The abundance of galaxy clusters in modified Newtonian dynamics

Cosmological simulations with massive neutrinos

G. W. Angus, Antonaldo Diaferio

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    We present a new particle mesh cosmological N-body code for accurately solving the modified Poisson equation of the quasi-linear formulation of modified Newtonian dynamics (MOND). We generate initial conditions for the Angus cosmological model, which is identical to Λ cold dark matter (ΛCDM) except that the CDM is switched for a single species of thermal sterile neutrinos. We set the initial conditions at z= 250 for a (512Mpch-1)3 box with 2563 particles, and we evolve them down to z= 0. We clearly demonstrate the ability of MOND to develop the large-scale structure in a hot dark matter cosmology and contradict the naive expectation that MOND cannot form galaxy clusters. We find that the correct order of magnitude of X-ray clusters (with TX > 4.5 keV) can be formed, but that we overpredict the number of very rich clusters and seriously underpredict the number of lower mass clusters. We present evidence that suggests the density profiles of our simulated clusters are compatible with those of the observed X-ray clusters in MOND. As a last test, we computed the relative velocity between pairs of haloes within 10 Mpc and find that pairs with velocities larger than 3000kms-1, like the bullet cluster, can form without difficulty.

    Original languageEnglish
    Pages (from-to)941-949
    Number of pages9
    JournalMonthly Notices of the Royal Astronomical Society
    Volume417
    Issue number2
    DOIs
    Publication statusPublished - Oct 2011

    Fingerprint

    neutrinos
    galaxies
    simulation
    dark matter
    cosmology
    Poisson equation
    boxes
    mesh
    halos
    x rays
    cold
    particle
    formulations
    profiles
    code
    test

    All Science Journal Classification (ASJC) codes

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

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    title = "The abundance of galaxy clusters in modified Newtonian dynamics: Cosmological simulations with massive neutrinos",
    abstract = "We present a new particle mesh cosmological N-body code for accurately solving the modified Poisson equation of the quasi-linear formulation of modified Newtonian dynamics (MOND). We generate initial conditions for the Angus cosmological model, which is identical to Λ cold dark matter (ΛCDM) except that the CDM is switched for a single species of thermal sterile neutrinos. We set the initial conditions at z= 250 for a (512Mpch-1)3 box with 2563 particles, and we evolve them down to z= 0. We clearly demonstrate the ability of MOND to develop the large-scale structure in a hot dark matter cosmology and contradict the naive expectation that MOND cannot form galaxy clusters. We find that the correct order of magnitude of X-ray clusters (with TX > 4.5 keV) can be formed, but that we overpredict the number of very rich clusters and seriously underpredict the number of lower mass clusters. We present evidence that suggests the density profiles of our simulated clusters are compatible with those of the observed X-ray clusters in MOND. As a last test, we computed the relative velocity between pairs of haloes within 10 Mpc and find that pairs with velocities larger than 3000kms-1, like the bullet cluster, can form without difficulty.",
    author = "Angus, {G. W.} and Antonaldo Diaferio",
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    The abundance of galaxy clusters in modified Newtonian dynamics : Cosmological simulations with massive neutrinos. / Angus, G. W.; Diaferio, Antonaldo.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 417, No. 2, 10.2011, p. 941-949.

    Research output: Contribution to journalArticle

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