Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pobeo..86..341s&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 86, pp. 341-345
Astronomy and Astrophysics
Astronomy
Scientific paper
The kinematics of the early-type galaxy NGC 4649 (M60) is used in order to compare the predictions of two different approaches regarding the existence of unseen matter in its outer parts: modified Newtonian dynamics (MOND) and the classical Newtonian dynamics. We use the recently published kinematical data of NGC 4649 out to ˜ 6R_{e} (where R_{e} is the effective radius) which were obtained using globular clusters (GCs) to calculate the full velocity profile. We then compare thus obtained values of the velocity dispersion with the predictions of the spherical Jeans equation. We show that the Jeans models based on the constant mass-to-light ratio model and different MOND models provide a good agreement with the observed values of the velocity dispersion. The best fits of the velocity dispersion were obtained using the mass-to-light ratio in the B-band equal to 7 implying that there is no need for large amounts of dark matter in the outer parts (beyond ˜ 3R_{e}) of this galaxy. We also find that tangential anisotropies are present in NGC 4649.
Cirkovic Milan M.
Samurovic Srdjan
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