LOWERED NONEXTENSIVE STELLAR DISTRIBUTION
R.E. de Souza
Instituto
de Astronomia, Geofísica e Ciências Atmosféricas
Universidade
de São Paulo, Brasil
The structure of globular
clusters and elliptical galaxies are described in an unified way trough a new
class of lowered models inspired on the nonextensive kinetic theory. These
power law models are specified by a single parameter q which quantifies to what
extent they depart from the class of lowered stellar distributions discussed by
Michie and King. For q=1 the Michie-King profiles are recovered. However, for
q<1 there is a gradual modification in the shape of the density profiles
which depends on the degree of tidal damage imposed on the model, thereby also
providing a good fit for globular clusters. It is also shown that a subclass of
these models, those with a deeper potential and q slightly less than 1, present
a distribution resembling the de Vaucoulers r1/4 profile which
yields a good description of the structure of elliptical galaxies. This subset
of models follows this trend, with a slight departure over nearly 10 orders of
magnitudes.