Quantifying the randomness and scale invariance of the repeating fast radio bursts

被引:2
作者
Sang, Yu [1 ]
Lin, Hai-Nan [2 ,3 ]
机构
[1] Yangzhou Univ, Coll Phys Sci & Technol, Ctr Gravitat & Cosmol, Yangzhou 225009, Peoples R China
[2] Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China
[3] Chongqing Univ, Chongqing Key Lab Strongly Coupled Phys, Chongqing 401331, Peoples R China
关键词
methods: statistical; radio continuum: transients; fast radio bursts; SELF-ORGANIZED CRITICALITY; LONG-RANGE DEPENDENCE; HOST GALAXY; FRB; 121102; APPROXIMATE ENTROPY; ENERGY; SAMPLE; ENVIRONMENT; REDSHIFT;
D O I
10.1093/mnras/stae1873
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The statistical properties of energy and waiting time carry essential information about the source of repeating fast radio bursts (FRBs). In this paper, we investigate the randomness of energy and waiting time using four data samples from three extremely active repeating FRBs observed by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). We report the deviation from complete randomness of the burst activity using three statistics, i.e. Hurst exponent, Pincus index, and non-Gaussian probability density distribution of fluctuations. First, the Hurst exponent greater than 0.5 reveals that there is long-term memory in the time series of energy and waiting time. Second, the deviation of the Pincus index from 1.0 manifests that the time series is not completely random. Finally, the fluctuations of energy and waiting time follow the scale-invariant q-Gaussian distribution. All these statistical properties imply that, although the time series of repeating FRBs seems to be irregular, they are not completely random, similar to the features of self-organized criticality.
引用
收藏
页码:872 / 879
页数:8
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