The Star-formation History of the Universe
Rowan-Robinson, M.
Original · EN
The star formation history derived from ultraviolet and Hα data, without correction for dust extinction, on the one hand, and from far infrared and submillimetre data, on the other, is investigated. The latter estimates are found to be a factor 2-3 higher than the former, consistent with 2/3-3/4 of the uv light in star forming regions being absorbed by dust and reemitted in the far infrared. A reanalysis of the Hubble Deep Field galaxies using photometric reshifts shows no evidence for a decline in star formation rate at z = 2-4. A simple and versatile parameterized approach to the star formation history allows a quantitative investigation of the constraints from far infrared and submillimetre counts and background intensity measurements. A good fit to the counts, the 850 μm background and the star formation history can be found in an Ωₒ = 1 universe, but this model fails to account for even the lowest estimates of the 140-350 μm background by a factor of 2. Either the observed values are overestimated or we need a new population of found in a Λ = 0, Ωₒ = 0.3 universe.
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