Self-regulation of active galactic nuclei in galaxy clusters

Marcus Brüggen, Evan Scannapieco

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Cool cores of galaxy clusters are thought to be heated by low-power active galactic nuclei (AGN), whose accretion is regulated by feedback. However, the interaction between the hot gas ejected by the AGN and the ambient intracluster medium is extremely difficult to simulate as it involves a wide range of spatial scales and gas that is Rayleigh-Taylor (RT) unstable. Here, we present a series of three-dimensional hydrodynamical simulations of a self-regulating AGN in a galaxy cluster. Our adaptive-mesh simulations include prescriptions for radiative cooling, AGN heating and a subgrid model for RT-driven turbulence, which is crucial to simulate this evolution. AGN heating is taken to be proportional to the rest-mass energy that is accreted on to the central region of the cluster. For a wide range of feedback efficiencies, the cluster regulates itself for at least several 109 yr. Heating balances cooling through a string of outbursts with typical recurrence times of around 80 Myr, a time-scale that depends only on global cluster properties. Under certain conditions, we find central dips in the metallicity of the intracluster medium. Provided the subgrid model used here captures all its key properties, turbulence plays an essential role in the AGN self-regulation in cluster cores.

Original languageEnglish (US)
Pages (from-to)548-560
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume398
Issue number2
DOIs
StatePublished - Sep 2009

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active galactic nuclei
galaxies
heating
turbulence
cooling
gas
outburst
simulation
dip
accretion
timescale
automatic control
high temperature gases
metallicity
energy
regulation
mesh
strings
gases
interactions

Keywords

  • Cooling flows
  • Hydrodynamics
  • X-rays: galaxies: clusters

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Self-regulation of active galactic nuclei in galaxy clusters. / Brüggen, Marcus; Scannapieco, Evan.

In: Monthly Notices of the Royal Astronomical Society, Vol. 398, No. 2, 09.2009, p. 548-560.

Research output: Contribution to journalArticle

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