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Lopsidedness of cluster galaxies in modified gravity

Research output: Contribution to journalArticlepeer-review

Author(s)

Xufen Wu, Hongsheng Zhao, Benoit Famaey

School/Research organisations

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.

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Original languageEnglish
Article number010
JournalJournal of Cosmology and Astroparticle Physics
Volume2010
Issue number6
DOIs
Publication statusPublished - 2 Jul 2010

    Research areas

  • galaxy dynamics, galaxy morphology, Modified gravity

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