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
We report on high-sensitivity polarization measurements of the rotating radio transient(RRAT)J2325-0530conducted with the Five-hundred-meter Aperture Spherical radio Telescope.Using single-pulse search techniques and ...We report on high-sensitivity polarization measurements of the rotating radio transient(RRAT)J2325-0530conducted with the Five-hundred-meter Aperture Spherical radio Telescope.Using single-pulse search techniques and full-Stokes parameter analysis,we comprehensively explore the source s emission characteristics.The observations reveal three distinct pulse profile types—single-peaked,double-peaked,and multi-peaked—with the multi-peaked category displaying prominent polarization reversals(mean linear polarization fraction of 27.5%±0.3%)and broader pulse widths(7.50±0.82).The relative pulse energy distribution follows a power-law trend and exhibits a strong positive correlation with pulse width(r=0.80).Through analysis of orthogonal polarization mode transitions,we suggest that the emission likely results from the interplay of multiscale magnetospheric processes in the polar cap region.Future multi-wavelength campaigns could further test the distinctiveness of this source's emission mechanism.Overall,our findings enhance the current understanding of RRATs'complex emission behavior and inform the broader study of pulsar magnetospheric dynamics.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.
基金supported by the National Key Research and Development Program of China(No.2022YFC2205202)the National Natural Science Foundation of China(NSFC,Basic Science Center Program,grant No.12288102)+3 种基金the NSFC(FAST Special Project,grant No.12041304)the"Tianshan Talent Program"Team Project of the Xinjiang Uygur Autonomous Region(Project No.2023TSYCTD0013)the Guizhou Provincial Science and Technology Projects(No.QKHFQ[2023]003 and No.QKHPTRC-ZDSYS[2023]003)the NSFC(grant No.12373114)。
文摘We report on high-sensitivity polarization measurements of the rotating radio transient(RRAT)J2325-0530conducted with the Five-hundred-meter Aperture Spherical radio Telescope.Using single-pulse search techniques and full-Stokes parameter analysis,we comprehensively explore the source s emission characteristics.The observations reveal three distinct pulse profile types—single-peaked,double-peaked,and multi-peaked—with the multi-peaked category displaying prominent polarization reversals(mean linear polarization fraction of 27.5%±0.3%)and broader pulse widths(7.50±0.82).The relative pulse energy distribution follows a power-law trend and exhibits a strong positive correlation with pulse width(r=0.80).Through analysis of orthogonal polarization mode transitions,we suggest that the emission likely results from the interplay of multiscale magnetospheric processes in the polar cap region.Future multi-wavelength campaigns could further test the distinctiveness of this source's emission mechanism.Overall,our findings enhance the current understanding of RRATs'complex emission behavior and inform the broader study of pulsar magnetospheric dynamics.
