Loss of mass and stability of galaxies in modified Newtonian dynamics

Xufen Wu, HongSheng Zhao, Benoit Famaey, G. Gentile, O. Tiret, F. Combes, G. W. Angus, A. C. Robin

    Research output: Contribution to journalArticle

    41 Citations (Scopus)

    Abstract

    The self-binding energy and stability of a galaxy in MOND-based gravity are curiously decreasing functions of its center-of-mass acceleration (of the order of 10-12 to 1010 m s-2) toward neighboring mass concentrations. A tentative indication of this breaking of the strong equivalence principle in field galaxies is the RAVE-observed escape speed in the Milky Way. Another consequence is that satellites of field galaxies will move on nearly Keplerian orbits at large radii (100-500 kpc), with a declining speed below the asymptotically constant naive MOND prediction. But the consequences of an environment-sensitive gravity are even more severe in clusters, where member galaxies accelerate fast; no dark halo-like potential is present to support galaxies, meaning that extended axisymmetric disks of gas and stars are likely unstable. These predicted reappearances of asymptotic Keplerian velocity curves and disappearances of "stereotypic galaxies" in clusters are falsifiable with targeted surveys.

    Original languageEnglish
    JournalAstrophysical Journal
    Volume665
    Issue number2 PART 2
    DOIs
    Publication statusPublished - 2007

    Fingerprint

    gravity
    galaxies
    prediction
    gas
    gravitation
    energy
    escape
    center of mass
    equivalence
    loss
    speed
    halos
    indication
    binding energy
    orbits
    stars
    radii
    curves
    predictions
    gases

    All Science Journal Classification (ASJC) codes

    • Space and Planetary Science
    • Astronomy and Astrophysics
    • Nuclear and High Energy Physics

    Cite this

    Wu, X., Zhao, H., Famaey, B., Gentile, G., Tiret, O., Combes, F., ... Robin, A. C. (2007). Loss of mass and stability of galaxies in modified Newtonian dynamics. Astrophysical Journal, 665(2 PART 2). https://doi.org/10.1086/521103
    Wu, Xufen ; Zhao, HongSheng ; Famaey, Benoit ; Gentile, G. ; Tiret, O. ; Combes, F. ; Angus, G. W. ; Robin, A. C. / Loss of mass and stability of galaxies in modified Newtonian dynamics. In: Astrophysical Journal. 2007 ; Vol. 665, No. 2 PART 2.
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    Wu, X, Zhao, H, Famaey, B, Gentile, G, Tiret, O, Combes, F, Angus, GW & Robin, AC 2007, 'Loss of mass and stability of galaxies in modified Newtonian dynamics', Astrophysical Journal, vol. 665, no. 2 PART 2. https://doi.org/10.1086/521103

    Loss of mass and stability of galaxies in modified Newtonian dynamics. / Wu, Xufen; Zhao, HongSheng; Famaey, Benoit; Gentile, G.; Tiret, O.; Combes, F.; Angus, G. W.; Robin, A. C.

    In: Astrophysical Journal, Vol. 665, No. 2 PART 2, 2007.

    Research output: Contribution to journalArticle

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    AU - Wu, Xufen

    AU - Zhao, HongSheng

    AU - Famaey, Benoit

    AU - Gentile, G.

    AU - Tiret, O.

    AU - Combes, F.

    AU - Angus, G. W.

    AU - Robin, A. C.

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    Wu X, Zhao H, Famaey B, Gentile G, Tiret O, Combes F et al. Loss of mass and stability of galaxies in modified Newtonian dynamics. Astrophysical Journal. 2007;665(2 PART 2). https://doi.org/10.1086/521103