Three pulsars discovered by FAST in the globular cluster NGC 6517 with a pulsar candidate sifting code based on dispersion measure to signal-to-noise ratio plots  

作　　者：Zhichen Pan Xiao-Yun Ma Lei Qian Lin Wang Zhen Yan Jin-Tao Luo Scott M.Ransom Duncan R.Lorimer Peng Jiang 潘之辰;马晓耘;钱磊;王琳;闫振;罗近涛;Scott M.Ransom;Duncan R.Lorimer;姜鹏(National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;CAS Key Laboratory of FAST,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;College of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 20030,China;National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;National Radio Astronomy Observatory,Charlottesville,VA 22903,USA;Department of Physics and Astronomy,West Virginia University,Morgantown,WV 26506,USA;Center for Gravitational Waves and Cosmology,West Virginia University,Chestnut Ridge Research Building,Morgantown,WV 26505,USA)

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]CAS Key Laboratory of FAST,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [3]College of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [4]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 20030,China [5]National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China [6]National Radio Astronomy Observatory,Charlottesville,VA 22903,USA [7]Department of Physics and Astronomy,West Virginia University,Morgantown,WV 26506,USA [8]Center for Gravitational Waves and Cosmology,West Virginia University,Chestnut Ridge Research Building,Morgantown,WV 26505,USA

出　　处：《Research in Astronomy and Astrophysics》2021年第6期314-320,共7页天文和天体物理学研究（英文版）

基　　金：supported by the Basic Science Center Project of the National Natural Science Foundation of China(NSFC,Grant Nos.11703047,11773041 and U2031119);supported by the CAS“Light of West China”Program;supported by the Youth Innovation Promotion Association of CAS(id.2018075);supported by the NSF Physics Frontiers Center award 1430284。

摘　　要：We report the discovery of three new pulsars in the globular cluster(GC)NGC 6517,namely NGC 6517 E,F and G,made with the Five-hundred-meter Aperture Spherical radio Telescope(FAST).The spin periods of NGC 6517 E,F and G are 7.60 ms,24.89 ms and 51.59 ms,respectively.Their dispersion measures are 183.29,183.713 and 185.3 pc cm^(-3),respectively,all slightly larger than those of the previously known pulsars in this cluster.The spin period derivatives are at the level of 1×10^(-18) s s^(-1),which suggests these are recycled pulsars.In addition to the discovery of these three new pulsars,we updated the timing solutions of the known isolated pulsars,NGC 6517 A,C and D.The solutions are consistent with those from Lynch et al.but with smaller timing residuals.From the timing solution,NGC6517 A,B(position from Lynch et al.),C,E and F are very close to each other on the sky and only a few arcseconds from the optical core of NGC 6517.With currently published and unpublished discoveries,nine pulsars have been discovered in NGC 651,ranking it 6 thfor GCs with the most known pulsars.The discoveries take advantage of the high sensitivity of FAST and a new algorithm used to check and filter possible candidate signals.

关 键 词：Pulsar-Globular Clusters Individual NGC 6517-methods analytical-surveys-FAST 

分 类 号：P145.6[天文地球—天体物理]