Critical transition to the dead state with whistler suppression. Top panel: Time-averaged turbulent kinetic energies, Reynolds number at the integral scale, and average suppression factor for our 3D runs as a function of α. The values are normalized to those of the unsuppressed run. The leftmost point, corresponding to α = 0, was placed at α = 2 × 10⁻³ for visualization purposes. The three rightmost data points represent decaying runs, thus we do not show error bars. The light gray shaded region indicates the approximate range of the α parameter for typical ICM parameters (see Table 1), while the dark gray shaded region represents the predicted critical α where the transition from MTI turbulence to dead state occurs. Bottom panel: Model for critical α with whistler suppression (see text). The blue band indicates the equipartition value of $\stackrel{\sim }{\beta }$ with the MTI turbulence (Eq. 33). The red band divides the $\alpha -\stackrel{\sim }{\beta }$ space into two regions: where an SSD is possible (below the curve) and where the SSD is not sustainable (hatched region) (see Eq. (36)). The two bands cross approximately at α ≃ 0.038 − 0.046 above which MTI turbulence dies. The gold symbols show the saturated values of $\stackrel{\sim }{\beta }$ for the nondecaying runs.