Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coupling hydrodynamics and radiation calculations for star-jet
  interactions in AGN   Stars and their winds can contribute to the non-thermal (NT) emission in
extragalactic jets. Given the complexity of jet-star interactions, the
properties of the resulting emission are strongly linked to those of the
emitting flows. We simulate the interaction between a stellar wind and a
relativistic extragalactic jet and use the hydrodynamic results to compute the
NT emission under different conditions. We perform relativistic axisymmetric
hydrodynamical simulations of a relativistic jet interacting with a supersonic,
non-relativistic stellar wind. We compute the corresponding streamlines out of
the simulation results, and calculate the injection, evolution, and emission of
NT particles accelerated in the jet shock, focusing on electrons or
$e^\pm$-pairs. Several cases are explored, considering different jet-star
interaction locations, magnetic fields and observer lines of sight. The jet
luminosity and star properties are fixed, but the results are easily scalable
under changes of these parameters. Individual jet-star interactions produce
synchrotron and inverse Compton (IC) emission that peaks from X-rays to MeV
energies (depending on the magnetic field), and at $\sim 100-1000$ GeV
(depending on the stellar type), respectively. The radiation spectrum is hard
in the scenarios explored here due to non-radiative cooling dominance, as
low-energy electrons are efficiently advected even under relatively high
magnetic fields. Interactions of jets with cold stars lead to an even harder IC
spectrum because of the Klein-Nishina effect in the cross-section. Doppler
boosting has a strong impact on the observer luminosity. The emission levels
for individual interactions found here are in the line of previous, more
approximate, estimates, strengthening the hypothesis that collective jet-star
interactions could significantly contribute at high energies under efficient
particle acceleration.

15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th