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Issue A&A
Volume 387, Number 2, May IV 2002
Page(s) 396 - 405
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20020303



A&A 387, 396-405 (2002)
DOI: 10.1051/0004-6361:20020303

Numerical simulations of the cosmic star formation history

Y. Ascasibar1, 2, G. Yepes1, S. Gottlöber2 and V. Müller2

1  Grupo de Astrofísica, C-XI Universidad Autónoma de Madrid, 28049 Madrid, Spain
2  Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482, Germany

(Received 12 November 2001 / Accepted 27 February 2002)

Abstract
The cosmic star formation history in Cold Dark Matter dominated cosmological scenarios is studied by means of hydrodynamical numerical simulations. In particular, we explore a low density model with a $\Lambda$-term and two high density models with different power spectra, all of them being spatially flat. Our simulations employ a fully nonlinear N-body and Eulerian hydrodynamics algorithm with a model for star formation and supernovae feedback that depends on two phenomenological parameters determined in agreement with previous papers. We find a nearly constant star formation rate beyond z=1, and we discuss which facts may determine the decrease in the SFR from z=1 to the present epoch. The $\Lambda$-term cosmology with realistic parameters for star formation and feedback best reproduces the observed star formation history.


Key words: galaxies: formation, stellar content -- cosmology: observations, theory -- stars: formation -- methods: N-body simulations

Offprint request: Y. Ascasibar, yago.ascasibar@uam.es

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