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- W1574759502 abstract "We investigate some basic properties of Damped Lyman alpha systems based on the Semi-Analytical model of disk galaxy formation theory. We derive the DLA metallicity, column density, number density, gas content and cosmic star formation rate by assuming that disks form at the center of dark halos, and the modelled DLAs are selected by Monte Carlo simulation according to the distributions of halo properties. We find that DLA hosts are dominated by small galaxies and biased to extended galaxies. In terms of model results, DLAs could naturally arise in a ACDM universe from radiatively cooled gas in dark matter halos. However, model predicts a reverse correlation between metallicity and the column density when compared with observations, regardless of the proposed observational bias. We argue that this could be resulted from the model limitations, or the inadequacy of Schmidt-type star formation mode at high redshift, or/and the diversities of DLA populations." @default.
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- W1574759502 date "2004-01-01" @default.
- W1574759502 modified "2023-10-18" @default.
- W1574759502 title "Physical Properties of Dlas: Metallicity and Neutral Hydrogen Column Density" @default.
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- W1574759502 doi "https://doi.org/10.1017/s0074180900197657" @default.
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