Does the LMC Possess a Dark Bulge?

Details Does the LMC Possess a Dark Bulge? Does the LMC Possess a Dark Bulge?

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002arep...46..173z&link_type=abstract

Astronomy Reports, Volume 46, Issue 3, March 2002, pp.173-181

Astronomy and Astrophysics

Astronomy

5

Scientific paper

A series of numerical dynamical models for the LMC are constructed in order to fit the observed rotational velocities and stellar velocity dispersions at various galactocentric distances. The models include a three-dimensional spherical disk and nonevolving spherical components with various relative masses. The two LMC rotation curves presented by Kim et al. (1998) and Sofue (2000), which differ strongly in the inner region of the galaxy, are compared. The latter curve requires the presence of a massive dark bulge. Models based on the rotation curve of Sofue (2000) cannot account for the observed velocity dispersion or the presence of a long-lived bar in the galaxy. A model with no dark bulge is in good agreement with the observations if we assume that the disk dominates over the halo in terms of the mass within the optical radius (about 7 kpc).

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