极大似然谱拟合及其在EBL约束下的应用
Maximum likelihood spectral fitting and its application to EBL constraints
摘要：
河外背景光（EBL）是宇宙背景光中强度第二高的光（第一高的是宇宙微波背景），它包含了从红外到紫外的红移光辐射，在所有的时代都有发射，这使得它在宇宙学上有很大的意义。虽然直接测量的EBL阻碍了前景污染，VHE排放从遥远的来源的观测可以用来获得间接测量的EBL。在这项工作中，一个最大似然拟合的能量谱的blazars观察VERITAS，一个阵列的地面成像大气切伦科夫望远镜敏感的甚高能量（VHE; E>100 GeV）的伽马射线。使用EBL形状和强度的理论模型，EBL归一化被视为自由参数，允许获得依赖于模型的约束。这种最大似然分析的细节和初步模型依赖的EBL的约束，提出。
英文摘要：
The extragalactic background light (EBL) is the second-most-intense form of cosmic background light (the first being the cosmic microwave background) and contains the redshifted optical radiation, from infra-red to ultraviolet, emitted across all epochs, making it of great cosmological interest. While direct measurements of the EBL are hampered by foreground contamination, observations of VHE emission from distant sources can be used to obtain indirect measurements of the EBL. In this work a maximum-likelihood fit is applied to the energy spectra of blazars observed by VERITAS, an array of ground-based imaging atmospheric Cherenkov telescopes sensitive to very-high-energy (VHE; E>100 GeV) gamma rays. Using theoretical models of the EBL shape and intensity, the EBL normalization is treated as a free parameter, allowing for model-dependent constraints to be obtained. Details of this maximum-likelihood analysis and preliminary model-dependent constraints on the EBL, are presented.
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