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...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close to each other on the sky and only a few arcseconds from the optical core of NGC 6517.With currently published and unpublished discoveries,nine pulsars have been discovered in NGC 651,ranking it 6 thfor GCs with the most known pulsars.The discoveries take advantage of the high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.展开更多
Magnetic fields are pervasive throughout the Universe.They are integral to a wide array of astrophysical processes that span various physical scales and field strengths.The Galactic magnetic field,in particular,holds ...Magnetic fields are pervasive throughout the Universe.They are integral to a wide array of astrophysical processes that span various physical scales and field strengths.The Galactic magnetic field,in particular,holds significant importance in shaping the evolution of our Galaxy.However,our understanding of its behavior on small scales remains poor,especially when considering its penetration into the Galactic halo[1].展开更多
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+1 种基金supported by the Youth Innovation Promotion Association of CAS(id.2018075)supported by the NSF Physics Frontiers Center award 1430284。
文摘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.
基金supported by the National Natural Science Foundation of China(11988101,12103069,11725313,12273008,12373109,and 12203045)the National Key R&D Program of China(2017YFA0402600 and 2023YFB4503300)+4 种基金the National SKA Program of China(2022SKA0130100 and 2022SKA0130104)the Shandong Provincial Key R&D Program(2022CXGC020106)the Zhejiang Provincial grants(2023R01008 and 2024SSYS0012)Additional support came from the Pilot Project for Integrated Innovation of Science,Education and Industry of Qilu University of Technology(2022JBZ01-01)funding from NextGenerationEU under the Italian PNRR(Project IR0000034 CSTILES)。
文摘Magnetic fields are pervasive throughout the Universe.They are integral to a wide array of astrophysical processes that span various physical scales and field strengths.The Galactic magnetic field,in particular,holds significant importance in shaping the evolution of our Galaxy.However,our understanding of its behavior on small scales remains poor,especially when considering its penetration into the Galactic halo[1].
