Parity-odd correlators of diffuse gamma-rays and intergalactic magnetic fields

Parity-odd correlators of diffuse gamma-rays and intergalactic magnetic fields
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DOI:
10.1093/mnras/stu2736
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发表时间:
2014-09
影响因子:
4.8
通讯作者:
H. Tashiro;T. Vachaspati
H. Tashiro;T. Vachaspati
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
H. Tashiro;T. Vachaspati

文献摘要

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我们研究了星系间螺旋磁场与弥漫伽马射线天空中宇称奇数特征之间的联系。我们发现宇称奇相关器 $Q(R)$ 中峰值的位置和幅度可用于推断星系间磁场的法向功率谱和螺旋功率谱。当应用于 Fermi-LAT 数据时,$Q(R)$ 中观测到的峰值幅度给出 $\sim 10^{-14}~{\rm G}$ 星系间磁场强度,这与早期仅使用峰值位置的独立估计一致(Tashiro 等人,2014)。我们讨论了观测到的 $Q(R)$ 中的特征,这些特征进一步支持星系际磁场假说并为未来的测试做出预测。
We develop the connection between intergalactic helical magnetic fields and parity odd signatures in the diffuse gamma ray sky. We find that the location and the amplitude of a peak in a parity odd correlator, $Q(R)$, can be used to infer the normal and helical power spectra of the intergalactic magnetic field. When applied to Fermi-LAT data, the amplitude of the observed peak in $Q(R)$ gives $\sim 10^{-14}~{\rm G}$ intergalactic magnetic field strength, which is consistent with an earlier independent estimate that only used the peak location (Tashiro et al. 2014). We discuss features in the observed $Q(R)$ that further support the intergalactic magnetic field hypothesis and make predictions for future tests.