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arXiv astro-ph/0209021astro-ph
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Gamma-Ray脉冲星

Gamma-Ray Pulsars

Gottfried Kanbach

摘要:

来自年轻脉冲星的伽马射线光子使我们能够最深入地了解脉冲星磁层中高能粒子与磁场和光子场的性质和相互作用。康普顿伽马射线天文台的测量已经探测到了近10颗伽马射线天体。虽然这些γ星的特征多种多样,但它们具有一些共同的特征:(1)大多数高能γ星的γ光变曲线有两个主峰,脉冲辐射覆盖了50%以上的自转,即辐射束较宽;(2)类星体的γ射线谱是硬谱(幂律指数小于2),通常在1GeV附近有一个最大亮度。发现了几个GeV以上的光谱截止;(3)光谱随旋转相位而变化,表明不同的发射地点;(4)伽马光度与磁层开放区域的粒子通量(Goldreich-Julian电流)成比例。

英文摘要:

Gamma-ray photons from young pulsars allow the deepest insight into the properties and interactions of high-energy particles with magnetic and photon fields in a pulsar magnetosphere. Measurements with the Compton Gamma-Ray Observatory have led to the detection of nearly ten gamma-ray pulsars. Although quite a variety of individual signatures is found for these pulsars, some general characteristics can be summarized: (1) the gamma-ray lightcurves of most high-energy pulsars show two major peaks with the pulsed emission covering more than 50% of the rotation, i.e. a wide beam of emission; (2) the gamma-ray spectra of pulsars are hard (power law index less than 2), often with a luminosity maximum around 1 GeV. A spectral cutoff above several GeV is found; (3) the spectra vary with rotational phase indicating different sites of emission; and (4) the gamma-luminosity scales with the particle flux from the open regions of the magnetosphere (Goldreich-Julian current).

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