Published in "Planetary Systems in the Universe: Observation, Formation and Evolution", ASP Conference Series, Vol. 204, 2001, eds. Martin Harwit and Michael G. Hauser
Abstract. The cosmic far-infrared background is now well measured from 140 µm to 1 mm. Uncertainties remain at 100 µm (and even more at 60 µm). These are dominated by limitations of the zodiacal model. The nature of sources dominating the background near its maximum are beginning to be studied through deep surveys carried out with ISOPHOT. These surveys show very steep number counts and fluctuations of the background due to unresolved sources.
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