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Gas around galaxy haloes – II. Hydrogen absorption signatures from the environments of galaxies at redshifts 2

Tittley, Eric R.; Meiksin, Avery; Bolton, James S.; Tittley, Eric

Authors

Eric R. Tittley

Avery Meiksin

Eric Tittley



Abstract

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.

Journal Article Type Article
Publication Date Oct 11, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 453
Issue 1
Pages 899-913
APA6 Citation Tittley, E. R., Meiksin, A., Bolton, J. S., & Tittley, E. (2015). Gas around galaxy haloes – II. Hydrogen absorption signatures from the environments of galaxies at redshifts 2. Monthly Notices of the Royal Astronomical Society, 453(1), 899-913. https://doi.org/10.1093/mnras/stv1682
DOI https://doi.org/10.1093/mnras/stv1682
Keywords galaxies: formation, intergalactic medium, quasars: absorption lines, large-scale structure of Universe
Publisher URL https://academic.oup.com/mnras/article/453/1/899/1752401/Gas-around-galaxy-haloes-II-Hydrogen-absorption
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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