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arXiv 2302.08844astro-ph.HE
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偏振位置角无序分布的PSR J1645 $-$ 0317中相干曲率辐射的证据

Evidence for Coherent Curvature Radiation in PSR J1645$-$0317 with Disordered Distribution of Polarization Position Angle

Dipanjan Mitra, George I. Melikidze, Rahul Basu

摘要:

不同的偏振特性在恒星中是冲突的,应用一个独特的发射机制的人口。极化位置角(PPA)在大多数类星体中呈S形曲线,可以用旋转矢量模型(RVM)解释为射电辐射平行或垂直于发散磁场线,并认为强磁化对等离子体中电荷束的相干曲率辐射机制。然而,在一个子集的卫星的无线电发射显着去极化和PPA显示了一个复杂的模式,不能解释使用RVM。我们建议,即使在这种情况下,在单脉冲的高度极化的时间样本应该遵循RVM可能有两个平行的轨道分开90 \degr。我们研究了PSR J1645 $-$ 0317,具有复杂的PPA遍历,并首次证明,仅考虑单脉冲中的高度极化时间样本,PPA分布明显遵循RVM。我们的结论是,这强烈有利于相干曲率辐射机制是普遍适用的脉冲星人口。

英文摘要:

The diverse polarization properties in pulsars are in conflict with applying a unique emission mechanism to the population. The polarization position angle (PPA) traverse in most pulsars shows a S-shaped curve that can be interpreted using the rotating vector model (RVM) as the radio emission being directed either parallel or perpendicular to the divergent magnetic field lines and argues for a coherent curvature radiation mechanism from charge bunches in a strongly magnetized pair plasma. However, in a subset of pulsars the radio emission is significantly depolarized and the PPA shows a complex pattern which cannot be explained using RVM. We propose that even in such cases the highly polarized time samples in the single pulses should follow the RVM with possibly two parallel tracks separated by 90\degr. We have investigated PSR J1645$-$0317, with complex PPA traverse, and demonstrated for the first time that considering only the highly polarized time samples in the single pulses, the PPA distribution clearly follows the RVM. We conclude that this strongly favour the coherent curvature radiation mechanism to be universally applicable in the pulsar population.

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