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Only in the late 1940s the connection between cosmic radio waves and synchrotron emission could be established. Synchrotron emissions of AGN is due to the presence of magnetic fields. This emission is observable as polarized emission. Cosmic objects emit intense radio waves through the synchrotron emission. It is widely held that radio sources in the cosmic universe emit by the synchrotron process, especially at the lower radio frequencies in the metre and cm wavelength range. This range is detected by the FIRST survey. (http://www.ugr.es/~battaner/escritos/granada_paper.pdf)  \subsection{Results from previous publications. - this secton is incomplete}