Hawking radiation from charged black holes via gauge and gravitational anomalies

Extending the method of Robinson and Wolczek, we show that in order to avoid a breakdown of general covariance and gauge invariance at the quantum level the total flux of charge and energy in each outgoing partial wave of a charged quantum field in a Reissner-Nordstrom black hole background must be equal to that of a (1+1)-dimensional blackbody at the Hawking temperature with the appropriate chemical potential.