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arXiv 1812.00526astro-ph.HE
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曲率辐射的几何性质及其对亚脉冲漂移的影响

On the Geometry of Curvature Radiation and Implications for Subpulse Drifting

S. J. McSweeney, N. D. R. Bhat, S. E. Tremblay, A. A. Deshpande, G. Wright

摘要:

亚脉冲漂移的现象提供了独特的见解发射几何的恒星,通常被解释为一个旋转的“火花”事件在恒星表面附近的旋转木马。我们开发了一个详细的几何模型的发射列以上的旋转木马的火花,这是完全计算在观察者的惯性系,这是一致的,以及理解的旋转效应的像差和延迟。我们探讨了该模型的观测结果,包括(1)通过制图变换重建光束图案的外观和(2)漂移带的形态以及它们如何作为频率的函数演变。该模型,这是在软件包PSRGEOM中实现的,是适用于各种各样的观看几何形状,我们说明其影响使用PSR B0809+74和B2034+19为例。对亚脉冲演化与微结构演化的差异进行了具体的预测,为进一步检验模型提供了依据。

英文摘要:

The phenomenon of subpulse drifting offers unique insights into the emission geometry of pulsars, and is commonly interpreted in terms of a rotating carousel of "spark" events near the stellar surface. We develop a detailed geometric model for the emission columns above a carousel of sparks that is entirely calculated in the observer's inertial frame, and which is consistent with the well-understood rotational effects of aberration and retardation. We explore the observational consequences of the model, including (1) the appearance of the reconstructed beam pattern via the cartographic transform and (2) the morphology of drift bands and how they might evolve as a function of frequency. The model, which is implemented in the software package PSRGEOM, is applicable to a wide range of viewing geometries, and we illustrate its implications using PSRs B0809+74 and B2034+19 as examples. Some specific predictions are made with respect to the difference between subpulse evolution and microstructure evolution, which provides a way to further test our model.

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