Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-27
Astronomy and Astrophysics
Astrophysics
4 pages, in "Panoramic Views of Galaxy Formation and Evolution" the 1st Subaru international conference, Hayama, Japan, Dec. 2
Scientific paper
Using a compilation of measurements of the stellar mass density as a function of redshift we can infer the cosmic star formation history. For z < 0.7 there is good agreement between the two star formation histories. At higher redshifts the instantaneous indicators suggest star formation rates larger than that implied by the evolution of the stellar mass density. This discrepancy peaks at z = 3 where instantaneous indicators suggest a star formation rate around 0.6 dex higher than those of the best fit to the stellar mass history. We discuss a variety of explanations for this inconsistency, such as inaccurate dust extinction corrections, incorrect measurements of stellar masses and a possible evolution of the stellar initial mass function.
Hopkins Andrew M.
Trentham Neil
Wilkins Stephen M.
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