Gas around galaxy haloes - II: hydrogen absorption signatures from the environments of galaxies at redshifts 2<z<3

Meiksin, Avery, Bolton, James S. and Tittley, Eric (2015) Gas around galaxy haloes - II: hydrogen absorption signatures from the environments of galaxies at redshifts 2<z<3. Monthly Notices of the Royal Astronomical Society, 453 (1). pp. 899-913. ISSN 1365-2966

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We compare predictions of large-scale cosmological hydrodynamical simulations for neutral hydrogen absorption signatures in the vicinity of 1011–1012.5 M⊙ haloes with observational measurements. Two different hydrodynamical techniques and a variety of prescriptions for gas removal in high-density regions are examined. Star formation and wind feedback play only secondary roles in the H i absorption signatures outside the virial radius, but play important roles within. Accordingly, we identify three distinct gaseous regions around a halo: the virialized region, the mesogalactic medium outside the virial radius arising from the extended haloes of galaxies out to about two turnaround radii and the intergalactic medium beyond. Predictions for the amount of absorption from the mesogalactic and intergalactic media are robust across different methodologies, and the predictions agree with the amount of absorption observed around star-forming galaxies and quasi-stellar object host galaxies. Recovering the measured amount of absorption within the virialized region, however, requires either a higher dynamic range in the simulations, additional physics, or both.

Item Type: Article
Additional Information: © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society
Keywords: galaxies: formation, intergalactic medium, quasars: absorption lines, large-scale structure of Universe
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
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Depositing User: Bolton, James
Date Deposited: 04 May 2017 13:54
Last Modified: 12 Oct 2017 22:41

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