Inflating fat bubbles in clusters of galaxies by precessing massive slow jets

Assaf Sternberg*, Noam Soker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


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 ≤ θmax ∼ 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 vj ∼ 104 km s-1, 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.

Original languageEnglish
Pages (from-to)1327-1336
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Mar 2008
Externally publishedYes


  • Cooling flows
  • Galaxies: jets
  • Hydrodynamics

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