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

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

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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.
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

Keywords

  • RCUK
  • STFC
  • ST/P000541/1
  • ST/K00042X/1
  • ST/H008519/1
  • ST/K003267/1

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