Abstract
Far-infrared maps obtained with ISOPHOT have been searched for point-like sources. The majority of the 55 sources is believed to be extragalactic and in most cases no previously known sources can be associated with them. Based on the far-infrared spectral energy distributions it is likely that dust-enshrouded, distant galaxies form a significant fraction of the sources.
We estimate the number densities of extragalactic sources at 90μm, 150μm and 180μm wavelengths and at flux density levels down to ∼100 mJy. The counts are compared with models of galaxy evolution. The counts exceed the predictions of current models, even those with strong evolution, and no-evolution models are rejected at a high confidence level.
Comparison with recent results from COBE mission indicates that at 90μm the detected sources correspond to ≳20% of the extragalactic background light. At longer wavelengths the corresponding fraction is 10%.
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Juvela, M., Mattila, K., Lemke, D. (2000). Cosmic Infrared Background: ISOPHOT FIR Source Counts at 90, 150 and 180 μm. In: Lemke, D., Stickel, M., Wilke, K. (eds) ISO Surveys of a Dusty Universe. Lecture Notes in Physics, vol 548. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45553-1_12
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DOI: https://doi.org/10.1007/3-540-45553-1_12
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