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Title:
MOND vs. Newtonian dynamics in early-type galaxies. The case of NGC 4649 (M60)
Authors:
Samurović, S.; Ćirković, M. M.
Affiliation:
AA(Astronomical Observatory, Volgina 7, 11160 Belgrade, Serbia ), AB(Astronomical Observatory, Volgina 7, 11160 Belgrade, Serbia )
Publication:
Astronomy and Astrophysics, Volume 488, Issue 3, 2008, pp.873-877 (A&A Homepage)
Publication Date:
09/2008
Origin:
EDP
Keywords:
gravitation, galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, galaxies: halos, galaxies: individual: NGC 4649
DOI:
10.1051/0004-6361:200809524
Bibliographic Code:
2008A&A...488..873S

Abstract

Context: Regarding the significant interest in both dark matter and the application of MOND to early-type galaxies, we investigate the MOND theory by comparing its predictions, for models of constant mass-to-light ratio, with observational data of the early-type galaxy NGC 4649. Aims: We study whether measurements for NGC 3379 and NGC 1399 are typical of early-type systems and we test the assumption of a Newtonian constant M/L ratio underlying most of the published models. Methods: We employ the globular clusters of NGC 4649 as a mass tracer. The Jeans equation is calculated for both MOND and constant mass-to-light ratio assumptions. Spherical symmetry is assumed and the calculations are performed for both isotropic and anisotropic cases. Results: We found that both Jeans models with the assumption of a constant mass-to-light ratio and different MOND models provide good agreement with the observed values of the velocity dispersion. The most accurate fits of the velocity dispersion were obtained for the mass-to-light ratio in the B-band, which was equal to 7, implying that there is no need for significant amounts of dark matter in the outer parts (beyond 3 effective radii) of this galaxy. We also found that tangential anisotropies are most likely present in NGC 4649.
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