  We present numerically exact predictions of the periodic and single-impurity
Anderson models to address photoemission experiments on heavy Fermion systems.
Unlike the single impurity model the lattice model is able to account for the
enhanced intensity, dispersion, and apparent weak temperature dependence of the
Kondo resonant peak seen in recent controversial photoemission experiments. We
present a consistent interpretation of these results as a crossover from the
impurity regime to an effective Hubbard model regime described by Nozieres.
