X-ray mass segregation effect in GCs. IV.

We show that the mass segregation of X-ray sources is quenched in {omega}Cen, while the X-ray source abundance of {omega}Cen is much smaller than other GCs, and the binary hardness ratio (defined as L_X_/L_K_f_b_), with fb being the binary fraction, L_X_ and L_K_ being the cumulative X-ray and K-band luminosity of GCs, respectively) of {omega}Cen is located far below the L_X_/L_K_f_b_)--{sigma}_c_ correlation line of the dynamically normal GCs.

This evidence suggests that the binary burning processes are highly suppressed in {omega}Cen, and other heating mechanisms, very likely a black hole subsystem (BHS), are essential in the dynamical evolution of {omega}Cen. Through the black hole burning processes (i.e., dynamical hardening of the BH binaries), the BHS is dominating the energy production of {omega}Cen, which also makes {omega}Cen a promising factory of gravitational-wave sources in the Galaxy.