从一般EBL密度的远距离源的VHE γ射线的光学深度
Optical depth for VHE gamma-rays from distant sources from a generic EBL density
摘要：
甚高能量（VHE;来自遥远源的伽马射线（E> 100 GeV）通过与来自紫外线（UV）到远红外线（FIR）（通常称为河外背景光; EBL）的扩散河外光子场的低能光子成对产生而衰减。在模拟VHE伽马射线源的本征谱时，正确地考虑衰减是至关重要的。不幸的是，EBL的直接测量是困难的，并且关于在某些波长范围内的EBL的知识是贫乏的。为了计算EBL衰减，通常使用来自理论模型的预测。最近，直接和间接方法对EBL的限制已经缩小了可能的EBL范围，并且许多先前的模型与这些限制相冲突。我们提出了一个新的通用EBL密度（不是一个完整的模型），这是符合新的EBL限制。计算中采用了一种非常简单但有效的自组织方法，将EBL随红移的演化计算在内。这个通用EBL的属性进行了讨论。
英文摘要：
Very-high-energy (VHE; E>100GeV) gamma-rays from distant sources suffer attenuation through pair-production with low energy photons from the diffuse extragalactic photon fields in the ultraviolet (UV) to far-infrared (FIR) (commonly referred to as Extragalactic Background Light; EBL). When modeling the intrinsic spectra of the VHE gamma-ray sources it is crucial to correctly account for the attenuation. Unfortunately, direct measurements of the EBL are difficult and the knowledge about the EBL over certain wavelength ranges is poor. To calculate the EBL attenuation usually predictions from theoretical models are used. Recently, the limits on the EBL from direct and indirect methods have narrowed down the possible EBL range and many of the previous models are in conflict with these limits. We propose a new generic EBL density (not a complete model), which is in compliance with the new EBL limits. EBL evolution with redshift is included in the calculation in a very simple but effective ad-hoc way. Properties of this generic EBL are discussed.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
