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

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AU - Famaey, Benoit

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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