Relevance of photon-photon dispersion within the jet for blazar axionlike particle searches
Relevance of photon-photon dispersion within the jet for blazar axionlike particle searches
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DOI：
10.1103/physrevd.105.023017
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发表时间：
2021-12
影响因子：
5
通讯作者：
J. Davies;M. Meyer;G. Cotter
中科院分区：
文献类型：
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作者：
J. Davies;M. Meyer;G. Cotter
类轴粒子（ALP）可以在天体物理磁场的存在下与光子混合。在耀变体的伽马射线观测中寻找这种效应提供了迄今为止对ALP参数空间的一些最强约束。以前，光子-光子色散的伽马射线的CMB已被证明是重要的这些计算，并普遍包括在ALP光子混合模型。在这里，我们评估了其他光子场内的耀变体（由吸积盘，宽线区域，尘埃环，星光和同步加速器场产生）的色散的影响，通过建模的喷流和场的平谱射电类星体3C454.3和传播的ALP通过模型与和没有充分的色散计算。我们发现，全色散计算可以强烈影响混合，特别是在能量超过100 GeV -往往降低ALP光子转换概率。这可能对未来计划的搜索产生影响，例如，切伦科夫望远镜阵列，特别是那些寻找宇宙在最高能量下降低不透明度的望远镜。
Axionlike particles (ALPs) could mix with photons in the presence of astrophysical magnetic fields. Searching for this effect in gamma-ray observations of blazars has provided some of the strongest constraints on ALP parameter space so far. Previously, photon-photon dispersion of gamma-rays off of the CMB has been shown to be important for these calculations, and is universally included in ALP-photon mixing models. Here, we assess the effects of dispersion off of other photon fields within the blazar (produced by the accretion disk, the broad line region, the dust torus, starlight, and the synchrotron field) by modelling the jet and fields of the flat spectrum radio quasar 3C454.3 and propagating ALPs through the model both with and without the full dispersion calculation. We find that the full dispersion calculation can strongly affect the mixing, particularly at energies above 100 GeV – often reducing the ALP-photon conversion probability. This could have implications for future searches planned with, e.g., the Cherenkov Telescope Array, particularly those looking for a reduced opacity of the universe at the highest energies.