：STARS individual （SGR J1550 5418）  stars neutron  gamma rays BURSTS 

分 类 号：O571.323[理学—粒子物理与原子核物理]