The MOND Fundamental Plane
V.F. Cardone, G. Angus, A. Diaferio, C. Tortora, R. Molinaro

TL;DR
This paper demonstrates that Modified Newtonian Dynamics (MOND) can successfully fit the velocity dispersion data of early-type galaxies and predict a fundamental plane relation, offering an alternative to dark matter-based models.
Contribution
It shows that MOND can reproduce the fundamental plane of early-type galaxies, extending its applicability beyond spiral galaxies and dark matter frameworks.
Findings
MOND fits observed central velocity dispersions of ETGs.
MOND predicts a fundamental plane relation among galaxy parameters.
A tilt exists between observed and MOND-predicted fundamental planes.
Abstract
Modified Newtonian Dynamics (MOND) has been shown to be able to fit spiral galaxy rotation curves as well as giving a theoretical foundation for empirically determined scaling relations, such as the Tully - Fisher law, without the need for a dark matter halo. As a complementary analysis, one should investigate whether MOND can also reproduce the dynamics of early - type galaxies (ETGs) without dark matter. As a first step, we here show that MOND can indeed fit the observed central velocity dispersion of a large sample of ETGs assuming a simple MOND interpolating functions and constant anisotropy. We also show that, under some assumptions on the luminosity dependence of the Sersic n parameter and the stellar M/L ratio, MOND predicts a fundamental plane for ETGs : a log - linear relation among the effective radius , and the mean effective intensity $\langle…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Cosmology and Gravitation Theories
