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The Extragalactic Background Light (EBL) captures the total integratedemission from stars and galaxies throughout the cosmic history. The amplitudeof the near-infrared EBL from space absolute photometry observations has beencontroversial and depends strongly on the modeling and subtraction of theZodiacal light foreground. We report the first measurement of the diffusebackground spectrum at 0.8-1.7 um from the CIBER experiment. The observationswere obtained with an absolute spectrometer over two flights in multiple skyfields to enable the subtraction of Zodiacal light, stars, terrestrialemission, and diffuse Galactic light. After subtracting foregrounds andaccounting for systematic errors, we find the nominal EBL brightness, assumingthe Kelsall Zodiacal light model, is 42.7+11.9/-10.6 nW/m2/sr at 1.4 um. Wealso analyzed the data using the Wright Zodiacal light model, which results ina worse statistical fit to the data and an unphysical EBL, falling below theknown background light from galaxies at <1.3 um. Using a model-independentanalysis based on the minimum EBL brightness, we find an EBL brightness of28.7+5.1/-3.3 nW/m2/sr at 1.4 um. While the derived EBL amplitude stronglydepends on the Zodiacal light model, we find that we cannot fit the spectraldata to Zodiacal light, Galactic emission, and EBL from solely integratedgalactic light from galaxy counts. The results require a new diffuse component,such as an additional foreground or an excess EBL with a redder spectrum thanthat of Zodiacal light.

New Spectral Evidence of an Unaccounted Component of the Near-infrared Extragalactic Background Light from the CIBER