Analytical Modeling of Galaxies at z>~6: Star Formation and Black Hole
  Growth
  Galaxies at z>~6 represent an important evolutionary link between the first
galaxies and their modern counterparts. Modeling both the global and internal
properties of these recently discovered objects can lead us to understand how
they relate to even earlier systems. I show how the balance of cold inflows and
momentum-driven super-winds can explain the evolution of the UV mass-to-light
ratio from z~6--10. I then describe a model for maintaining hydrostatic
equilibrium and marginal Toomre-instability by radiation pressure in dust-free
galactic disks. Applying this framework to z~6--8 systems, I show how the
internal ISM physics can be constrained by X-rays observations with Chandra.
