A jet-driven dynamo (JEDD) from jet-inflated bubbles in cooling flows

Noam Soker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


I suggest that the main process that amplifies magnetic fields in cooling flows in clusters and group of galaxies is a jet-driven dynamo (JEDD). The main processes that are behind the JEDD is the turbulence that is formed by the many vortices formed in the inflation processes of bubbles, and the large scale shear formed by the propagating jet. It is sufficient that a strong turbulence exits in the vicinity of the jets and bubbles, just where the shear is large. The typical amplification time of magnetic fields by the JEDD near the jets and bubbles is approximately hundred million years. The amplification time in the entire cooling flow region is somewhat longer. The vortices that create the turbulence are those that also transfer energy from the jets to the intra-cluster medium, by mixing shocked jet gas with the intra-cluster medium gas, and by exciting sound waves. The JEDD model adds magnetic fields to the cyclical behaviour of energy and mass in the jet-feedback mechanism in cooling flows.

Original languageEnglish
Pages (from-to)4776-4779
Number of pages4
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - 1 May 2017
Externally publishedYes


  • Dynamo
  • Galaxies: clusters: intracluster medium
  • Galaxies: jets

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