Guillermo A. González, J. Ibáñez, Jerson I. Reina
A family of models of thin discs and spheroidal haloes with masses in a
linear relationship is presented. The models are obtained by considering the
gravitational potential as the superposition of two independent components, a
potential generated by the thin galactic disc and a potential generated by the
spheroidal halo. The models leads to an expression for the circular velocity
that can be adjusted very accurately to the observed rotation curves of some
specific galaxies, in such a way that the models are stable against radial and
vertical perturbations. Two particular models for galaxies NGC4389 and UGC6969
are obtained by adjusting the circular velocity with data taken from the recent
paper by Verheijen & Sancici (2001). The values of the halo mass, the disc mass
and the total mass for these two galaxies are computed in such a way that we
obtain a very narrow interval of values for these quantities. Furthermore, the
values of masses here obtained are in perfect agreement with the expected order
of magnitude and with the relative order of magnitude between the halo mass and
the disc mass.
View original:
http://arxiv.org/abs/1111.3852
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