| Active Galactic Nucleus (AGNs) have been an important branch and one of the most active frontiers in the field of modern astrophysics. It is related to the most fundamental problems in astrophysics .The study of AGNs play an important role in the study of the origin of energy, radiation mechanism and cosmology. Blazars are one of the most extreme classes of active galactic nucleus, with high luminosity, large amplitude and rapid variability, high and variable polarization, radio core-dominance, and apparent superluminal speeds. Their broad band emission extends from radio up to γ-ray band, and is dominated by non-thermal process. Therefore, many people devote themselves to the theoretical and observational studies in this field.In the thesis, we summarize the defined character and classification of active galaxies nucleus (AGNs), present unified schemes of AGNs. Especially, we focus on the multiwavebands observations, the properties of multiwavebands spectral energy distributions (SEDs), the radiation mechanism and the theoretical radiation model of Blazar .Using collected 66 gamma-ray-loud blazars from the most recent EGRET data base (19 BL Lac objects and 47 flat-spectrum radio quasars (FSRQs)) with observed data in multiwavebands, we investigate the distribution of redshift and flux densities for different wavebands. Finally, we studied the possible correlations of flux densities for different (radio, near-infrared, optical, X -ray and gamma-ray) wavebands in low and high state. |
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