Relativistic jets powered in Active Galaxies are responsible for non-thermal emission, which covers the whole electromagnetic spectrum.

Furthermore, as explained in Chapter 1, the radiation in the high and low energy ranges are connected, being the result of the same electron population radiation. Thus, to investigate radiation and acceleration mechansims, we created multifrequency SED for all radiogalaxies and Narrow-Line Seyfert 1 (NLSy1) galaxies detected in the first 4 years of Fermi-LAT operation period.The Fermi-LAT operates since August 2008 gathering high energy data from both Galactic and extragalactic objects and working with scanning mode. In the same time, since 2007, Swift also study AGNs in optical/UV, X-ray and ?-ray bands, extending up to 150 keV.

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Initially, this mission is dedicated for studying Gamma-ray bursts (GRBs), but many non-GRB, including radiogalaxies, has been detected. Combination these data with radio archival data, we enable to study radiogalaxies in wide energy range. What matters is that, two humps in the multifrequency SED of radiogalaxies are located in the same bands we observe. 2.2. Data Acquisition Based on Fermi-LAT publicy available data, we stydied all radiogalaxies and three variable NLSy1 galaxies, which are icluded in the FERMI-LAT 4-year Point Source Catalog (3FGL). The observations for the most sources were performed only in ?-ray band, accumulating data from the first 7 years of Fermi-LAT operation (from August 4, 2008 to August 4, 2015). Some variabile radiogalaxies (NGC 1275 and PKS0625-35) and three NLSy1s were studied based on more than eight years collected data.

For these sources, we performed also Optical/UV and soft X-ray monitoring using the data obtained from Ultraviolet/Optical Telescope (UVOT) and X-ray Telescope (XRT) instruments on the board of Neil Gehrels Swift Observatory. The archival radio data, with the same Fermi Lat observational period, is taken from ASI Science Data Center. These long period radio data don’t dramatically influence on our observations within monthly periods, because the variability in this band is not noticable in such short periods.