Speaker
Anita Reimer
(University of Innsbruck)
Description
The non-thermal spectra of jetted Active Galactic Nuclei
(AGN) show a variety of shapes and degrees of curvature in
their low and high energy components. From some of the
brightest Fermi-LAT blazars prominent spectral breaks at
a few GeV have been regularly detected which is
inconsistent with conventional cooling effects. We
propose that the broad variety of spectral shapes
including prominent breaks can be understood as an impact
of injection modes.
We therefore present an injection
model embedded in a leptonic blazar emission model for
external Comptonloss dominated jets of AGN which aims
towards bridging jet emission with acceleration models
using a phenomenological approach.
In our setup we consider the effects of continuous
time-dependent injection of electrons into the jet with
differing rates, durations, locations and power-law
spectral indices, and evaluate its impact on the ambient
emitting particle spectrum observed at a given snapshot
time. We found that varying the injection parameters has
indeed notable influence on the spectral shapes, which in
turn can be used to set interesting constraints on the
particle injection scenario. We apply our model to the
flare state spectral energy distribution of 3C 454.3 and
PKS 1510-089 to constrain the required injection
parameters. Our results indicate that impulsive-like
particle injection is disfavored here.
With this model we provide a basis for analyzing ambient
electron spectra in terms of injection requirements, with
implications for particle acceleration modes.
| Registration number following "ICRC2015-I/" | 519 |
|---|---|
| Collaboration | -- not specified -- |
Primary author
Anita Reimer
(University of Innsbruck)
Co-author
Mr
Lars Hunger
(University of Freiburg)
