The inhomogeneous jet parameters in active galactic nuclei

The Konigl inhomogeneous jet model is applied to investigate the properties of the jets in active galactic nuclei (AGNs). A sample of AGNs that includes measurements of the angular size and radio flux density of the VLBI core, proper motion of the components in the jet, and X-ray flux density is collected. The inhomogeneous jet parameters are derived with the same assumptions for all sources. A comparison among the parameters of different types of sources in the sample is presented. It is found that most of EGRET sources have higher Doppler factors delta, larger Lorentz factors gamma, and smaller viewing angles theta as compared to the other sources in the sample. The statistical analyses show that the derived Doppler factor delta is strongly correlated with the observed 22 GHz brightness temperature. Furthermore, there is a correlation between the relative gamma-ray luminosity and the Doppler factor delta. The implications of these results are discussed.