RAiSE: simulation-based analytical model of AGN jets and lobes

ABSTRACT We present an analytical model for the evolution of extended active galactic nuclei (AGNs) throughout their full lifecycle, including initial jet expansion, lobe formation, and eventual remnant phases. A particular focus our contribution is on early expansion phase, which traditionally not well captured in models. implement this within Radio AGN Semi-Analytic Environments (RAiSE) framework, find that predicted radio source dynamics are good agreement with hydrodynamic simulations both low-powered Fanaroff-Riley Type-I high-powered Type-II lobes. construct synthetic synchrotron surface brightness images by complementing original RAiSE magnetic field shock-acceleration histories a set Lagrangian tracer particles taken from existing simulation. show single sufficient accurate description observable features lobes very different parameters ambient density profile normalizations. Our new predicts young (≲10 Myr) sources will be longer brighter than expected at same age models, lack jet-dominated phase; finding has important implications interpretation galaxy observations. The code, written python, publicly available github pypi.