Mar. 28/03/2017 14:00 Andromede, Bâtiment 11, Etage 3
VIEYRO Florencia (Barcelona University) Collective non-thermal emission from an extragalactic jet interacting with stars
The central regions of galaxies are complex environments, rich in evolved and/or massive stars. For galaxies hosting an active galactic nucleus with jets, the interaction of the jets with the winds of the stars can lead to particle acceleration, and to extended high-energy emitting regions.
In this work, we compute the non-thermal emission produced by the jet flow shocked by stellar winds on the jet scale. First, prescriptions for the winds of the relevant stellar populations in different types of galaxies are obtained. Then, we estimate the available energy to accelerate particles in the jet shock, and study the transport and energy evolution of the accelerated electrons, plus their gamma-ray emission.
We obtain that a significant fraction of the jet energy can potentially be available for the particles accelerated in jet-wind shocks in the studied cases. The non-thermal particles can produce most of the high-energy radiation on jet scales, far from the jet-star direct interaction region. This high-energy emission will be strongly enhanced in jets aligned with the line of sight due to Doppler boosting effects.