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arXiv 1808.09762astro-ph.HE
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通过双波段光变曲线拟合促进脉冲星几何约束的统计方法的评估

Assessment of a statistical approach that facilitates the constraint of pulsar geometry via dualband light curve fitting

M. C. Bezuidenhout, C. Venter, A. S. Seyffert, A. K. Harding

摘要:

费米太空船上的大面积望远镜自2008年发射以来已经探测到200多个$γ$射线天体。通过同时将标准几何模型的光变曲线拟合到费米和射电数据上,研究人员已经限制了许多天文学家的倾角和观测角度。起初,这是通过比较观察到的和模拟的光曲线的眼睛,后来通过统计方法。我们拟合模拟光变曲线的16个恒星的无线电和$γ$射线数据,通过优化自定义的测试统计,我们已经开发了两个波段的光变曲线相结合,考虑到他们的不同的错误。我们提出了使用这个过程中发现的几何约束,并将它们与通过眼睛或使用其他统计方法发现的结果进行比较。

英文摘要:

The Large Area Telescope aboard the Fermi spacecraft has detected more than 200 $γ$-ray pulsars since its launch in 2008. By concurrently fitting standard geometric model light curves onto Fermi and radio data, researchers have constrained the inclination and observer angles of a number of pulsars. At first this was done by comparing observed and modelled light curves by eye, and later via statistical approaches. We fit modelled light curves of 16 pulsars to radio and $γ$-ray data by optimising a custom test statistic that we have developed for combining light curves across the two wavebands, taking their disparate errors into account. We present geometrical constraints found using this process, and compare them with results found by eye or using other statistical methods.

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