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arXiv 2107.08205astro-ph.HE
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重复快速射电暴源的双峰爆发能量分布

A bimodal burst energy distribution of a repeating fast radio burst source

D. Li, P. Wang, W. W. Zhu, B. Zhang, X. X. Zhang, R. Duan, Y. K. Zhang, Y. Feng, N. Y. Tang, S. Chatterjee, J. M. Cordes, M. Cruces, S. Dai, V. Gajjar, G. Hobbs… 展开作者

D. Li, P. Wang, W. W. Zhu, B. Zhang, X. X. Zhang, R. Duan, Y. K. Zhang, Y. Feng, N. Y. Tang, S. Chatterjee, J. M. Cordes, M. Cruces, S. Dai, V. Gajjar, G. Hobbs, C. Jin, M. Kramer, D. R. Lorimer, C. C. Miao, C. H. Niu, J. R. Niu, Z. C. Pan, L. Qian, L. Spitler, D. Werthimer, G. Q. Zhang, F. Y. Wang, X. Y. Xie, Y. L. Yue, L. Zhang, Q. J. Zhi, Y. Zhu

摘要:

重复快速射电暴(FRB)的事件率、能量分布和时域行为包含了关于其物理性质和中心引擎的重要信息,这些信息至今仍是未知的。作为第一个精确定位的源,FRB 121102已被广泛观察到,并显示出随时间的非泊松集群的爆发和幂律能量分布。然而,能量向暗端的分布程度尚不清楚。在这里,我们报告了1652个独立的突发检测的峰值突发率为122小时^{-1},在59.5小时跨越47天。在各向同性的等效能量分布的峰值被发现在1.25~GHz处为~4.8 × 10^{37} erg,低于该峰值,爆发的检测被抑制。爆发的能量分布是双峰的,以及其特征在于由一个对数正态函数和广义柯西函数的组合。在长达一小时的跨度内的大量突发允许在1 ms和1000 s之间进行敏感的周期性搜索。没有检测到任何周期性或准周期性的模型,涉及一个单一的旋转紧凑的对象提出了挑战。高爆发率还意味着FRB必须以高辐射效率产生,不利于具有大能量需求或人为触发条件的发射机制。

英文摘要:

The event rate, energy distribution, and time-domain behaviour of repeating fast radio bursts (FRBs) contains essential information regarding their physical nature and central engine, which are as yet unknown. As the first precisely-localized source, FRB 121102 has been extensively observed and shows non-Poisson clustering of bursts over time and a power-law energy distribution. However, the extent of the energy distribution towards the fainter end was not known. Here we report the detection of 1652 independent bursts with a peak burst rate of 122~hr^{-1}, in 59.5 hours spanning 47 days. A peak in the isotropic equivalent energy distribution is found to be ~4.8 x 10^{37} erg at 1.25~GHz, below which the detection of bursts is suppressed. The burst energy distribution is bimodal, and well characterized by a combination of a log-normal function and a generalized Cauchy function. The large number of bursts in hour-long spans allow sensitive periodicity searches between 1 ms and 1000 s. The non-detection of any periodicity or quasi-periodicity poses challenges for models involving a single rotating compact object. The high burst rate also implies that FRBs must be generated with a high radiative efficiency, disfavoring emission mechanisms with large energy requirements or contrived triggering conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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