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.

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.
• Public URL: https://durham-repository.worktribe.com/output/1512603
• Related Public URLs: http://adsabs.harvard.edu/abs/2011MNRAS.414.2367K