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

Li, Di Li Di; Wang, Pei Wang Pei; Zhu, Weiwei Zhu Weiwei; Zhang, Bing Zhang Bing; Zhang, Xinxin Zhang Xinxin; Duan, Ran Duan Ran; Zhang, Yongkun Zhang Yongkun; Feng, Yi Feng Yi; Tang, Ningyu; Chatterjee, S. Chatterjee S.; Cordes, J. M. Cordes J. M.; Cruces, M. Cruces M.; Dai, Shi Dai Shi; Gajjar, V. Gajjar V.; Hobbs, G. Hobbs G.; Jin, C. Jin C.; Kramer, M. Kramer M.; Lorimer, D. R. Lorimer D. R.; Miao, Chenchen Miao Chenchen; Niu, Chenhui Niu Chenhui; Niu, Jiarui Niu Jiarui; Pan, Zhichen Pan Zhichen; Qian, Lei Qian Lei; Spitler, L. Spitler L.; Werthimer, D. Werthimer D.; Zhang, Guoqiang Zhang Guoqiang; Wang, Fayin Wang Fayin; Xie, Xiaoyao Xie Xiaoyao; Yue, Youling Yue Youling; Zhang, Lei Zhang Lei; Zhi, Qijun Zhi Qijun; Zhu, Yan Zhu Yan

doi:10.11922/sciencedb.01092

Cited by 1 publication

(4 citation statements)

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“…7). These pulse characteristics are comparable to the narrow-band features seen from some repeating FRBs, such as FRB 121102 (31,40). We also found that the Gaussian fit width of our detected pulses showed a median value of 0.5 ms, a mean of 0.9 ms, and an SD of 0.9 ms, while the equivalent width showed a median value of 0.5 ms, a mean value of 0.8 ms, and an SD of 0.8 ms.…”

Section: Pulse Fine Structures and Morphologysupporting

confidence: 72%

“…4). These are considered some of the predominant features of repeating FRBs (30,31,40), although some similar patterns have also been found from a small group of pulsars (41) in low frequencies. The resemblance between the single pulses of this FRB-generating magnetar and those of repeating FRBs indicates that the plasma responsible for the two types of coherent bursts might share some physical traits that are imprinted in the dynamic spectrum although the physical mechanism behind their creating might be completely different.…”

Section: Resultssupporting

confidence: 52%

“…Figure 4 shows a gallery of pulses from SGR J1935+2154 detected using FAST in October 2020. We find a variety of fine pulse structures that resembles those observed from repeating FRBs (30,31,40,60). Figure 4 (A to C) shows examples of multiple pulses arriving with separations of 5 to 10 ms.…”

Section: Pulse Fine Structures and Morphologymentioning

confidence: 68%

“…Radio pulses, conversely, originate from a fixed region in the magnetosphere (probably the open-field line region) and are powered by the standard radio pulsar mechanism. This picture could also explain why we have not yet observed any spin period from active repeating FRBs (30,31,(50)(51)(52), because the FRB bursts were emitted from a temporarily and dynamically distorted magnetosphere. Continued monitoring of SGR J1935+2154 and other Galactic magnetars in both radio and x-ray bands will further test this ansatz of the dichotomy of radio emissions from magnetars.…”

Section: Discussionmentioning

confidence: 94%

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A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism

Zhu

Zhou

et al. 2023

Sci. Adv.

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The megajansky radio burst, FRB 20200428, and other bright radio bursts detected from the Galactic source SGR J1935+2154 suggest that magnetars can make fast radio bursts (FRBs), but the emission site and mechanism of FRB-like bursts are still unidentified. Here, we report the emergence of a radio pulsar phase of the magnetar 5 months after FRB 20200428. Pulses were detected in 16.5 hours over 13 days using the Five-hundred-meter Aperture Spherical radio Telescope, with luminosities of about eight decades fainter than FRB 20200428. The pulses were emitted in a narrow phase window anti-aligned with the x-ray pulsation profile observed using the x-ray telescopes. The bursts, conversely, appear in random phases. This dichotomy suggests that radio pulses originate from a fixed region within the magnetosphere, but bursts occur in random locations and are possibly associated with explosive events in a dynamically evolving magnetosphere. This picture reconciles the lack of periodicity in cosmological repeating FRBs within the magnetar engine model.

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Section: Pulse Fine Structures and Morphologysupporting

confidence: 72%