Resumen
Understanding and observing the sources contributing to the extragalactic background at all wavelengths has become one of the most rapidly evolving fields in observational cosmology since the discovery of the Cosmic Infrared Background (CIB, Puget et al, 1996; Hauser & Dwek, 2000). Cosmological surveys conducted from space with ISO (Infrared Space Observatory) and from the ground in the mm/submm range, together with observations at other wavelengths for source identification, begin to provide a global view of galaxy evolution. In particular, ISO (Genzel & Cesarsky, 2000, Franceschini et al, 2001) performed many deep surveys in the mid and far infrared, mainly at 15 mu m (Elbaz et al, 2002) and at 170 mu m (Dole et al, 2001).
