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subgrid models of active galactic nuclei in clusters of galaxies

subgrid models of active galactic nuclei in clusters of galaxies. Paul Matthew Sutter Paul M. Ricker Univ. of Illinois at Urbana-Champaign. Frontiers in Computational Astrophysics Lyon, France 10/14/2010. clusters and cosmology. why bother?. next-gen surveys will get ~10,000 clusters

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subgrid models of active galactic nuclei in clusters of galaxies

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  1. subgrid modelsofactive galactic nucleiinclusters of galaxies Paul Matthew Sutter Paul M. Ricker Univ. of Illinois at Urbana-Champaign Frontiers in Computational Astrophysics Lyon, France 10/14/2010

  2. clusters and cosmology

  3. why bother? • next-gen surveys will get ~10,000 clusters • significance will be reduced by systematics • must understand cluster astrophysics to constrain these systematics • magnetic fields play large role in cluster physics, but are poorly understood... • DES • 500 Megapixel camera at Blanco 4-meter telescope • 5000 square-degree survey

  4. radio halos Abell 2163 1.4Ghz Radio Contours (GMRT, India) and ROSAT X-ray emission (Feretti et al. 2001)

  5. radio mini-halos Perseus Cluster (Fabian et al. 2000) (Burns et al. 1992, Sibring 1993)

  6. radio relics Abell 2163 1.4Ghz Radio Contours (GMRT, India) and ROSAT X-ray emission (Bagchi et al. 2006)

  7. seeding magnetic fields

  8. agn

  9. jet injection Cattaneo & Teyssier (2007) • jet energy linked to accretion rate • assume entrainment factor • cylindrical feedback region • kinetic, thermal, and mass injection • jets point along axis

  10. magnetic field injection Li et al. (2006) • appropriate for jets and bubbles • poloidal and toroidal components • assumes underlying dynamo-like system • free to choose scale radius, magnetic field strength

  11. FLASH (Fryxell et al. 2000) • oct-tree adaptive mesh refinement • Gravity: N-body particle-mesh multigrid+pFFT • Hydro: PPM • MHD: Constrained-Transport SM • sutherland & dopitaradiative cooling • fast on-the-fly halo finding • scales well to >200,000 processors

  12. test setup • mock 1014Mʘ halo • fixed NFW potential (rs = 165 kpc) • rcool core = 40kpc • tcool ~ 6 Gyr • Mbh = 107Mʘ • ~0.5 kpc resolution

  13. injected magnetic field

  14. accretion rate

  15. magnetized cluster

  16. preliminary conclusions

  17. outro • clusters offer unique window on universe • must understand astrophysics to understand cosmology • magnetic fields impact cluster physics • simulations can help us understand magnetic fields

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