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- W1994152016 abstract "Damped absorbers, seen in the spectra of background quasars, are unique probes to select H i-rich galaxies. These galaxies allow one to estimate the neutral gas mass over cosmological scales. The neutral gas mass is a possible indicator of gas consumption as star formation proceeds. The damped Lyα absorbers (DLAs; N H I ≥ 2 × 1020 cm-2 ) and sub-DLAs (1019 ≤ N H I ≤ 2 × 1020 cm-2 ) are believed to contain a large fraction of neutral gas mass in the Universe. In Paper I of the series, we presented the results of a search for DLAs and sub-DLAs in the European Southern Observatory (ESO) Ultraviolet Visual Echelle Spectrograph (UVES) advanced data products dataset of 250 quasars. Here we use an unbiased subsample of sub-DLAs from this dataset to derive their statistical properties. We built a subset of 122 quasars ranging from 1.5 em = 193. We derived the redshift evolution of the number density and the line density for sub-DLAs and compared them with the Lyman-limit systems (LLSs) and DLA measurements from the literature. The results indicate that these three classes of absorbers are evolving in the redshift interval 1.0 H I (N,z ), down to the sub-DLA limit. The flattening of f H I (N,z ) in the sub-DLA regime is present in the observations. The redshift evolution of f H I (N,z ) down to log N H I = 19.0 cm-2 is also presented, indicating that there are more sub-DLAs at high redshift than at low redshift. f H I (N,z ) was also used to determine the neutral gas mass density, Ωg , at 1.5 from 1.5 was observed from low to high redshift (i.e., 1.5 < 5.0), suggesting that star formation alone cannot explain this non-evolution and replenishment of gas and that recombination of ionized gas is needed." @default.
- W1994152016 created "2016-06-24" @default.
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- W1994152016 date "2013-08-01" @default.
- W1994152016 modified "2023-10-17" @default.
- W1994152016 title "The ESO UVES advanced data products quasar sample: II. Cosmological evolution of the neutral gas mass density" @default.
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