1.
Spine-sheath jet model for low-luminosity AGNsMargot Boughelilba,
Anita Reimer,
Lukas Merten,
Jon Paul Lundquist, 2023, published scientific conference contribution
Abstract: In several jetted AGNs, structured jets have been observed. In particular spine-sheath configurations
where the jet is radially divided into two or more zones of different flow velocities.
We present a model based on the particle and radiation transport code CR-ENTREES. Here,
interaction rates and secondary particle and photon yields are pre-calculated by Monte Carlo
event generators or semi-analytical approximations. These are then used to create transition
matrices, that describe how each particle spectrum evolves with time. This code allows for
arbitrary injection of primary particles, and the possibility to choose which interaction to include
(photo-meson production, Bethe-Heitler pair-production, inverse-Compton scattering, �-� pair
production, decay of all unstable particles, synchrotron radiation — from electrons, protons, and
all relevant secondaries before their respective decays — and particle escape).
In addition to the particle and radiation interactions taking place in each homogeneous zone, we
implement the feedback between the two zones having different bulk velocities. The main mechanism
at play when particles cross the boundary between the two zones is shear acceleration. We
follow a microscopic description of this acceleration process to create a corresponding transition
matrix and include it in our numerical setup. Furthermore, each zone’s radiation field can be
used as an external target photon field for the other zone’s particle interactions. We present here
the first results of the effect of a two-zone spine-sheath jet, by applying this model to typical
low-luminosity AGNs.
Keywords: active galactic nuclei, low-luminosity jetted AGN, spine-sheath jet structure
Published in RUNG: 24.08.2023; Views: 650; Downloads: 4
Full text (461,21 KB)
This document has many files! More...
