测量脉冲双星J1748-2446A的星际介质效应

Measuring the Interstellar Medium Effect of the Pulsar Binary Star J1748-2446A

测量掩食脉冲星发生掩食时的电子密度变化对研究脉冲星的掩食机制,辐射机制有着重要的作用。线偏振辐射经过星际介质时产生的法拉第旋转效应可以用来测量相应介质的磁场,这种方法对测量掩食脉冲双星掩食介质的磁场同样适用。法拉第旋转量是电子密度和磁场的乘积在视线方向的线性积分,因此采用这种方法进行计算时候必须考虑掩食处介质的电子密度分布。首先使用TEMPO2得到了掩食处到达时间的延迟从而计算了掩食处掩食介质的电子密度分布以及RM,并通过线偏振位置角的变化计算了掩食介质的法拉第旋转效应。

Measuring the electron density changes of eclipsed pulsars plays an important role in studying the eclipse mechanism and radiation mechanism of pulsars.The study of eclipsed pulsar binaries has the potential to provide rich information on the evolutionary history of isolated millisecond pulsars and the relativistic stellar wind and pulsar radiation mechanisms of ordinary pulsars.The Faraday rotation effect generated when the linearly polarized radiation passes through the interstellar medium can be used to measure the magnetic field of the corresponding medium.The Faraday rotation is the linear integral of the product of the electron density and the magnetic field in the line-of-sight direction.Therefore,the electron density distribution of the medium at the shelter must be considered when calculating with this method.TEMPO2 is used to obtain the delay of the arrival time of the occulter at first,and then the electron density distribution and RM of the occulter are calculated,and the Faraday rotation effect of the occulter is calculated through the change of the linear polarization position angle.