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

Baugh, CM; Gonzalez-Perez, Violeta; Lagos, Claudia DP; Lacey, Cedric G; Helly, John C; Jenkins, Adrian; Frenk, Carlos S; Benson, Andrew J; Bower, Richard G; Cole, Shaun

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


Authors

Violeta Gonzalez-Perez

Claudia DP Lagos

John C Helly

Adrian Jenkins

Carlos S Frenk

Andrew J Benson

Richard G Bower

Shaun Cole



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.

Citation

Baugh, C., Gonzalez-Perez, V., Lagos, C. D., Lacey, C. G., Helly, J. C., Jenkins, A., …Cole, S. (2019). Galaxy formation in the Planck Millennium: the atomic hydrogen content of dark matter haloes. Monthly Notices of the Royal Astronomical Society, 483(4), 4922-4937. https://doi.org/10.1093/mnras/sty3427

Journal Article Type Article
Acceptance Date Dec 14, 2018
Online Publication Date Dec 18, 2018
Publication Date Mar 11, 2019
Deposit Date Jan 22, 2019
Publicly Available Date Mar 29, 2024
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 483
Issue 4
Pages 4922-4937
DOI https://doi.org/10.1093/mnras/sty3427

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Copyright Statement
© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.





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