2008MNRAS.384.1327S

We conduct hydrodynamical numerical simulations and find that precessing massive slow jets can inflate fat bubbles, that is, more- or less-spherical bubbles, that are attached to the centre of clusters of galaxies. To inflate a fat bubble, the jet should precess fast. The precessing angle θ should be large, or change over a large range 0 ≤ θ ≤ θ_max∼ 30°-70° (depending also on other parameters), where θ = 0° is the symmetry axis. The constraints on the velocity and mass-outflow rate are similar to those on wide jets to inflate fat bubbles. The velocity should be v_j ∼ 10⁴km/s, and the mass-loss rate of the two jets should be. These results, and our results from a previous paper dealing with slow wide jets, support the claim that a large fraction of the feedback heating in cooling flow clusters and in the processes of galaxy formation is done by slow massive jets.