Galaxy formation in the Planck Millennium: the atomic hydrogen content of dark matter haloes
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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.
Original language | English |
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Pages (from-to) | 4922–4937 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 483 |
Issue number | 4 |
Early online date | 18 Dec 2018 |
DOIs | |
Publication status | Published - 11 Mar 2019 |
Documents
- Galaxy formation in the Planck Millennium
Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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