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• W2045546516 startingPage "1543" @default.
• W2045546516 abstract "We present new results on the frequency distribution of projected H i column densities f(NH i, X), total comoving covering fraction, and integrated mass densities ρH i of high-redshift, H i galactic gas from a survey of damped Lyα systems (DLAs) in the Sloan Digital Sky Survey, Data Release 5. For the full sample spanning z = 2.2–5 (738 DLAs), f(NH i, X) is well fitted by a double power law with a break column density Nd = 1021.55±0.04 cm-2 and low/high-end exponents α = −2.00 ± 0.05, − 6.4+1.1−1.6. The shape of f(NH i, X) is invariant during this redshift interval and also follows the projected surface density distribution of present-day H i disks as inferred from 21 cm observations. We conclude that H i gas has been distributed in a self-similar fashion for the past 12 Gyr. The normalization of f(NH i, X), in contrast, decreases by a factor of 2 during the ≈2 Gyr interval from z = 4–2.2 with coincident decreases in both the total covering fraction and ρH i. At z ≈ 2, these quantities match the present-day values suggesting no evolution during the past ≈10 Gyr. We argue that the evolution at early times is driven by violent processes that removes gas from nearly half the galaxies at z ≈ 3 establishing the antecedents of current early-type galaxies. The perceived constancy of ρH i, meanwhile, implies that H i gas is a necessary but insufficient precondition for star formation and that the global star formation rate is driven by the accretion and condensation of fresh gas from the intergalactic medium." @default.
• W2045546516 created "2016-06-24" @default.
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• W2045546516 date "2009-04-24" @default.
• W2045546516 modified "2023-10-14" @default.
• W2045546516 title "ON THE (NON)EVOLUTION OF H I GAS IN GALAXIES OVER COSMIC TIME" @default.
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• W2045546516 doi "https://doi.org/10.1088/0004-637x/696/2/1543" @default.
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