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- W2023558570 abstract "We present the results of a numerical study of a galactic model and its implications on the properties of damped Lyα absorbers (DLAs) using cosmological hydrodynamic simulations. We vary both the strength and the internal parameters of the model in a series of smoothed particle hydrodynamics (SPH) simulations that include radiative cooling and heating by a UV background, star formation, and feedback from supernovae and galactic winds. To test our simulations, we examine the DLA of as a function of halo mass, galaxy apparent magnitude, and impact parameter. We find that the statistical distribution of DLAs does not depend on the exact values of internal numerical parameters that control the decoupling of hydrodynamic forces when the gas is ejected from star-forming regions, although the exact spatial distribution of neutral gas may vary for individual halos. The DLA rate of incidence in our simulations at z = 3 is dominated (80%-90%) by the faint galaxies with apparent magnitude AB < 25.5. However, interestingly in a strong wind run, the differential distribution of DLA sight lines is peaked at Mhalo = 1012 h-1 M☉ (AB 27), and the mean DLA halo mass is MDLA = 1012.4 h-1 M☉ (AB 26). The DLAs in our simulations are more compact than the present-day disk galaxies, and the impact parameter distribution is very narrow unless we limit the search for the host galaxy to only bright Lyman break galaxies (LBGs). We discuss conflicts between current simulations and observations, and potential problems with hydrodynamic simulations based on the cold dark matter model." @default.
- W2023558570 created "2016-06-24" @default.
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- W2023558570 date "2007-05-10" @default.
- W2023558570 modified "2023-10-14" @default.
- W2023558570 title "Distribution of Damped Lyα Absorbers in a Λ Cold Dark Matter Universe" @default.
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- W2023558570 doi "https://doi.org/10.1086/513001" @default.
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