Gamma-ray天空中弓形结对星系际磁场的约束
Constraints on the Intergalactic Magnetic Field from Bow Ties in the Gamma-ray Sky
摘要：
对宇宙红外背景和随后的反康普顿散射的CMB可能重新处理的TeV的耀变体的排放到微弱的GeV晕结构敏感的星系际磁场（IGMF）。以前的工作表明，这些晕是高度各向异性和扩展。如果IGMF的相干长度大于对的逆康普顿冷却长度，则伽马射线晕的取向将与磁场的方向相关，该方向是未知的并且预期针对每个源而改变。为了建设性地添加每个源，我们然后使用角功率谱是不敏感的射流方向。通过观察费米探测到的已知GeV耀变体，我们排除了相干长度$>100$ Mpc大于$3.9σ$、当前强度在$10^{-16}$到$10^{-15}$ G范围内、相干长度为2 $σ$从$10^{-17}$到$10^{-14}$ G的IGMF的存在。这提供了一个直接的测量不存在的伽马射线晕，提供了一个重要的检查以前的结果。
英文摘要：
Pair creation on the cosmic infrared background and subsequent inverse-Compton scattering on the CMB potentially reprocesses the TeV emission of blazars into faint GeV halos with structures sensitive to intergalactic magnetic fields (IGMF). Previous work has shown that these halos are then highly-anisotropic and extended. If the coherence length of the IGMF is greater than the inverse-Compton cooling length of the pairs, then the orientation of the gamma-ray halo will be correlated with the direction of the magnetic field which is unknown and expected to change for each source. In order to constructively add each source we then use angular power spectra which are insensitive to the jet orientation. By looking at known GeV blazars detected by Fermi, we exclude the existence of an IGMF with coherence lengths $>100$ Mpc at greater than $3.9σ$ with current-day strengths in the range $10^{-16}$ to $10^{-15}$ G, and at 2$σ$ from $10^{-17}$ to $10^{-14}$ G. This provides a direct measurement of the non-existence of gamma-ray halos, providing an important check on previous results.
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