Bent it like FRs: extended radio AGN in the COSMOS field and their
  large-scale environment
  One of the fascinating topics in radio astronomy is how to associate the
complexity of observed radio structures to their environment, in order to
understand their interplay and the reason for the plethora of radio structures
found in surveys. In this project, we explore the distortion of the radio
structure of Fanaroff-Riley (FR) type radio sources in the VLA-COSMOS Large
Project at 3 GHz, and relate it to their large-scale environment. We quantify
the distortion by using the angle formed between the jets/lobes of two-sided
FRs, namely bent angle (BA). Our sample includes 108 objects in the redshift
range 0.08 $< z <$ 3, which we cross-correlate to a wide range of large-scale
environments (X-ray galaxy groups, density fields, and cosmic web probes) in
the COSMOS field. The median BA of FRs in COSMOS at $z_{\rm med} \sim$ 0.9 is
167.5$^{+11.5}_{-37.5}$ degrees. We do not find significant correlations
between BA and large-scale environments within COSMOS, covering scales from a
few kpc to several hundred Mpc, nor between BA and host properties. Finally, we
compare our observational data to magnetohydrodynamical (MHD) adaptive-mesh
simulations ENZO-MHD of two FR sources at $z$ = 0.5 and at $z$ = 1. Although
the scatter in BA of the observed data is large, we see an agreement between
observations and simulations in the bent angles of FRs, following a mild
redshift evolution with BA. We conclude that the dominant mechanism affecting
the radio structures of FRs could be the evolution of the ambient medium, where
higher densities and longer depths at lower redshifts allow for more space for
jet interactions.
