2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12748We study the ionizing sources in spiral galaxies and examine in more detail our Galaxy. Using Taylor & Cordes (1993) model we analyze the electron density in different parts of the Galaxy, and emphasize the still unsolved problems. Finally, we compare the intensities of H$α$ emission in disk and halo.5 pages, plain TeX, 1 figure, uses psfig, accepted as a contribution to the 19th Summer School and International Symposium of the Physics of Ionized Gases (SPIG), to be held at Zlatibor, Yugoslavia, August 31-September 4, 1998Astrophysicstext