We report the discovery of an isolated millisecond pulsar M15O(J2129+1210O)from the globular cluster M15(NGC 7078)with a period of 11.06686 ms and a dispersion measure of~67.44 cm^(-3)pc.Its spin period is so close to...We report the discovery of an isolated millisecond pulsar M15O(J2129+1210O)from the globular cluster M15(NGC 7078)with a period of 11.06686 ms and a dispersion measure of~67.44 cm^(-3)pc.Its spin period is so close to the 10th harmonic of the bright pulsar M15A(~11.06647 ms)that it was missed in a previous pulsar search.We suggest adding the spectrum in the pulsar candidate diagnostic plot to identify new signals near the harmonics.M15O has the first spin frequency derivative and the second spin frequency derivative,being 1.79191(5)×10^(-14)Hz s^(-1)and 3.3133(6)×10^(-23)Hz s^(-2),respectively.Its projected distance from the optical center of M15 is the closest among all the pulsars in M15.The origin can be something from the center of the massive and core-collapsed globular cluster M15.展开更多
本文采用小波变化分别对受磁扰时段的"天宫一号"大气质谱信号和乌鲁木齐台地磁FHDZ-M15秒数据进行频段分析.实验发现"天宫一号"大气质谱信号和地磁M15秒数据信号的频谱优势频段在0.005~0.025 Hz之内,其中主要受干...本文采用小波变化分别对受磁扰时段的"天宫一号"大气质谱信号和乌鲁木齐台地磁FHDZ-M15秒数据进行频段分析.实验发现"天宫一号"大气质谱信号和地磁M15秒数据信号的频谱优势频段在0.005~0.025 Hz之内,其中主要受干扰的频段为0.01~0.02 Hz.在地磁M15秒数据的预处理数据中,将H分量和F分量的主要磁扰频段滤出,实验结果表明:含有主要磁扰频段的H分量和F分量SNR(信噪比)分别为37.17 d B和32.99 d B,滤出空间主要磁扰频段后的H分量和F分量SNR分别为215.71 d B和245.54 d B,SNR有了很大的提高.地磁M15秒数据信号有了较为明显的改善,提高地磁资料对于地震监控的应用效果.展开更多
基金supported by the National Key R&D Program of China No.2022YFC2205202,No.2020SKA0120100the National Natural Science Foundation of China(NSFC,grant Nos.12373032,12003047,11773041,U2031119,12173052,and 12173053)+2 种基金supported by the Youth Innovation Promotion Association of CAS(id.2018075,Y2022027 and 2023064)the CAS“Light of West China”Programsupported by the Science and Technology Program of Guizhou Province under project No.QKHPTRC-ZDSYS[2023]003 and QKHFQ[2023]003。
文摘We report the discovery of an isolated millisecond pulsar M15O(J2129+1210O)from the globular cluster M15(NGC 7078)with a period of 11.06686 ms and a dispersion measure of~67.44 cm^(-3)pc.Its spin period is so close to the 10th harmonic of the bright pulsar M15A(~11.06647 ms)that it was missed in a previous pulsar search.We suggest adding the spectrum in the pulsar candidate diagnostic plot to identify new signals near the harmonics.M15O has the first spin frequency derivative and the second spin frequency derivative,being 1.79191(5)×10^(-14)Hz s^(-1)and 3.3133(6)×10^(-23)Hz s^(-2),respectively.Its projected distance from the optical center of M15 is the closest among all the pulsars in M15.The origin can be something from the center of the massive and core-collapsed globular cluster M15.
文摘本文采用小波变化分别对受磁扰时段的"天宫一号"大气质谱信号和乌鲁木齐台地磁FHDZ-M15秒数据进行频段分析.实验发现"天宫一号"大气质谱信号和地磁M15秒数据信号的频谱优势频段在0.005~0.025 Hz之内,其中主要受干扰的频段为0.01~0.02 Hz.在地磁M15秒数据的预处理数据中,将H分量和F分量的主要磁扰频段滤出,实验结果表明:含有主要磁扰频段的H分量和F分量SNR(信噪比)分别为37.17 d B和32.99 d B,滤出空间主要磁扰频段后的H分量和F分量SNR分别为215.71 d B和245.54 d B,SNR有了很大的提高.地磁M15秒数据信号有了较为明显的改善,提高地磁资料对于地震监控的应用效果.
