Journal article
The impact of feedback and the hot halo on the rates of gas accretion on to galaxies
CA Correa, J Schaye, F van de Voort, AR Duffy, JSB Wyithe
Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2018
DOI: 10.1093/mnras/sty871
Abstract
We investigate the physics that drives the gas accretion rates on to galaxies at the centres of dark matter haloes using the EAGLE suite of hydrodynamical cosmological simulations. We find that at redshifts z ≤ 2, the accretion rate on to the galaxy increases with halo mass in the halo mass range 1010-1011.7M⊙, flattens between the halo masses 1011.7 and 1012.7M⊙, and increases again for higher mass haloes. However, the galaxy gas accretion does not flatten at intermediate halo masses when active galactic nucleus (AGN) feedback is switched off. To better understand these trends, we develop a physically motivated semi-analytic model of galaxy gas accretion. We show that the flattening is prod..
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Awarded by Klaus Tschira Stiftung
Funding Acknowledgements
We are grateful to the EAGLE team for putting together a great set of simulations. This work used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk). This equipment was funded by BIS National E-infrastructure capital grant ST/K00042X/1, STFC capital grant ST/H008519/1, and STFC DiRAC Operations grant ST/K003267/1 and Durham University. DiRAC is part of the National E-Infrastructure. The EAGLE simulations were performed using the DiRAC-2 facility at Durham, managed by the ICC, and the PRACE facility Curie based in France at TGCC, CEA, Bruyeres-le-Chatel. This work was supported by the Netherlands Organization for Scientific Research (NWO) through VICI grant 639.043.409. FvdV acknowledges the Klaus Tschira Foundation. We thank the anonymous reviewer for fruitful comments that improved the original manuscript.