Intergalactic magnetic field spectra from diffuse gamma-rays
Intergalactic magnetic field spectra from diffuse gamma-rays
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DOI：
10.1093/mnras/stv308
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发表时间：
2014-12
影响因子：
4.8
通讯作者：
Wenlei Chen;Borun D. Chowdhury;F. Ferrer;H. Tashiro;T. Vachaspati
中科院分区：
文献类型：
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作者：
Wenlei Chen;Borun D. Chowdhury;F. Ferrer;H. Tashiro;T. Vachaspati
费米-LAT观测到的伽马射线到达方向的非零宇称奇子表明存在螺旋星系际磁场（Tashiro等人，2013）。我们成功地测试了这一假设，使用更严格的数据切割，使用费米-LAT时间曝光信息的Monte Carlo模拟，对北方和南方银河半球的单独分析，并证实了Tashiro & Vachaspati（2014）的预测。在一些进一步的技术假设下，我们给出了如何从宇称奇子中重建磁螺旋度谱。
Non-vanishing parity-odd correlators of gamma ray arrival directions observed by Fermi-LAT indicate the existence of a helical intergalactic magnetic field (Tashiro et al.2013). We successfully test this hypothesis using more stringent cuts of the data, Monte Carlo simulations with Fermi-LAT time exposure information, separate analyses for the northern and southern galactic hemispheres, and confirm predictions made in Tashiro & Vachaspati (2014). With some further technical assumptions, we show how to reconstruct the magnetic helicity spectrum from the parity-odd correlators.