The First Galaxies and the Likely Discovery of Their Fossils in the Local Group
Figure 6
The top panels show the surface brightness (black point) and luminosity density (gray points) radial profiles for 3 galaxies from among the most massive dwarf galaxies extracted from the RG05 simulation at . We have evolved the stellar population passively to . The simulated galaxies shown in this figure have a stellar spheroid similar to Draco and Umi already in place at the time of formation (i.e., the spheroid is not produced by tidal effects). The bottom panels show the velocity dispersion profiles of the dark matter (gray points) and of the stars (black points) for the same 3 galaxies. The velocity dispersion of the stars is split in the radial and tangential components. All quantities are spherically averaged because the dark matter and stars have nearly spherical symmetry.
