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arXiv 0912.3845astro-ph.HE
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用Gamma-Ray光变曲线约束脉冲星磁层几何

Constraining Pulsar Magnetosphere Geometry with Gamma-Ray Light Curves

Roger W. Romani, Kyle P. Watters

摘要:

我们展示了一种方法,用于定量比较伽马射线脉冲星光变曲线与磁层聚束模型。由于费米LAT提供了许多脉冲星发现和高质量的脉冲星光变曲线,这种比较可以大大改善对发射区几何形状和磁层物理学的限制。在这里,我们将该方法应用于费米LAT光变曲线的一组明亮的恒星,因为EGRET或之前。我们测试三个近似模型的磁层结构和两个流行的计划的位置的发射区,两极焦散(TPC)模型和外间隙(OG)模型。我们发现,OG模型和相对物理的B场近似无力偶极磁层是首选在高统计意义。一个完整的LAT脉冲星样本的应用程序将使我们能够遵循发射区的演变与脉冲星自旋。

英文摘要:

We demonstrate a method for quantitatively comparing gamma-ray pulsar light curves with magnetosphere beaming models. With the Fermi LAT providing many pulsar discoveries and high quality pulsar light curves for the brighter objects, such comparison allows greatly improved constraints on the emission zone geometry and the magnetospheric physics. Here we apply the method to Fermi LAT light curves of a set of bright pulsars known since EGRET or before. We test three approximate models for the magnetosphere structure and two popular schemes for the location of the emission zone, the Two Pole Caustic (TPC) model and the Outer Gap (OG) model. We find that OG models and relatively physical B fields approximating force-free dipole magnetospheres are preferred at high statistical significance. An application to the full LAT pulsar sample will allow us to follow the emission zone's evolution with pulsar spindown.

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