论文标题
将施瓦茨柴尔斯柴尔德近似施加了迅速旋转中子星的极化辐射的近似
Oblate Schwarzschild approximation for polarized radiation from rapidly rotating neutron stars
论文作者
论文摘要
我们已经开发了一个完整的理论，用于计算使用扁平的schwarzschild近似值从快速旋转中子星（NS）发出的辐射的观察到的Stokes参数。我们考虑了从恒星表面到观察者的相对论效应引起的极化平面的旋转。结果证明，通过使用\ textsc {arcmancer}代码执行完整的数值相对论射线追踪获得的结果是一致的。我们表明，所获得的极化角（PA）曲线可能与球形恒星衍生的曲线有很大不同。我们证明，在拟合极化数据时，假设恒星的形状不正确会导致NS参数的偏差约束。使用简化的模型，我们还粗略地估计了如何使用即将到来的极性计的X射线极化测量值（例如Imaging X射线偏光仪（IXPE））或增强的X射线时间和极性计（Extp）任务的X射线极化测量值确定的几何参数。
We have developed a complete theory for the calculation of the observed Stokes parameters for radiation emitted from the surface of a rapidly rotating neutron star (NS) using the oblate Schwarzschild approximation. We accounted for the rotation of the polarization plane due to relativistic effects along the path from the stellar surface to the observer. The results were shown to agree with those obtained by performing full numerical general relativistic ray-tracing with the \textsc{arcmancer} code. We showed that the obtained polarization angle (PA) profiles may differ substantially from those derived for a spherical star. We demonstrated that assuming incorrect shape for the star can lead to biased constraints for NS parameters when fitting the polarization data. Using a simplified model, we also made a rough estimate of how accurately the geometrical parameters of an accreting NS can be determined using the X-ray polarization measurements of upcoming polarimeters like the Imaging X-ray Polarimeter Explorer (IXPE) or the enhanced X-ray Timing and Polarimetry (eXTP) mission.
