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

Research output: Contribution to journalArticle

  • C. M. Baugh
  • Violeta Gonzalez-Perez
  • Claudia del P. Lagos
  • Cedric G. Lacey
  • John C. Helly
  • Adrian Jenkins
  • Carlos S. Frenk
  • Andrew J. Benson
  • Richard G. Bower
  • Shaun Cole
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 languageEnglish
Pages (from-to)4922–4937
JournalMonthly Notices of the Royal Astronomical Society
Volume483
Issue number4
Early online date18 Dec 2018
DOIs
Publication statusPublished - 11 Mar 2019

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  • 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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