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arXiv 1910.04550astro-ph.HEastro-ph.SR
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脉冲间辐射射电望远镜的束流特性

On the beam properties of radio pulsars with interpulse emission

Simon Johnston, Michael Kramer

摘要:

在恒星的典型图像中,无线电辐射来自于一个以恒星磁轴为中心的狭窄圆锥体,但许多基本细节仍然不清楚。我们使用高质量的偏振数据与帕克斯射电望远镜约束的几何形状和发射高度的脉冲间发射的恒星,并包括在主和脉冲间的发射高度可能是不同的可能性。我们表明,发射高度是低的光束的中心,通常小于3%的光圆柱半径。发射光束在纵向上填充不足,平均轮廓宽度仅为最大光束宽度的60%,并且强烈偏好可见光发射位于光束的尾部。我们显示出大量的证据表明,发射高度是较大的光束边缘比在光束中心。有一些迹象表明,扇形发射光束比锥形结构更好地解释了数据。最后,在主脉冲和脉冲间轮廓中的圆偏振的手性之间存在强相关性,这意味着圆偏振的手性由可见光发射的半球决定。

英文摘要:

In the canonical picture of pulsars, radio emission arises from a narrow cone centered on the star's magnetic axis but many basic details remain unclear. We use high-quality polarization data taken with the Parkes radio telescope to constrain the geometry and emission heights of pulsars showing interpulse emission, and include the possibility that emission heights in the main and interpulse may be different. We show that emission heights are low in the centre of the beam, typically less than 3\% of the light cylinder radius. The emission beams are under-filled in longitude, with an average profile width only 60% of the maximal beam width and there is a strong preference for the visible emission to be located on the trailing part of the beam. We show substantial evidence that the emission heights are larger at the beam edges than in the beam centre. There is some indication that a fan-like emission beam explains the data better than conal structures. Finally, there is a strong correlation between handedness of circular polarization in the main and interpulse profiles which implies that the hand of circular polarization is determined by the hemisphere of the visible emission.

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