Dynamical constant mass-to-light ratio models of NGC 5128

Details Dynamical constant mass-to-light ratio models of NGC 5128 Dynamical constant mass-to-light ratio models of NGC 5128

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...514a..95s&link_type=abstract

Astronomy and Astrophysics, Volume 514, id.A95

Astronomy and Astrophysics

Astrophysics

1

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Kinematics And Dynamics, Galaxies: Halos

Scientific paper

Context. The existence and amount of dark matter in early-type galaxies remains a hotly debated topic. We study dynamical models of NGC 5128, which do not include dark matter, to test the predictions of different constant mass-to-light models. Aims: We use the measurements of the radial velocities of the planetary nebulae in NGC 5128 to test the predictions of Newtonian constant mass-to-light ratio models and we also extend our study to different MOND models. Methods: The planetary nebulae of NGC 5128 were used as a tracer of the galaxy's gravitational potential. The Jeans equation was calculated for both the Newtonian mass-follows-light and the MOND approaches. Spherical symmetry is assumed and the calculations are performed for both isotropic and anisotropic cases. Results: We solved the Jeans equation in spherical approximation and found that the isotropic Newtonian mass-follows-light models without dark matter may provide successful fits out to 6.4Re; to obtain a good fit in the outermost region (~ 10.7Re) one needs either dark matter or tangential anisotropies. Concerning MOND models we found that no isotropic MOND model without dark matter can provide a successful fit interior to ~ 6.4Re; for the anisotropic MOND models interior to ~40 arcmin only “standard” MOND model with tangential anisotropies can provide a successful fit of the observed velocity dispersion without the need of dark matter.

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