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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742787.0, MPI für Astronomie / Publikationen_mpia
The neutral hydrogen cosmological mass density at z = 5
Authors:Crighton, N. H. M.; Murphy, M. T.; Prochaska, J. X.; Worseck, G.; Rafelski, M.; Becker, G. D.; Ellison, S. L.; Fumagalli, M.; Lopez, S.; Meiksin, A.; O’Meara, J. M.; Knapen, J. H.; Lee, J. C.
Place of Publication:Cambridge
Publisher:Cambridge Univ. Press
Date of Publication (YYYY-MM-DD):2017
Audience:Not Specified
Abstract / Description:We present the largest homogeneous survey of redshift > 4.4 damped Lyα systems (DLAs) using the spectra of 163 quasars that comprise the Giant Gemini GMOS (GGG) survey. With this survey we make the most precise high-redshift measurement of the cosmological mass density of neutral hydrogen, ΩHI. After correcting for systematic effects using a combination of mock and higher-resolution spectra, we find ΩHI= 0.98+0.20 -0.18 × 10-3 at <z> = 4.9, assuming a 20% contribution from lower column density systems below the DLA threshold. By comparing to literature measurements at lower redshifts, we show that ΩHI can be described by the functional form ΩHI(z) ~ (1 + z)0.4. This gradual decrease from z = 5 to 0 suggests that in the galaxies which dominate the cosmic star formation rate, Hi is a transitory gas phase fuelling star formation which must be continually replenished by more highly-ionized gas from the intergalactic medium, and from recycled galactic winds.
External Publication Status:published
Document Type:Other
Communicated by:N. N.
Affiliations:MPI für Astronomie
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