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\subsubsection{FIRST and synchrotron radiation - this section is incomplete}  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 FIRST survey detects  synchrotron process, especially radiation  at the lower radio frequencies in the metre meter  and cm wavelengthrange. This  range is detected by the FIRST survey. (http://www.ugr.es/~battaner/escritos/granada_paper.pdf) as explained in section 1.2.