作　　者： (王辉）; (贾焕玉）; (周霞）; (母雪玲）; (王印）; (章云龙）; (汪嘉珂）;

机构地区： 西南交通大学现代物理研究所,四川成都610031

出　　处： 《天文研究与技术》 2017年第4期407-413,共7页

摘　　要： 脉冲星参数统计是脉冲星研究的重要基础性工作。利用最新整理的脉冲星观测数据,对2 500多颗脉冲星参数的空间分布和演化进行了统计研究。结果显示,在空间上脉冲星集中在银道面附近,脉冲星数目分布的极大值位于距离银心约7.27 kpc处,这可能是星际色散和散射造成的观测效应。另外给出了自转周期、表面磁场、特征年龄和自转能损失率随着远离银道面的变化规律。随着远离银道面,常规脉冲星的自转周期和特征年龄不断增大,表面磁场和自转能损失率不断减小。常规脉冲星的射电光度随特征年龄的增大,先增大后减小,这表明射电辐射机制在不同年龄段有所不同。常规脉冲星自转能损失率随特征年龄的增大呈对数快速下降。这些结果是脉冲星分布演化理论研究的重要基础。 The statistical study of pulsar parameters is an important basic work in pulsar research field. By using the latest observational data of pulsars, the spatial distribution and time variation of the parameters of more than 2500 pulsars are studied statistically. Results show that the pulsars concentrate near the galactic plane, and the maximum value of the number distribution of pulsars is located at about 7.27kpc, which is the distance between pulsar and the center of the galaxy. This may be the observational effects of interstellar dispersion and interstellar scattering. Furthermore, with the distance away from the galactic plane, the variation law of the rotation period, surface magnetic field, characteristic age, and loss rate of rotational kinetic energy are given. The normal pulsar rotation period and characteristic age gradually increase as the distance increases, while the surface magnetic field and loss rate of rotational kinetic energy decrease. With the characteristic age increasing, the radio luminosity of the normal pulsar increases at first and then declines, which indicates that the radio emission mechanism of normal pulsar is different at different characteristic age. The loss rate of rotational kinetic energy decreases logarithmically and rapidly as the characteristic age increases. These results are important bases to the study of pulsar distribution evolution theory.

关 键 词： 脉冲星参数 空间分布 时间变化