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arXiv 2607.04083astro-ph.HE
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通过多波长建模约束脉冲星辐射几何

Constraining Pulsar Radiative Geometry via Multi-wavelength Modeling

School of Physics, Peking University(北京大学物理学院)

Tong Zhao, Shunshun Cao, Renxin Xu

AI总结:

研究提出联合对热X射线脉冲轮廓和偏振位置角建模来定位脉冲星相干辐射偏振方向焦点。用X射线脉冲轮廓测量约束热X射线发射中心余纬,RVM拟合得偏振方向焦点倾角,两者一致性可验证相关假设,反之则暗示射电发射偏振态传播中变化。

摘要:

我们提出,对热X射线脉冲轮廓和偏振位置角进行联合建模,为定位脉冲星相干辐射的偏振方向焦点提供了一种有效方法。通过X射线脉冲轮廓测量,我们约束了热X射线发射中心的余纬,它对应于极冠内下落粒子的中心,而RVM拟合得出偏振方向焦点的倾角。因此,这两个独立角度测量之间的一致性意味着RVM拟合忠实地恢复了等离子体流中心的倾角,并且这个中心与偏振方向焦点重合。相反,差异将表明射电发射的偏振状态在传播过程中发生变化,因为磁层中波传播期间波模式的演化强烈依赖于磁场方向。

英文摘要:

We propose that jointly modeling the thermal X-ray pulse profiles and the polarization position angles offers an effective means of locating the polarization orientation focus of the pulsar's coherent radiation. From the X-ray pulse-profile measurement we constrain the colatitude of the center of the thermal X-ray emission, which corresponds to the center of in-falling particles within the polar cap, while the RVM fitting yields the inclination angle of the focus point of polarization orientations. Thus, consistency between these two independent angle measurements would imply that the RVM fit faithfully recovers the inclination of the plasma flow center, and this center coincides with the polarization orientation focus. Conversely, the discrepancy would suggest that the polarization state of the radio emission changes as it propagates because the evolution of wave modes during wave propagation in the magnetosphere strongly depends on magnetic field orientations.

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