Previously we demonstrated that collisions between clumps of gas in the
circumnuclear disc can reduce
their angular momentum and set some of the clumps on a plunging
trajectory towards the supermassive
black hole. If the central luminosity is determined by the gas accretion
mechanism, then there exists a
certain range of accretion rate and efficiency that allow the thermal
instability to sustain the mass inflow through the two-temperature
medium. Here we explore the stellar component of the nuclear star
cluster which acts as an additional source of heating and contributes an
additional energy input into the gaseous environment in the Galactic
centre Minispiral region.