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arXiv 1001.4540astro-ph.HEastro-ph.GAhep-ph
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费米Gamma-Ray脉冲星对Cosmic-Ray电子和正电子局域通量的贡献

The Contribution of Fermi Gamma-Ray Pulsars to the local Flux of Cosmic-Ray Electrons and Positrons

Leo Gendelev, Stefano Profumo, Michael Dormody

摘要:

本文分析了第一个费米大面积望远镜(LAT)星表中的γ射线天体对宇宙线电子和正电子(e+e-)局域通量的贡献。我们提出了新的距离估计所有费米伽玛射线天体,测量的伽玛射线通量和脉冲形状的基础上。然后,我们估计的贡献,伽玛射线暴的本地e+e-通量,在一个简单的模型的背景下,脉冲星e+e-发射。我们发现,10个费米介子可能会显着贡献的测量e+e-通量在100 GeV和1 TeV之间的能量范围。在这10颗双星中,2颗是旧的EGRET伽马射线双星,2颗是用射电星历表发现的,6颗是用费米脉冲星盲查活动发现的。我们认为,已知的射电望远镜落在参数空间的e+e-的贡献,预计通常是远小于费米-LAT望远镜存在的那些地区。然而,比较费米伽马射线通量的敏感性的脉冲星参数空间的区域,其中一个显着的e+e-的贡献是预测,我们发现,一些已知的无线电还没有被费米探测到也可以显着地促进当地的e+e-通量,如果(i)他们是接近2千秒差距,如果(ii)他们有一个特征年龄的顺序为1兆年。

英文摘要:

We analyze the contribution of gamma-ray pulsars from the first Fermi-Large Area Telescope (LAT) catalogue to the local flux of cosmic-ray electrons and positrons (e+e-). We present new distance estimates for all Fermi gamma-ray pulsars, based on the measured gamma-ray flux and pulse shape. We then estimate the contribution of gamma-ray pulsars to the local e+e- flux, in the context of a simple model for the pulsar e+e- emission. We find that 10 of the Fermi pulsars potentially contribute significantly to the measured e+e- flux in the energy range between 100 GeV and 1 TeV. Of the 10 pulsars, 2 are old EGRET gamma-ray pulsars, 2 pulsars were discovered with radio ephemerides, and 6 were discovered with the Fermi pulsar blind-search campaign. We argue that known radio pulsars fall in regions of parameter space where the e+e- contribution is predicted to be typically much smaller than from those regions where Fermi-LAT pulsars exist. However, comparing the Fermi gamma-ray flux sensitivity to the regions of pulsar parameter space where a significant e+e- contribution is predicted, we find that a few known radio pulsars that have not yet been detected by Fermi can also significantly contribute to the local e+e- flux if (i) they are closer than 2 kpc, and if (ii) they have a characteristic age on the order of one mega-year.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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