What is EBL?

• Extragalactic background light (EBL): 0.1-1000 mm

• Cosmic Infrared Background (CIB) : 1-1000 mm

• Source contribution:

  • Nuclear (stellar radiation)
  • Gravitational (AGN, brown dwarfs, ...)
  • Exotic (decay of primordial particles)

• Difficulties:

  • No unique spectral characteristics
  • Strong foreground emission
  • Interstellar dust emission