This dissertation is mainly about the jet emission of blazars. This issue is studied in the following two ways. The first way is to study the properties of the jet emission through multi-band properties. The second way is to study through the jet’s links with other objects of AGN, like the black hole and the accretion disk, or with other jets at different scales, like jets of X-ray binaries or of Galactic radio sources. The first part can be divided into two projects. In the first project, the dominant emission mechanism of the higher energy component of blazar SEDs is discussed in three different ways. The results all favor a model that attributes the emission of the discussed component to Inverse-Compton scattering on photons external to the jet. In the second project the fundamental plane of black hole(FPBH) usually only valid for sub-Eddington systems has been showed to be applied also to Flat Spectrum Radio Quasar(FSRQ), which belong to the sub-Eddington systems, in a SDSS sample. This result might suggest that the FPBH is robust regardless the accretion mode. Furthermore, the optical thin luminosity of each source has been calculated from the synchrotron peak frequency and peak luminosity therefore a link between the FPBH and the blazar sequence has also been found. This provides some interesting results such as the usual anti-correlation between the peak luminosity and the peak frequency, the smaller black hole mass’ correspondence to lower peak luminosity and lower peak frequency sources. This connection might be revealed for the first time. The second part is dealing with one of the most important properties of blazars, the Doppler factor. It can be divided into three projects. In the first project we show that there exists a significant correlation between the jet power indicator (νL )peak Syn;obs and the disk power indicator LBLR even after the Doppler enhancement of the synchrotron emission is removed, and this result suggests a close link between the jet powering process and the disk accreting process. In the second project we report a confirm of the significant correlation between the black hole masses and doppler factors employing a large sample of blazars, which is in agreement with previous results while our sample is the largest by far. In the third project, we show that there exist a significant correlation between δ and LBLR, which supports the idea that the jet powering process is closely linked with the accretion process and provides a new evidence for disk-jet connection.
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