The Correlation between the Gamma-Ray Luminosity and the Core-Dominance Parameters for a Fermi Blazar Sample

In this work, we investigated the correlation between the γ-ray luminosity, logL _γ and the core-dominance parameter, log (1+R), for a sample of 124 Fermi blazars with available core and extended radio emissions. Our analysis shows that there is no correlation between the γ-ray luminosity, log L _γ and the core-dominance parameter, log (1+R). However, there is a closely linear correlation between log L _γ - log L _Ext and log (1+R), log L _γ-log L _Ext = (0.95 +/- 0.08) log (1+R) + (2.72 +/- 0.11), for the whole sample. The result suggests that the γ-ray emissions are composed of two components, one is beamed, the other is unbeamed.