The modified Newtonian dynamics Fundamental Plane

Journal article

Authors / Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Cardone VF, Angus G, Diaferio A, Tortora C, Molinaro R

Publisher: Oxford University Press

Place: HOBOKEN

Publication year: 2011

Journal: Monthly Notices of the Royal Astronomical Society (0035-8711)

Journal acronym: MON NOT R ASTRON SOC

Volume number: 412

Issue number: 4

Start page: 2617

End page: 2630

Number of pages: 14

ISSN: 0035-8711

eISSN: 1365-2966

Languages: English-Great Britain (EN-GB)

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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 Sigma(0) 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 mass-to-light ratio (M/L), MOND predicts a Fundamental Plane for ETGs: a loglinear relation among the effective radius R-eff, Sigma(0) and the mean effective intensity << I-e >>. However, we predict a tilt between the observed and the MOND Fundamental Planes.

Keywords

Dark matter, galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, gravitation

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