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Galaxy formation in the Planck Millennium : the atomic hydrogen content of dark matter haloes.

Baugh, C. M. and Gonzalez-Perez, Violeta and Lagos, Claudia D. P. and Lacey, Cedric G. and Helly, John C. and Jenkins, Adrian and Frenk, Carlos S. and Benson, Andrew J. and Bower, Richard G. and Cole, Shaun (2019) 'Galaxy formation in the Planck Millennium : the atomic hydrogen content of dark matter haloes.', Monthly notices of the Royal Astronomical Society., 483 (4). pp. 4922-4937.

Abstract

We present recalibrations of the GALFORM semi-analytical model of galaxy formation in a new N-body simulation with the Planck cosmology. The Planck Millennium simulation uses more than 128 billion particles to resolve the matter distribution in a cube of 800 Mpc on a side, which contains more than 77 million dark matter haloes with mass greater than 2.12 × 109 h−1 M⊙ at this day. Only minor changes to a very small number of model parameters are required in the recalibration. We present predictions for the atomic hydrogen content (H I) of dark matter haloes, which is a key input into the calculation of the H I intensity mapping signal expected from the large-scale structure of the Universe. We find that the H I mass–halo mass relation displays a clear break at the halo mass above which AGN heating suppresses gas cooling, ≈3 × 1011h−1 M⊙. Below this halo mass, the H I content of haloes is dominated by the central galaxy; above this mass it is the combined H I content of satellites that prevails. We find that the H I mass–halo mass relation changes little with redshift up to z = 3. The bias of H I sources shows a scale dependence that gets more pronounced with increasing redshift.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/sty3427
Publisher statement:© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:14 December 2018
Date deposited:23 January 2019
Date of first online publication:18 December 2018
Date first made open access:23 January 2019

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