论文标题
在费米和CTA时代的多波伦长HST/Candels调查中对不断发展的外乳外背景光的观察确定
An observational determination of the evolving extragalactic background light from the multiwavelength HST/CANDELS survey in the Fermi and CTA era
论文作者
论文摘要
弥漫性外抗背景光（EBL）由紫外线（UV），光学和红外（IR）光子形成，主要由恒星形成过程在宇宙历史上产生，并包含有关星系进化和宇宙学的基本信息。在这里，我们使用一种纯粹基于星系数据的新方法来介绍对EBL光谱分布的新确定，旨在减少对较高红移和IR强度的当前不确定性。我们的计算使用了从紫外线到150,000个星系的样本的多波长观测值，该样品在宇宙组装近红外深处的深层深度外静态遗产调查（糖果）中检测到的大约150,000个星系的样本，从哈勃太空望远镜中检测到了$ z \ sim 6 $。这是有史以来获得的最全面，最深层的多波长星系数据集之一。这些前所未有的资源使我们能够得出总的EBL进化，最高为$ z \ sim 6 $及其不确定性。我们的结果与从星系调查和$γ$射线衰减（如单色光度密度（包括Far-Ir）和恒星形成速率密度（包括最高红色）的单色光度密度（包括单色光度密度）（包括单色光度密度）估计的宇宙可观察物相一致。我们的EBL近似中的光学深度将在高红移时稳健，对于$γ$射线，将在同伴论文中报道。
The diffuse extragalactic background light (EBL) is formed by ultraviolet (UV), optical, and infrared (IR) photons mainly produced by star formation processes over the history of the Universe, and contains essential information about galaxy evolution and cosmology. Here, we present a new determination of the evolving EBL spectral energy distribution using a novel approach purely based on galaxy data aiming to reduce current uncertainties on the higher redshifts and IR intensities. Our calculations use multiwavelength observations from the UV to the far-IR of a sample of approximately 150,000 galaxies detected up to $z\sim 6$ in the five fields of the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CANDELS) from the Hubble Space Telescope. This is one of the most comprehensive and deepest multi-wavelength galaxy datasets ever obtained. These unprecedented resources allow us to derive the overall EBL evolution up to $z\sim 6$ and its uncertainties. Our results agree with cosmic observables estimated from galaxy surveys and $γ$-ray attenuation such as monochromatic luminosity densities, including those in the far-IR, and star formation rate densities, also at the highest redshits. Optical depths from our EBL approximation, which will be robust at high redshifts and for $γ$ rays up to tens of TeV, will be reported in a companion paper.
