TL;DR
This paper uses cosmological hydrodynamic simulations to study the properties of Damped Lyman-alpha systems and their connection to galaxy formation, providing predictions for future observations and analyzing feedback effects.
Contribution
It offers a comprehensive simulation-based analysis of DLAs, linking their properties to galaxy formation and predicting observables for upcoming telescopes.
Findings
Simulations reproduce key DLA statistics with some deviations.
Feedback from supernovae and winds impacts DLA distribution.
Predictions made for [C_II] emission detectable by ALMA and SPICA.
Abstract
Damped Lyman-alpha systems (DLAs) are useful probes of star formation and galaxy formation at high redshift. We study the physical properties of DLAs and their relationship to Lyman-break galaxies using cosmological hydrodynamic simulations based on the concordance Lambda cold dark matter model. Fundamental statistics such as global neutral hydrogen (HI) mass density, HI column density distribution function, DLA rate-of-incidence and mean halo mass of DLAs are reproduced reasonably well by the simulations, but with some deviations that need to be understood better in the future. We discuss the feedback effects by supernovae and galactic winds on the DLA distribution. We also compute the [C_II] emission from neutral gas in high-z galaxies, and make predictions for the future observations by ALMA and SPICA. Agreement and disagreement between simulations and observations are discussed, as…
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