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**Session 49 - Elliptical Galaxies & Bulges.**

*Display session, Thursday, January 08*

*Exhibit Hall, *

## [49.08] A Novel Hydrocode for Dwarf Elliptical Formation

*A. Slyz, K. Prendergast (Columbia U.)*
We incorporate gravity into a hydrodynamics code in which the gas
evolves via an approximation to the collisional Boltzmann equation, namely
the Bhatnagar-Gross-Krook (BGK) equation. Time-dependent
hydrodynamical fluxes are computed from local solutions of the
BGK equation. Because the BGK equation models collisions,
the fluxes are not merely advective but also carry dissipative terms.
Simulations were performed on an azimuthally symmetric cylindrical
grid with Poisson's equation solved on an overlapping spherical grid.
We present results of runs for a fixed gravitational potential
and for ones with self-gravity. With additional routines to account
for cooling and stellar processes, the code will be used to model
the formation of dwarf elliptical galaxies.

**Program
listing for Thursday**