Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The morphological classification of distant radio galaxies explored with
  three-dimensional simulations   We explore the observational implications of a large systematic study of
high-resolution three dimensional simulations of radio galaxies driven by
supersonic jets. For this fiducial study, we employ non-relativistic
hydrodynamic adiabatic flows from nozzles into a constant pressure-matched
environment. Synchrotron emissivity is approximated via the thermal pressure of
injected material. We find that the morphological classification of a simulated
radio galaxy depends significantly on several factors with increasing distance
(i.e. decreasing observed resolution) and decreasing orientation often causing
re-classification from FR\,II (limb-brightened) to FR\,I (limb-darkened) type.
We introduce the Lobe or Limb Brightening Index (LBI) to measure the radio lobe
type more precisely. The jet density also has an influence as expected with
lower density leading to broader and bridged lobe morphologies as well as
brighter radio jets. Hence, relating observed source type to the intrinsic jet
dynamics is not straightforward. Precession of the jet direction may also be
responsible for wide relaxed sources with lower LBI and FR class as well as for
X-shaped and double-double structures. Helical structures are not generated
because the precession is usually too slow. We conclude that distant radio
galaxies could appear systematically more limb-darkened due to merger-related
re-direction and precession as well as due to the resolution limitation.

15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con