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

被引：124

作者：

Li, D. ^{[1
,2
]}

Wang, P. ^{[1
]}

Zhu, W. W. ^{[1
]}

Zhang, B. ^{[3
]}

Zhang, X. X. ^{[1
]}

Duan, R. ^{[1
]}

Zhang, Y. K. ^{[1
,2
]}

Feng, Y. ^{[1
,2
,4
]}

Tang, N. Y. ^{[1
,5
]}

Chatterjee, S. ^{[6
,7
]}

Cordes, J. M. ^{[6
,7
]}

Cruces, M. ^{[8
]}

Dai, S. ^{[1
,4
,9
]}

Gajjar, V ^{[10
]}

Hobbs, G. ^{[4
]}

Jin, C. ^{[1
]}

Kramer, M. ^{[8
]}

Lorimer, D. R. ^{[11
,12
]}

Miao, C. C. ^{[1
,2
]}

Niu, C. H. ^{[1
]}

Niu, J. R. ^{[1
,2
]}

Pan, Z. C. ^{[1
]}

Qian, L. ^{[1
]}

Spitler, L. ^{[8
]}

Werthimer, D. ^{[10
]}

Zhang, G. Q. ^{[13
]}

Wang, F. Y. ^{[13
,14
]}

Xie, X. Y. ^{[15
]}

Yue, Y. L. ^{[1
]}

Zhang, L. ^{[1
,16
]}

Zhi, Q. J. ^{[15
,17
]}

Zhu, Y. ^{[1
]}

机构：

[1] Chinese Acad Sci, CAS Key Lab FAST, NAOC, Beijing, Peoples R China

[2] Univ Chinese Acad Sci, Beijing, Peoples R China

[3] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

[4] CSIRO Astron & Space Sci, Epping, NSW, Australia

[5] Anhui Normal Univ, Dept Phys, Wuhu, Peoples R China

[6] Cornell Univ, Cornell Ctr Astrophys & Planetary Sci, Ithaca, NY USA

[7] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[8] Max Pranck Inst Radioastron, Bonn, Germany

[9] Western Sydney Univ, Penrith, NSW, Australia

[10] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

[11] West Virginia Univ, Dept Phys & Astron, Morgantown, WV USA

[12] West Virginia Univ, Ctr Gravitat Waves & Cosmol, Morgantown, WV USA

[13] Nanjing Univ, Sch Astron & Space Sci, Nanjing, Peoples R China

[14] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing, Peoples R China

[15] Guizhou Normal Univ, Guiyang, Peoples R China

[16] Wuhan Univ, Sch Phys & Technol, Wuhan, Peoples R China

[17] Guizhou Normal Univ, Guizhou Prov Key Lab Radio Astron & Data Proc, Guiyang, Peoples R China

来源：

NATURE | 2021年 / 598卷 / 7880期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

SYNCHROTRON MASER EMISSION; PULSES; MODEL;

D O I：

10.1038/s41586-021-03878-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The event rate, energy distribution and time-domain behaviour of repeating fast radio bursts (FRBs) contain essential information regarding their physical nature and central engine, which are as yet unknown(1,2). As the first precisely localized source, FRB 121102 (refs. (3-5)) has been extensively observed and shows non-Poisson clustering of bursts over time and a power-law energy distribution(6-8). However, the extent of the energy distribution towards the fainter end was not known. Here we report the detection of 1,652 independent bursts with a peak burst rate of 122 h(-1), in 59.5 hours spanning 47 days. A peak in the isotropic equivalent energy distribution is found to be approximately 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 allows sensitive periodicity searches between 1 ms and 1,000 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, disfavouring emission mechanisms with large energy requirements or contrived triggering conditions. For FRB 121102, 1,652 burst events are detected over 47 days, with a peak burst rate of 122 per hour, a bimodal burst rate energy distribution, and no periodicity or quasi-periodicity.

引用

页码：267 / +

页数：19

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