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arXiv 1603.03431astro-ph.HE
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切伦科夫望远镜阵列探测星系际磁场的灵敏度

Sensitivity of the Cherenkov Telescope Array to the Detection of Intergalactic Magnetic Fields

Manuel Meyer, Jan Conrad, Hugh Dickinson

摘要:

极高能(VHE;能量$E \gtrsim 100\,$ GeV)$γ$ --来自河外源的射线与背景辐射场的低能光子产生对。这些对可以逆康普顿散射背景光子,引发电磁级联。当$e^+e^-$对在星系际磁场中发生偏转时,这种次级$γ$射线信号的空间和时间结构会发生改变。我们研究如何VHE观测与未来的切伦科夫望远镜阵列,其高角分辨率和广泛的能量范围,可以潜在地探测IGMF。我们确定有前途的来源和模拟$γ$射线光谱在很宽的范围内的IGMF强度和相干长度的值使用公开可用的ELMAG蒙特卡罗代码。结合模拟观测的联合似然方法,我们发现,目前的限制IGMF可以显着改善。投射的灵敏度强烈地依赖于源已经是$γ$射线活性的时间和发射的最大$γ$射线能量。

英文摘要:

Very high energy (VHE; energy $E \gtrsim 100\,$GeV) $γ$-rays originating from extragalactic sources undergo pair production with low-energy photons of background radiation fields. These pairs can inverse-Compton-scatter background photons, initiating an electromagnetic cascade. The spatial and temporal structure of this secondary $γ$-ray signal is altered as the $e^+e^-$ pairs are deflected in an intergalactic magnetic field (IGMF). We investigate how VHE observations with the future Cherenkov Telescope Array with its high angular resolution and broad energy range, can potentially probe the IGMF. We identify promising sources and simulate $γ$-ray spectra over a wide range of values of the IGMF strength and coherence length using the publicly available ELMAG Monte Carlo code. Combining simulated observations in a joint likelihood approach, we find that current limits on the IGMF can be significantly improved. The projected sensitivity depends strongly on the time a source has been $γ$-ray active and on the emitted maximum $γ$-ray energy.

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