The spatial distribution of cold gas in hierarchical galaxy formation models

Kim, H.-S.; Baugh, C.M.; Benson, A.J.; Cole, S.; Frenk, C.S.; Lacey, C.G.; Power, C.; Schneider, M.

doi:10.1111/j.1365-2966.2011.18556.x

The spatial distribution of cold gas in hierarchical galaxy formation models

Kim, H.-S.; Baugh, C.M.; Benson, A.J.; Cole, S.; Frenk, C.S.; Lacey, C.G.; Power, C.; Schneider, M.

Authors

H.-S. Kim

Professor Carlton Baugh c.m.baugh@durham.ac.uk
Professor

A.J. Benson

Professor Shaun Cole shaun.cole@durham.ac.uk
Director of the Institute for Computational Cosmology

Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor

Professor Cedric Lacey cedric.lacey@durham.ac.uk
Professor

C. Power

M. Schneider

Abstract

The distribution of cold gas in dark matter haloes is driven by key processes in galaxy formation: gas cooling, galaxy mergers, star formation and reheating of gas by supernovae. We compare the predictions of four different galaxy formation models for the spatial distribution of cold gas. We find that satellite galaxies make little contribution to the abundance or clustering strength of cold gas selected samples, and are far less important than they are in optically selected samples. The halo occupation distribution function of present-day central galaxies with cold gas mass >109 h−1 M⊙ is peaked around a halo mass of ≈1011 h−1 M⊙, a scale that is set by the AGN suppression of gas cooling. The model predictions for the projected correlation function are in good agreement with measurements from the H i Parkes All-Sky Survey. We compare the effective volume of possible surveys with the Square Kilometre Array with those expected for a redshift survey in the near-infrared. Future redshift surveys using neutral hydrogen emission will make possible measurements of the baryonic acoustic oscillations that are competitive with the most ambitious spectroscopic surveys planned in the near-infrared.

Citation

Kim, H., Baugh, C., Benson, A., Cole, S., Frenk, C., Lacey, C., …Schneider, M. (2011). The spatial distribution of cold gas in hierarchical galaxy formation models. Monthly Notices of the Royal Astronomical Society, 414(3), 2367-2385. https://doi.org/10.1111/j.1365-2966.2011.18556.x

Journal Article Type	Article
Publication Date	Jul 1, 2011
Deposit Date	Jan 27, 2012
Publicly Available Date	Dec 15, 2014
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	414
Issue	3
Pages	2367-2385
DOI	https://doi.org/10.1111/j.1365-2966.2011.18556.x
Keywords	Galaxies: evolution, Galaxies: formation, Galaxies: luminosity function, Mass function, Large-scale structure of Universe.
Related Public URLs	http://adsabs.harvard.edu/abs/2011MNRAS.414.2367K

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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.