脉冲星PSRJ1224−6407的偏振、频谱和到达时间的研究

Study on polarization,spectrum and arrival time of PSR J1224−6407

使用澳大利亚帕克斯射电望远镜对PSR J1224−6407进行了3个波段的研究,观测数据的时间跨度约10 a.3个波段观测中心频率分别为732、1369 MHz和3100 MHz.将测量得到的流量密度与文献中的频谱数据相结合,得出脉冲星的频谱特性.用简单的幂律谱模型对频谱进行了拟合,得到谱指数为−1.45.用PSRCHIVE软件得到3个频率下平均脉冲轮廓和偏振观测结果,脉冲总强度、圆偏振、线偏振和偏振位置角曲线随频率表现出了不同的变化.在1.4 GHz的频率下,分析了脉冲星的计时残差,更新了脉冲星的位置、自转周期和周期导数等基本参数.

We conducted a study of PSR J1224−6407 at three frequency bands using the Parkes radio telescope in Australia,with a time span of about 10 years.The central frequencies of the three bands are 732 MHz,1369 MHz,and 3100 MHz,respectively.By combining the measured flux densities with spectral data from literature,we derived the spectral characteristics of the pulsar.A simple power-law spectrum model was used to fit the spectrum,resulting in a spectral index of−1.45.The average pulse profiles and polarization observations at the three frequencies were obtained using the PSRCHIVE software.The total intensity,circular polarization,linear polarization,and polarization position angle curves exhibited different variations with frequency.At the frequency of 1.4 GHz,we analyzed the timing residuals of the pulsar and updated its basic parameters such as position,rotation period,and period derivative.