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首页> 外文期刊>The Astrophysical Journal. Letters >Search for pulsed γ-ray emission from globular cluster M28
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Search for pulsed γ-ray emission from globular cluster M28

机译：搜索球状星团M28的脉冲γ射线发射

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摘要

Using the data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope, we have searched for γ-ray pulsations from the direction of the globular cluster M28 (NGC 6626). We report the discovery of a signal with a frequency consistent with that of the energetic millisecond pulsar (MSP) PSR B1821-24 in M28. A weighted H-test test statistic of 28.8 is attained, which corresponds to a chance probability of 10~(-5) (4.3σ detection). With a phase-resolved analysis, the pulsed component is found to contribute 25% of the total observed γ-ray emission from the cluster. However, the unpulsed level provides a constraint for the underlying MSP population and the fundamental plane relations for the scenario of inverse Compton scattering. Follow-up timing observations in radio/X-ray are encouraged to further investigate this periodic signal candidate.
机译：使用费米伽马射线太空望远镜上大面积望远镜的数据，我们从球状星团M28（NGC 6626）的方向搜索了γ射线脉动。我们报告发现信号的频率与M28中的高能脉冲星（MSP）PSR B1821-24一致。加权H检验的检验统计量为28.8，对应于10〜（-5）（4.3σ检测）的机会概率。通过相位解析分析，发现脉冲分量贡献了从团簇观测到的总γ射线发射的25％。但是，无脉冲能级为基础的MSP总体和逆康普顿散射情形的基本平面关系提供了约束。鼓励在无线电/ X射线中进行后续定时观察，以进一步研究该周期性信号候选者。

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