A DETERMINATION OF THE INTERGALACTIC REDSHIFT-DEPENDENT ULTRAVIOLET–OPTICAL–NIR PHOTON DENSITY USING DEEP GALAXY SURVEY DATA AND THE GAMMA-RAY OPACITY OF THE UNIVERSE
A DETERMINATION OF THE INTERGALACTIC REDSHIFT-DEPENDENT ULTRAVIOLET–OPTICAL–NIR PHOTON DENSITY USING DEEP GALAXY SURVEY DATA AND THE GAMMA-RAY OPACITY OF THE UNIVERSE
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DOI：
10.1088/0004-637x/761/2/128
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
F. Stecker;M. Malkan;S. Scully
中科院分区：
文献类型：
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作者：
F. Stecker;M. Malkan;S. Scully
我们使用基于从本地星系到深层星系调查的许多不同波长带中获得的观测数据的方法，计算作为红移函数的星系间背景光（IBL）的强度和光子光谱。这使我们能够获得 IBL 的经验确定并量化其基于观测的不确定性。然后，利用我们在 IBL 上的结果，我们对宇宙对 γ 射线的不透明度设定了 68% 的置信度上限和下限，而无需过去计算所需的理论假设。我们将我们的结果与费米伽马射线太空望远镜观测获得的河外背景光和上限的测量结果进行比较。
We calculate the intensity and photon spectrum of the intergalactic background light (IBL) as a function of redshift using an approach based on observational data obtained in many different wavelength bands from local to deep galaxy surveys. This allows us to obtain an empirical determination of the IBL and to quantify its observationally based uncertainties. Using our results on the IBL, we then place 68% confidence upper and lower limits on the opacity of the universe to γ-rays, free of the theoretical assumptions that were needed for past calculations. We compare our results with measurements of the extragalactic background light and upper limits obtained from observations made by the Fermi Gamma-ray Space Telescope.