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extragalactic background light

(EBL)
(electromagnetic radiation from star formation and AGNs)

The term extragalactic background light (EBL) typically refers to cosmic background radiation over a range of wavelengths including visible light (the cosmic optical background) and more on each end: typically 0.1 and 1000μm, spanning a range from the cosmic microwave background into ultraviolet. Generally the term is intended to exclude the CMB, i.e., to mean "all that other electromagnetic radiation (EMR) around the universe".

EBL is challenging to measure because of galactic sources of flux.


(EMR,background,CBR)
http://en.wikipedia.org/wiki/Extragalactic_background_light
WaveLFreqPhoton
Energy
  
0.1um3.0PHz12eVbeginextragalactic background light
1000um300GHz1.3meVendextragalactic background light

Referenced by:
cosmic background radiation (CBR)

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