标题： 局部前景辐射对河外源极高能观测的影响 显示英文标题

标题： Impact of local foreground radiations on Very High Energy observations of extragalactic sources

摘要： 在利用河外源的极高能（VHE）伽马射线观测来推断宇宙背景辐射强度以及对粒子和物理相互作用的标准模型偏差（如洛伦兹不变性破坏和类轴子粒子——LIV和ALPs）的约束框架下，我们在此讨论由于本地源辐射场存在而可能产生的污染效应。 我们具体建模并分析了来自VHE源宿主星系内部以及源本身所处的宇宙环境产生的前景辐射，以及沿着VHE源观测视线方向在银河系内产生的辐射。 我们的分析表明，这种污染前景确实可能影响仅限于非常局部的活动星系核（例如半人马座A）的观测，但对室女座星系团（M87）及更远的观测影响不大。 显示英文摘要

摘要： In the framework of exploiting Very High Energy (VHE) gamma-ray observations of extragalactic sources to infer constraints on the intensity of cosmological background radiations, as well as on deviations from the standard model of particles and physical interactions (like violations of Lorentz invariance and axion-like particles -- LIV and ALPs), we discuss here possible contaminant effects due to the presence of radiations fields from local sources. We specifically model and analyze the foreground radiations produced inside the host galaxy of the VHE source and the cosmic environment itself hosting the source, as well as radiations produced in the Milky Way, along the VHE source's observational line-of-sights. Our analysis shows that such contaminant foregrounds may indeed impact on observations of only the very local Active Galactic Nuclei (e.g. Centaurus A), but not significantly those in the Virgo cluster (M87) and beyond.