Issue |
A&A
Volume 445, Number 1, January I 2006
|
|
---|---|---|
Page(s) | 1 - 27 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20053116 | |
Published online | 13 December 2005 |
The history of the baryon budget
Cosmic logistics in a hierarchical universe
DAPNIA, Service d'Astrophysique, Bâtiment 709, L'Orme des Merisiers, 91191 Gif-sur-Yvette Cedex, France e-mail: romain.teyssier@cea.fr
Received:
22
March
2005
Accepted:
3
June
2005
Using a series of high-resolution N-body hydrodynamical numerical
simulations, we investigate several scenarios for the evolution of
the baryon budget in galactic halos. We derive individual halo
star formation history (SFH), as well as the global star formation
rate in the universe. We develop a simple analytical model that
allows us to compute surprisingly accurate predictions, when
compared to our simulations, but also to other simulations
presented in Springel & Hernquist (2003b, MNRAS, 339, 312). The model depends on two main
parameters: the star formation time scale and the wind
efficiency
. We also compute, for halos of a given
mass, the baryon fraction in each of the following phases: cold
disc gas, hot halo gas, and stars. Here again, our analytical
model predictions are in good agreement with simulation results,
if one correctly takes finite resolution effect into account. We
compare predictions of our analytical model to several
observational constraints and conclude that a very narrow range of
the model parameters is allowed. The important role played by
galactic winds is outlined, as well as a possible “superwind”
scenario in groups and clusters. The “anti-hierarchical” behavior
of observed SFH is reproduced well by our best model with
Gyr and
. We obtain in this case a
present-day cosmic baryon budget of
,
,
and
(diffuse background).
Key words: galaxies: formation / galaxies: stellar content / cosmology: theory / methods: analytical / methods: numerical / galaxies: evolution
© ESO, 2005
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