来自CIBER的近红外河外背景光一个未知成分的新光谱证据
New Spectral Evidence of an Unaccounted Component of the Near-infrared Extragalactic Background Light from the CIBER
摘要：
银河系外背景光（EBL）捕获了整个宇宙历史中来自恒星和星系的总积分发射。空间绝对测光观测的近红外EBL振幅一直存在争议，并且强烈依赖于黄道光前景的建模和相减。我们报告的第一次测量的漫反射背景光谱在0.8-1.7微米的CIBER实验。这些观测是用绝对光谱仪在多个天区的两次飞行中获得的，以便能够减去黄道光、恒星、地球辐射和漫射的银河光。在减去前景并考虑系统误差后，我们发现标称EBL亮度，假设Kelsall黄道光模型，在1.4 μ m处为42.7+11.9/-10.6 nW/m2/sr。我们还使用Wright黄道光模型分析了数据，这导致数据的统计拟合较差，EBL不符合物理学，低于已知的星系背景光<1.3 μ m。使用基于最小EBL亮度的模型独立分析，我们发现在1.4 μ m处的EBL亮度为28.7+5.1/-3.3 nW/m2/sr。虽然推导出的EBL振幅强烈依赖于黄道光模型，我们发现，我们不能适合的光谱数据黄道光，银河系的排放，和EBL从单独集成的星系光从星系计数。结果需要一个新的漫射组件，例如额外的前景或具有比黄道光更红的光谱的过量EBL。
英文摘要：
The Extragalactic Background Light (EBL) captures the total integrated emission from stars and galaxies throughout the cosmic history. The amplitude of the near-infrared EBL from space absolute photometry observations has been controversial and depends strongly on the modeling and subtraction of the Zodiacal light foreground. We report the first measurement of the diffuse background spectrum at 0.8-1.7 um from the CIBER experiment. The observations were obtained with an absolute spectrometer over two flights in multiple sky fields to enable the subtraction of Zodiacal light, stars, terrestrial emission, and diffuse Galactic light. After subtracting foregrounds and accounting for systematic errors, we find the nominal EBL brightness, assuming the Kelsall Zodiacal light model, is 42.7+11.9/-10.6 nW/m2/sr at 1.4 um. We also analyzed the data using the Wright Zodiacal light model, which results in a worse statistical fit to the data and an unphysical EBL, falling below the known background light from galaxies at <1.3 um. Using a model-independent analysis based on the minimum EBL brightness, we find an EBL brightness of 28.7+5.1/-3.3 nW/m2/sr at 1.4 um. While the derived EBL amplitude strongly depends on the Zodiacal light model, we find that we cannot fit the spectral data to Zodiacal light, Galactic emission, and EBL from solely integrated galactic light from galaxy counts. The results require a new diffuse component, such as an additional foreground or an excess EBL with a redder spectrum than that of Zodiacal light.
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