寻找原始螺旋磁场
Searching for primordial helical magnetic fields
摘要:
星系际磁场(IGMF)中非零螺旋度的存在被认为是其原始起源的一个明确标志。我们扩展了以前的分析扩散费米-LAT伽马射线数据从2.5年到11年以上,并表明螺旋磁场在2.5年的数据提示是一个统计波动。然后,我们研究了使用单个源的螺旋磁场的检测前景,例如,TeV伽马射线耀变体。我们发现,检测是具有挑战性的采用现实的模型级联演变,IGMF和检测器的分辨率在我们的模拟。
英文摘要:
The presence of non-zero helicity in intergalactic magnetic fields (IGMF) has been suggested as a clear signature for their primordial origin. We extend a previous analysis of diffuse Fermi-LAT gamma-ray data from 2.5 to more than 11 years and show that a hint for helical magnetic fields in the 2.5 year data was a statistical fluctuation. Then we examine the detection prospects of helical magnetic fields using individual sources as, e.g., TeV gamma-ray blazars. We find that a detection is challenging employing realistic models for the cascade evolution, the IGMF and the detector resolution in our simulations.
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