  The collective effect of emission by the forward moving partons of high
energy Cherenkov gluons in nucleus-nucleus collisions at RHIC and LHC energies
is considered. It can reveal itself as peaks in the pseudorapidity distribution
of jets at midrapidities or as a ring-like structure of individual events in
event-by-event analysis. The pseudorapidity distribution of centers of dense
isolated groups of particles in HIJING model is determined. It can be
considered as the background for Cherenkov gluons. If peaks above this
background were found in experiment, they would indicate new collective
effects.
