The moderate cooling flow model and feedback in galaxy formation

Noam Soker*, Assaf Sternberg, Fabio Pizzolato

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations


For the recent four years we have been studying feedback heating in cooling flow (CF) clusters by AGN activity that inflates bubbles by jets; this short contribution to a meeting summarizes our main results. To achieve our results we had to self-consistently inflate the bubbles with jets, rather than inject them artificially. Our main results are as follows (1) Feedback mechanisms that are based on Bondi accretion fail. Instead, the accretion to the central super-massive black hole (SMBH) is in the form of cold dense blobs that fall-in from an extended region. (2) Slow massive wide (SMW) jets, or rapidly precessing jets, can inflate bubbles similar to those observed in CF clusters. (3) Contrary to some claims in the literature, the inflated bubbles are stable for a relatively long time, becoming unstable only at later times. (4) A single bubble inflation episode excites multiple sound waves and shocks. These can then heat the intracluster medium (ICM). (5) Mixing of the bubble material to the ICM is efficient, and can serve as a main heating channel. (6) The heating processes work in all directions, and can explain the heating of the ICM in CF in clusters and in galaxies.

Original languageEnglish
Title of host publicationMonster's Fiery Breath
Subtitle of host publicationFeedback in Galaxies, Groups, and Clusters - Proceedings of the International Conference
Number of pages5
StatePublished - 2009
Externally publishedYes
EventInternational Conference on Monster's Fiery Breath: Feedback in Galaxies, Groups, and Clusters - Madison, WI, United States
Duration: 1 Jun 20095 Jun 2009

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


ConferenceInternational Conference on Monster's Fiery Breath: Feedback in Galaxies, Groups, and Clusters
CountryUnited States
CityMadison, WI


  • Cooling flows
  • Galaxies: active
  • Galaxies: clusters: general
  • ISM: jets and outflows

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