摘要
We have conducted a comprehensive investigation into the bright single pulse emission from PSR B1133+16using the Giant Metrewave Radio Telescope.High time resolution data(61μs)were obtained at a center frequency of 322 MHz with a bandwidth of 32 MHz over a continuous observation period of 7.45 hr.A total of 1082 bright pulses were sporadically detected with peak flux densities ranging from 10 to 23 times stronger than the average pulse profile.However,no giant pulse-like emission with a relative pulse energy larger than 10 and extremely short duration was detected,indicating that these bright pulses cannot be categorized as giant pulse emission.The majority of these bright pulses are concentrated in pulse phases at both the leading and trailing windows of the average pulse profile,with an occurrence ratio of approximately 2.74.The pulse energy distribution for all individual pulses can be described by a combination of two Gaussian components and a cutoff power-law with an index of α=-3.2.An updated nulling fraction of 15.35%±0.45% was determined from the energy distribution.The emission of individual pulses follows a log-normal distribution in peak flux density ratio.It is imperative that regular phase drifting in bright pulse sequence is identified in both the leading and trailing components for the first time.Possible physical mechanisms are discussed in detail to provide insights into these observations.
基金
supported by the open project of the Key Laboratory in Xinjiang Uygur Autonomous Region of China(No.2023D04058)
the Major Science and Technology Program of Xinjiang Uygur Autonomous Region(No.2022A03013-1)
the National Key Research and Development Program of China(No.2022YFC2205203)
the National Natural Science Foundation of China(NSFC,Grant Nos.12303053,12288102,11988101,U1838109,12041304,12041301,11873080,12133004,12203094 and U1631106)
the Chinese Academy of Sciences Foundation of the young scholars of western(No.2020XBQNXZ-019)
the National SKA Program of China(2020SKA0120100)
Z.G.W.is supported by the Tianshan Talent Training Program(NO.2023TSYCCX0100)
2021 project Xinjiang Uygur autonomous region of China for Tianshan elites
the Youth Innovation Promotion Association of CAS under No.2023069
J.L.C.is supported by the Natural Science Foundation of Shanxi Province(20210302123083)
H.W.is supported by the Scientific
Technological Innovation Programs of Higher Education Institutions in Shanxi(grant No.2021L480)
W.M.Y.is supported by the CAS Jianzhihua project
H.G.W.is supported by the 2018 project of Xinjiang Uygur autonomous region of China for flexibly fetching in upscale talents
W.H.is supported by the CAS Light of West China Program No.2019-XBQNXZ-B-019。
