Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 410, Issue 4, Pages 2579-2592Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.17632.x
Keywords
methods: numerical; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: luminosity function, mass function; cosmology: theory
Categories
Funding
- NSF [AST-0807491]
- National Aeronautics and Space Administration [NNX08AE57A]
- UNLV
- NSF through Texas Advanced Computing Center
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We develop a new 'multicomponent and variable velocity' (MVV) galactic outflow model for cosmological smoothed particle hydrodynamic (SPH) simulations. The MVV wind model reflects the fact that the wind material can arise from different phases in the interstellar medium, and the mass-loading factor in the MVV model is a function of the galaxy stellar mass. We find that the simulation with the MVV outflow has the following characteristics: (i) the intergalactic medium (IGM) is hardly heated up, and the mean IGM temperature is almost the same as in the no-wind run; (ii) it has lower cosmic star formation rates (SFRs) compared to the no-wind run, but higher SFRs than the constant velocity wind run; (iii) it roughly agrees with the observed IGM metallicity, and roughly follows the observed evolution of Omega(C IV); and (iv) the lower mass galaxies have larger mass-loading factors, and the low-mass end of galaxy stellar mass function is flatter than in the previous simulations. Therefore, the MVV outflow model mildly alleviates the problem of too steep galaxy stellar mass function seen in the previous SPH simulations. In summary, the new MVV outflow model shows reasonable agreement with observations and gives better results than the constant-velocity wind model.
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