On the distributions of pulsar glitch sizes and the inter-glitch time intervals

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2019,（6）
• 页码范围: 137-144
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/19/6/89

摘要

The glitch size,△v/v,inter-glitch time interval,ti,and frequency of glitches in pulsars are key parameters in discussing glitch phenomena.In this paper,the glitch sizes and inter-glitch time intervals are statistically analyzed in a sample of 168 pulsars with a total of 483 glitches.The glitches are broadly divided into two groups.Those with △v/v ＜ 10-7 are regarded as small size glitches,while those with △v/v ≥ 10-7 are considered as relatively large size glitches.In the ensemble of glitches,the distribution of △v/v is seen to be bimodal as usual.The distribution of inter-glitch time intervals is unimodal and the interglitch time intervals between small and large size glitches are not significantly different from each other.This observation shows that inter-glitch time intervals are size independent.In addition,the distribution of the ratio △v/v:ti in both small and large size glitches has the same pattern.This observation suggests that a parameter which depends on time,which could be the spin-down rate of a pulsar,plays a similar role in the processes that regulate both small and large size glitches.Equally,this could be an indication that a single physical mechanism,which could produce varying glitch sizes at similar time-intervals,could be responsible for both classes of glitch sizes.