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

Understand

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.