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+"Legend: gamma-ray background (CGB), cosmic X-ray background (CXB), cosmic ultraviolet/optical background (CUVOB), cosmic infrared background (CIB), cosmic microwave background (CMB), and cosmic radio background (CRB)" (caption) |
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[[Image:Extragalactic-background-power-density.jpg|thumb|321px|right|Schematic representation of the spectral energy distribution of the DEBRA. The dependent quantity is the [[spectral radiometric quantity|spectral]] [[spectral radiance|radiance]] multiplied by [[wavelength]], i.e. ''λL''<sub>e''λ''</sub>.
Legend: gamma-ray background (CGB), [[cosmic X-ray background]] (CXB), cosmic ultraviolet/optical background (CUVOB), [[cosmic infrared background]] (CIB), [[cosmic microwave background]] (CMB), and cosmic radio background (CRB)]]
The '''diffuse extragalactic background radiation''' (DEBRA) refers to the photon field of extragalactic origin that fills our Universe. It contains photons whose energies span more than twenty orders of magnitude, from 10<sup>−7</sup> eV to more than 100 GeV. This range covers everything from the [[Microwave|microwaves]] emitted by free hydrogen atoms to [[Ultra-high-energy gamma ray|ultra high-energy gamma rays]], which can only be emitted by the most powerful physical processes in the modern universe such as [[Kilonova|kilonovas]] and [[Binary black hole|merging black holes]].
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