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arXiv 0807.5013astro-ph
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双极脉冲星的高精度几何学

High-precision geometry of a double-pole pulsar

M. Kramer, S. Johnston

摘要:

PSR B 0906 -49(或PSR J 0908 -4913)在宽频率范围内的高时间分辨率观测使我们能够确定脉冲星的几何形状和光束形状。我们已经使用了位置角导线来确定旋转矢量模型的高度约束解,这最终表明PSR B 0906 -49是一个正交旋转体。测量几何形状所获得的精度是前所未有的。如果脉冲星被GLAST探测到,这可能允许测试高能发射模型。虽然碰撞参量β似乎与频率有关,但我们已经证明这是由于星际散射的影响。因此,这颗脉冲星提供了一些最有力的证据,证明位置角摆动确实与几何原点有关,至少对于非回收的脉冲星来说是这样。我们表明,PSR B 0906 -49中主脉冲和间脉冲的光束结构非常相似。发射来自~230 km的高度,并且与位于最后一个开放场线的一半处的斑片状圆锥体的起源一致。脉冲星的旋转轴和运动方向似乎是一致的。

英文摘要:

High time resolution observations of PSR B0906-49 (or PSR J0908-4913) over a wide range of frequencies have enabled us to determine the geometry and beam shape of the pulsar. We have used the position angle traverse to determine highly-constrained solutions to the rotating vector model which show conclusively that PSR B0906-49 is an orthogonal rotator. The accuracy obtained in measuring the geometry is unprecedented. This may allow tests of high-energy emission models, should the pulsar be detected with GLAST. Although the impact parameter, beta, appears to be frequency dependent, we have shown that this is due to the effect of interstellar scattering. As a result, this pulsar provides some of the strongest evidence yet that the position angle swing is indeed related to a geometrical origin, at least for non-recycled pulsars. We show that the beam structures of the main pulse and interpulse in PSR B0906-49 are remarkably similar. The emission comes from a height of ~230 km and is consistent with originating in a patchy cone located about half way to the last open field lines. The rotation axis and direction of motion of the pulsar appear to be aligned.

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