用NIR深星系巡天数据和宇宙的Gamma-ray不透明度对星系际背景光的经验测定
An Empirical Determination of the Intergalactic Background Light Using NIR Deep Galaxy Survey Data out to 5 microns and the Gamma-ray Opacity of the Universe
摘要：
我们扩展我们以前的模型独立的测定星系际背景光（IBL），纯粹基于星系调查数据，出5微米的波长。我们的方法使我们能够限制光子密度的范围，基于观测确定的光度密度和颜色的不确定性。我们进一步确定了一个68%的置信上限和下限的不透明度的宇宙伽马射线的能量为1.6/（1+z）TeV。我们的下限红移相关的不透明度曲线的不透明度限制来自地面的空气切伦科夫望远镜和费米-LAT观测PKS 1424+240的结果的比较，使我们能够放置一个新的上限，这个源的红移，独立于IBL建模。
英文摘要：
We extend our previous model-independent determination of the intergalactic background light (IBL), based purely on galaxy survey data, out to a wavelength of 5 microns. Our approach enables us to constrain the range of photon densities, based on the uncertainties from observationally determined luminosity densities and colors. We further determine a 68% confidence upper and lower limit on the opacity of the universe to gamma-rays up to energies of 1.6/(1+z) TeV. A comparison of our lower limit redshift-dependent opacity curves to the opacity limits derived from the results of both ground-based air Cherenkov telescope and Fermi-LAT observations of PKS 1424+240 allows us to place a new upper limit on the redshift of this source, independent of IBL modeling.
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