Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-04
Astrophys.J.634:155-160,2005
Astronomy and Astrophysics
Astrophysics
16 pages, 8 figures, accepted for publication in the ApJ on July 15, 2005
Scientific paper
10.1086/462400
The 1 - 5 micron diffuse sky emission from which local foreground emission from the solar system and the Galaxy have been subtracted exceeds the brightness that can be attributed to normal star forming galaxies. The nature of this excess near-infrared background light (NIRBL) is still controversial. On one hand, it has been interpreted as a distinct spectral feature created by the redshifted emission from primordial (Population III) stars that have formed at redshifts > 8. On the other hand, the NIRBL spectrum is almost identical to that of the zodiacal cloud, raising the possibility that it is of local origin. Blazars can, in principle, offer a simple test for the nature and origin of the NIRBL. Very high energy gamma-ray photons emitted by these objects are attenuated on route to earth by photon-photon interactions with the extragalactic background light (EBL). This paper examines whether the extragalactic nature of the NIRBL can be determined from the analysis of the TeV spectra of blazars. (Abridged)
Arendt Richard G.
Dwek Eli
Krennrich Frank
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