| Abstract: |
We describe the dynamical evolution of reversed shock regions (hot spots) in radio-loud active galactic nuclei (AGNs), taking into account of (1) the conservations of the mass, momentum and kinetic energy flux of the unshocked jet, (2) the deceleration process of the jet by shocks and (3) the cocoon expansion without assuming the constant aspect ratio of the cocoon. By the detailed comparison with 2D relativistic hydrodynamic simulations, we show that our model well reproduces the whole evolution of relativistic jets. We predict that the advance speed of hot spots strongly decelerate when the jets pass through the ambient medium in hosts, comparing with the observed relation between the hot spot radius and the size of radio sources. Based on our findings, we discuss the fate of young radio-loud AGNs which may impact on AGN feedback associated with AGN jets. |
