Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..211o&link_type=abstract
SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
This proceedings summarizes some of the findings of Ocvirk et al. 2008. The physics of diffuse gas accretion and the properties of the cold and hot modes of accretion onto proto-galaxies between z=2 and z=5.4 is investigated using the large cosmological simulation performed with the RAMSES code on the MareNostrum supercomputing facility. Galactic winds, chemical enrichment, UV background heating and radiative cooling are taken into account in this very high resolution simulation. Using accretion-weighted temperature histograms, we have measured the transition halo masses characterizing the existence of stabel hot shocks Msh and filamentary gas accretion Mst.
We find a hot shock transition mass of Msh=10^{11.6} Msun, with no significant evolution with redshift. Conversely, we find that Mst increases sharply with z. This is in striking agreement with the analytical predictions of Birnboim & Dekel 2003 and Dekel & Birnboim 2006, if we correct their metallicity assumptions to those we measure when computing radiative cooling rates.
We therefore find that metal enrichment of the intergalactic medium is a key ingredient in determining the transition mass from cold to hot dominated diffuse gas accretion.
Ocvirk Pierre
Pichon Christophe
Teyssier Romain
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