An interesting case of the formation and evolution of a barred galaxy in
  the cosmological context
  Elongated, bar-like galaxies without a significant disk component, with
little rotation support and no gas, often form as a result of tidal
interactions with a galaxy cluster, as was recently demonstrated using the
IllustrisTNG-100 simulation. Galaxies that exhibit similar properties are,
however, also found to be infalling into the cluster for the first time. We use
the same simulation to study in detail the history of such a galaxy over cosmic
time in order to determine its origin. The bar appears to be triggered at t=6.8
Gyr by the combined effect of the last significant merger with a subhalo and
the first passage of another dwarf satellite, both ten times less massive than
the galaxy. The satellites deposit all their gas in the galaxy, contributing to
its third and last star-formation episode, which perturbs the disk and may also
contribute to the formation of the bar. The galaxy then starts to lose its gas
and dark matter due to its passage near a group of more massive galaxies. The
strongest interaction involves a galaxy 22 times more massive, leaving the
barred galaxy with no gas and half of its maximum dark matter mass. During this
time, the bar grows steadily, seemingly unaffected by the interactions,
although they may have aided its growth by stripping the gas. The studied
galaxy, together with two other similar objects briefly discussed in this
letter, suggest the existence of a new class of early-type barred galaxies and
thereby demonstrate the importance of interactions in galaxy formation and
evolution.
