X-ray group and cluster mass profiles in MOND

Unexplained mass on the group scale

G. W. Angus, B. Famaey, D. A. Buote

    Research output: Contribution to journalArticle

    56 Citations (Scopus)

    Abstract

    Although very successful in explaining the observed conspiracy between the baryonic distribution and the gravitational field in spiral galaxies without resorting to dark matter (DM), the modified Newtonian dynamics (MOND) paradigm still requires DM in X-ray bright systems. Here, to get a handle on the distribution and importance of this DM, and thus on its possible form, we deconstruct the mass profiles of 26 X-ray emitting systems in MOND, with temperatures ranging from 0.5 to 9 keV. Initially, we compute the MOND dynamical mass as a function of radius, then subtract the known gas mass along with a component of galaxies which include the cD galaxy with M/L K = 1. Next, we test the compatibility of the required DM with ordinary massive neutrinos at the experimental limit of detection (m ν = 2 eV), with density given by the Tremaine-Gunn limit. Even by considering that the neutrino density stays constant and maximal within the central 100 or 150 kpc (which is the absolute upper limit of a possible neutrino contribution there), we show that these neutrinos can never account for the required DM within this region. The natural corollary of this finding is that, whereas clusters (T ≳ 3 keV) might have most of their mass accounted for if ordinary neutrinos have a 2 eV mass, groups (T ≲ 2 keV) cannot be explained by a 2 eV neutrino contribution. This means that, for instance, cluster baryonic dark matter (CBDM, Milgrom) or even sterile neutrinos would present a more satisfactory solution to the problem of missing mass in MOND X-ray emitting systems.

    Original languageEnglish
    Pages (from-to)1470-1480
    Number of pages11
    JournalMonthly Notices of the Royal Astronomical Society
    Volume387
    Issue number4
    DOIs
    Publication statusPublished - Jul 2008

    Fingerprint

    neutrinos
    dark matter
    profiles
    x rays
    galaxies
    spiral galaxies
    guy wires
    gravitational fields
    compatibility
    radii
    gas
    gases
    temperature
    distribution

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

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    abstract = "Although very successful in explaining the observed conspiracy between the baryonic distribution and the gravitational field in spiral galaxies without resorting to dark matter (DM), the modified Newtonian dynamics (MOND) paradigm still requires DM in X-ray bright systems. Here, to get a handle on the distribution and importance of this DM, and thus on its possible form, we deconstruct the mass profiles of 26 X-ray emitting systems in MOND, with temperatures ranging from 0.5 to 9 keV. Initially, we compute the MOND dynamical mass as a function of radius, then subtract the known gas mass along with a component of galaxies which include the cD galaxy with M/L K = 1. Next, we test the compatibility of the required DM with ordinary massive neutrinos at the experimental limit of detection (m ν = 2 eV), with density given by the Tremaine-Gunn limit. Even by considering that the neutrino density stays constant and maximal within the central 100 or 150 kpc (which is the absolute upper limit of a possible neutrino contribution there), we show that these neutrinos can never account for the required DM within this region. The natural corollary of this finding is that, whereas clusters (T ≳ 3 keV) might have most of their mass accounted for if ordinary neutrinos have a 2 eV mass, groups (T ≲ 2 keV) cannot be explained by a 2 eV neutrino contribution. This means that, for instance, cluster baryonic dark matter (CBDM, Milgrom) or even sterile neutrinos would present a more satisfactory solution to the problem of missing mass in MOND X-ray emitting systems.",
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    X-ray group and cluster mass profiles in MOND : Unexplained mass on the group scale. / Angus, G. W.; Famaey, B.; Buote, D. A.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 387, No. 4, 07.2008, p. 1470-1480.

    Research output: Contribution to journalArticle

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