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arXiv 2004.13596astro-ph.HE
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宇宙无线电背景的更新估计和对超高能光子传播的影响

An updated estimate of the cosmic radio background and implications for ultra-high-energy photon propagation

I. C. Niţu, H. T. J. Bevins, J. D. Bray, A. M. M. Scaife

摘要:

我们提出了一个更新的估计宇宙射电背景(CRB)和相应的衰减长度的超高能光子。这一新的估计提供了相关的不确定性,作为从关键物理参数的观测约束得出的频率的函数。我们还提出了预期的CRB光谱的变化作为这些参数的函数,以及占人口的射电星系之间的光谱指数的预期变化。在这项工作中提出的新的估计显示出更好的协议与观测约束的无线电源计数测量比以前的计算。在我们预计宇宙起源光子主要由CRB衰减的能量范围内,我们对衰减长度的计算与以前的估计相差高达3倍,这取决于能量和用于比较的特定模型。这些结果意味着宇宙起源光子的预期数量减少,能量为$\sim 10^{19}-10^{20}$ eV。

英文摘要:

We present an updated estimate of the cosmic radio background (CRB) and the corresponding attenuation lengths for ultra-high energy photons. This new estimate provides associated uncertainties as a function of frequency derived from observational constraints on key physical parameters. We also present the expected variation in the spectrum of the CRB as a function of these parameters, as well as accounting for the expected variation in spectral index among the population of radio galaxies. The new estimate presented in this work shows better agreement with observational constraints from radio source-count measurements than previous calculations. In the energy regime where we expect cosmogenic photons dominantly attenuated by the CRB, our calculation of the attenuation length differs from previous estimates by a factor of up to 3, depending on energy and the specific model for comparison. These results imply a decrease in the expected number of cosmogenic photons with energies $\sim 10^{19}-10^{20}$ eV.

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