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Adding short description: "Photon field that fills our universe" |
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{{Short description|Photon field that fills our universe}}
[[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>.]]▼
{{one source |date=March 2024}}
▲[[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 diffuse photon field from extragalactic origin that fills our Universe. It contains photons over ∼20 decades of energy from ~10<sup>−7</sup> eV to ~100 GeV. The origin and the physical processes involved are different within every wavelength range. There are plenty of observational evidences that support the existence of the DEBRA.<ref>{{cite journal▼
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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| author1 = Hauser M. G.
| author2 = Dwek E.
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* [[Cosmic radio background]]
== See also ==
* [[Photon underproduction crisis]]
==References==
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==External links==
* [http://ned.ipac.caltech.edu/level5/bcg_radiation.html Caltech papers]
{{Astronomy-stub}}▼
[[Category:Extragalactic astronomy]]
[[Category:Cosmic rays]]
[[Category:Cosmic background radiation]]
[[Category:Unsolved problems in astronomy]]
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