Mon. Not. R. Astron. Soc., 398, 422-428 (2009/September-1)
Explaining the energetic AGN outburst of MS0735+7421 with massive slow jets.
STERNBERG A. and SOKER N.
Abstract (from CDS):
By conducting axisymmetrical hydrodynamical numerical simulations (2.5 dimensional code) we show that slow, massive, wide jets can reproduce the morphology of the huge X-ray deficient bubble pair in the cluster of galaxies MS0735+7421. The total energy of the jets, composed of the energy in the bubble pair and in the shock wave, is constrained by observations conducted by McNamara et al. to be ∼1062erg. We show that two opposite jets that are active for ∼100Myr, each with a launching half opening angle of α ≃ 70°, an initial velocity of vj∼ 0.1 c and a total mass loss rate of the two jets of, can account for the observed morphology. Rapidly precessing narrow jets can be used instead of wide jets. In our model the cluster suffered from a cooling catastrophe ∼100Myr ago. Most of the mass that cooled, ∼1010M☉, was expelled back to the intracluster medium by the active galactic nuclei activity and is inside the bubbles now, ∼10 per cent formed stars and ∼10 per cent of the cold gas was accreted by the central black hole and was the source of the outburst energy. This type of activity is similar to that expected to occur in galaxy formation.