Observations of Infrared Extragalactic Background Light

Astronomy and Astrophysics – Astronomy

Scientific paper

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Infrared Radiation, Extragalactic Background Light, Cosmology

Scientific paper

Based on the recent space missions, the observations of infrared extragalactic background light (IREBL) are reviewed. In the near infrared region, IRTS/NIRS data show bright extragalactic background with a stellar like spectrum which is significantly brighter than the integrated light of galaxies. The star subtraction analyses from DIRBE data show the essentially same results besides the uncertainty in the model of zodiacal light. IRTS/NIRS data also show fluctuations of the sky with 100 ~ 200 arcmin. angular scale that could originate in the large scale structure at high redshift. In the far-infrared and submillimeter regions COBE/DIRBE data indicate significant EBL. The obtained submillimeter background can be resolved into point sources by the SCUBA deep survey, while the far-infrared background requires considerable evolution effect as confirmed by ISO deep surveys. The total energy flux of IREBL amounts to 50 ~ 80 nWm-2sr-1 which is so bright that unknown energy sources at high redshifts are required.

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