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.