Lopsidedness of cluster galaxies in modified gravity

Abstract

We point out an interesting theoretical prediction for elliptical galaxies residing inside galaxy clusters in the framework of modified Newtonian dynamics (MOND), that could be used to test this paradigm. Apart from the central brightest cluster galaxy, other galaxies close enough to the centre experience a strong gravitational influence from the other galaxies of the cluster. This influence manifests itself only as tides in standard Newtonian gravity, meaning that the systematic acceleration of the centre of mass of the galaxy has no consequence. However, in the context of MOND, a consequence of the breaking of the strong equivalence principle is that the systematic acceleration changes the own self-gravity of the galaxy. We show here that, in this framework, initially axisymmetric elliptical galaxies become lopsided along the external field's direction, and that the centroid of the galaxy, defined by the outer density contours, is shifted by a few hundreds parsecs with respect to the densest point.

accepted for publication in JCAP

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Cited by in corpus (17)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• Star Clusters in Evolving Galaxies
• RAyMOND: An N-body and hydrodynamics code for MOND
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• Stellar streams as gravitational experiments I. The case of Sagittarius
• The global stability of M33 in MOND
• Remarks on the properties of elliptical galaxies in modified Newtonian dynamics
• The dynamical phase transitions of stellar systems and the corresponding kinetimacs
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• Lopsidedness of self-consistent galaxies by the external field effect of clusters
• Separable triaxial potential-density pairs in MOND
• Gas expulsion in MOND: the possible origin of diffuse globular clusters and ultra-faint dwarf galaxies
• Distribution of Phantom Dark Matter in Dwarf Spheroidals
• Formation of collisional ring galaxies in Milgromian dynamics
• The tidal features of the classical Milky Way satellites: Expected in MOND but inconsistent with cold dark matter models