摘要
年轻脉冲星PSR J0614+2229是少数模式变换时发生相位偏移的脉冲星之一。利用帕克斯(Parkes)射电天文台的10cm,20cm和50cm 3个波段的偏振观测数据,对每个波段爆发模式和正常模式的线偏振位置角用旋转矢量模型进行拟合,确定了其最大斜率点的相位差。进而利用广泛使用的确定辐射高度的相对论性方法,首次得到了模式变换时辐射高度的变化,发现正常模式的辐射位置高于爆发模式,高度差随着频率增加而扩大。根据两个模式累积脉冲窗口中心的相位差,可以推断两个模式的辐射区并不都关于磁轴-自转轴所在子午面对称。
The young pulsar PSR J0614+2229 is one of a few known pulsars with phase offset during mode switching.With the polarimetry data at 10cm,20cm and 50cm archived at Parkes Observatory,we employ the Rotating Vector Model to fit the linear polarization position angle data for the burst and normal modes at each frequency and obtained the phases offsets between the steepest slope-rate points of best-fit curve.Using the relativistic method that is widely used to determine the emission altitude,we firstly calculate the difference between the emission altitudes of the two modes.It is found that the emission altitude of the normal mode is higher than that of the burst mode,and the difference increases with frequency.On the basis of the phase offset between the centers of the averaged pulse windows of the two modes,it is inferred that the emission regions of the two modes should not be symmetric,in the same time,about the meridian plane that contains the rotation and magnetic axes of the pulsar.
作者
张颜荣
陈建玲
王洪光
黄秀健
Zhang Yanrong;Chen Jianling;Wang Hongguang;Huang Xiujian(Guangzhou University,Guangzhou 510006,China;Yuncheng University,Yuncheng 044000,China;Central China Normal University,Wuhan 430079,China)
出处
《天文研究与技术》
CSCD
2020年第1期13-20,共8页
Astronomical Research & Technology
基金
国家自然科学基金(11178001,11573008,U1631106,11573059)
运城学院博士启动基金(YQ-2014013)资助.
