On the Ionizing Sources in Spiral Galaxies: II. the Center of the Milky   Way
  In this paper we present the ionization in the center of the Galaxy. We use Taylor & Cordes (1993) and Lazio & Cordes (1998) models to obtain the overall contribution of the Galactic center (GC) component to the total electron density. We also discuss local contributions from the GC area that come from a complex set of sources. Finally, we discuss the nature of SgrA*. 
V. Milosevic-Zdjelar, S. Samurovic and M. M. Cirkovic