  An ensemble of nonlocally coupled excitable FitzHugh-Nagumo systems is
studied. In the presence of noise the explored system can exhibit a special
kind of chimera states called coherence-resonance chimera. As previously
thought, noise plays principal role in forming these structures. It is shown in
the present paper that these regimes appear because of the specific coupling
between the elements. The action of coupling involve a spatial wave regime,
which occurs in ensemble of excitable nodes even if the noise is switched off.
In addition, a new chimera state is obtained in an excitable regime. It is
shown that the noise makes this chimera more stable near an Andronov-Hopf
bifurcation.
