  We identify the mechanism behind the existence of intensity induced chimera
states in globally coupled oscillators. We find that the effect of intensity in
the system is to cause multistability by increasing the number of fixed points.
This in turn increases the number of multistable attractors and we find that
their stability is determined by the strength of coupling . This causes the
coexistence of different collective states in the system depending upon the
initial state. We demonstrate that intensity induced chimera is generic to both
periodic and chaotic systems. We have discussed possible applications of our
results to real world systems like the brain and spin torque nano oscillators.
