Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...458...79s&link_type=abstract
Astronomy and Astrophysics, Volume 458, Issue 1, October IV 2006, pp.79-88
Astronomy and Astrophysics
Astrophysics
10
Galaxy: Kinematics And Dynamics, Galaxies: Elliptical, And Lenticular, Cd, Galaxies: Structure, Dark Matter, Galaxies: Individual: Ngc 1399, Galaxy: Star Clusters
Scientific paper
Context: .Of the various observational methods used to address the question of dark matter in early-type galaxies there is the possibility of spatial overlap in using kinematics of stars, clusters and X-ray halos. Aims: .To investigate methods for the determination of velocity distribution profiles and deviations from a Gaussian distribution using globular clusters in early-type galaxies, and the implications for dark matter. Methods: .The maximum likelihood method together with standard statistical procedures were used to calculate the velocity dispersion. A new "tracer mass estimator" was applied to obtain a mass estimate based on the globular clusters, which is then compared to the mass obtained using X-rays. Results: .In NGC 1399 the departures from a Gaussian distribution of the velocities at all radial distances are small. Our conclusion is that in spite of the observations that show that the velocity dispersion decreases between 4 and 10 Re there is evidence that dark matter exists beyond ˜ 3 R_e.
Danziger Ivan John
Samurovic Srdjan
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