Baryon effects on void statistics in the EAGLE simulation

Enrique Paillas, Claudia D. P. Lagos, Nelson Padilla, Patricia Tissera, John Helly, Matthieu Schaller

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    Cosmic voids are promising tools for cosmological tests due to their sensitivity to dark energy, modified gravity and alternative cosmological scenarios. Most previous studies in the literature of void properties use cosmological N-body simulations of dark matter (DM) particles that ignore the potential effect of baryonic physics. Using a spherical underdensity finder, we analyse voids using the mass field and subhalo tracers in the Evolution and Assembly of Galaxies and their Environment (EAGLE) simulations, which follow the evolution of galaxies in a I > cold dark matter universe with state-of-the-art subgrid models for baryonic processes in a (100 cMpc)(3) volume. We study the effect of baryons on void statistics by comparing results with DM-only simulations that use the same initial conditions as EAGLE. When identifying voids in the mass field, we find that a DM-only simulation produces 24 per cent more voids than a hydrodynamical one due to the action of galaxy feedback polluting void regions with hot gas, specially for small voids with r(void)

    Original languageEnglish
    Pages (from-to)4434-4452
    Number of pages19
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number4
    Publication statusPublished - Oct 2017

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