A discovery of two slow pulsars with FAST:“Ronin”from the globular cluster M15

作     者：Dengke Zhou Pei Wang Di Li Jianhua Fang Chenchen Miao Paulo CCFreire Lei Zhang Dandan Zhang Huaxi Chen Yi Feng Yifan Xiao Jintao Xie Xu Zhang Chenwu Jin Han Wang Yinan Ke Xuerong Guo Rushuang Zhao Chenhui Niu Weiwei Zhu Mengyao Xue Yabiao Wang Jiafu Wu Zhenye Gan Zhongyi Sun Chengjie Wang Jie Zhang Junshuo Zhang Jinhuang Cao Wanjin Lu 

作者机构：Research Center for Astronomical ComputingZhejiang LaboratoryHangzhou 311121China National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Institute for Frontiers in Astronomy and AstrophysicsBeijing Normal UniversityBeijing 102206China University of Chinese Academy of SciencesBeijing 100049China New Cornerstone Science LaboratoryShenzhen 518054China Max Planck Institut f¨ur RadioastronomieBonn 53121Germany Centre for Astrophysics and SupercomputingSwinburne University of TechnologyHawthorn 3122Australia School of Mathematical SciencesSchool of Physics and Electronic SciencesGuizhou Normal UniversityGuiyang 550001China Guizhou Provincial Key Laboratory of Radio Astronomy and Data ProcessingGuiyang 550001China School of Physics and Electronic EngineeringQilu Normal UniversityJinan 250200China School of Physics and Electronic ScienceGuizhou Normal UniversityGuiyang 550001China College of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079China Tencent Youtu LabShanghai 201103China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2024年第67卷第6期

页      面：166-180页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11988101,12103013,12041303,U2031117,12373109,and 12103069) the National SKA Program of China(Grant Nos.2020SKA0120200,2022SKA0130100,and2022SKA0130104) the National Key Research and Development Program of China(Grant No.2023YFB4503300) the Foundation of Science and Technology of Guizhou Province(Grant No.(2021)023) the Foundation of Guizhou Provincial Education Department(Grant Nos.KY(2020)003,and KY(2023)059)。 

主　　题：pulsar globular cluster FAST 

摘      要：Globular clusters harbor numerous millisecond pulsars,but long-period pulsars(P 100 ms)are rarely found.In this study,we employed a fast folding algorithm to analyze observational data from multiple globular clusters obtained by the Five-hundredmeter Aperture Spherical radio Telescope(FAST),aiming to detect the existence of long-period pulsars.We estimated the impact of the median filtering algorithm in eliminating red noise on the minimum detectable flux density(S_(min))of pulsars.Subsequently,we successfully discovered two isolated long-period pulsars in M15 with periods approximately equal to 1.928451 and3.960716 s,respectively.On the P-˙P diagram,both pulsars are positioned below the spin-up line,suggesting a possible history of partial recycling in X-ray binary systems disrupted by dynamical encounters later on.According to timing results,these two pulsars exhibit remarkably strong magnetic fields.If the magnetic fields were weakened during the accretion process,then a short duration of accretion might explain the strong magnetic fields of these pulsars.