Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222..202w&link_type=abstract
After the first three minutes. AIP Conference Proceedings, Volume 222, pp. 202-205 (1991).
Physics
Background Radiations, Ir Sources, Far Infrared
Scientific paper
We assess the general possibility of detecting the integrated background radiation from galaxies at far-infrared wavelengths. We model the evolution of interstellar dust in disk galaxies, and obtain analytical solutions for the dust abundance as a function of the galaxy age. The total emission from dust at far-infrared wavelengths in a galaxy is calculated. Consistent with IRAS observations, we find that the integrated far-infrared background from galaxies peaks at around 100-130 μm, with total radiation density 0.5 to 6% that of the cosmic microwave background. We calculate deviations due to galaxies at submillimeter wavelengths from the blackbody spectrum of the cosmic microwave background; in terms of the temperature variation, we find ΔTCMB/TCMB=(0.5-2)×10-2 at 0.4 mm. The autocorrelation of fluctuations in the far-infrared background due to the galaxy clustering is also calculated. The effects of the integrated radiation from galaxies are expected to be detected by COBE.
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