FRONTIERS IN COMPUTATIONAL ASTROPHYSICS

Particle and Flames in Radiative and Magnetic Flows

October 11-15, 2010
Lyon, France

Contribution of Paul Matthew Sutter

Title

Subgrid models of active galactic nuclei in clusters of galaxies

Topics

"Explosive fate of stars"

Keywords

clusters, AGN, subgrid, MHD

Abstract

Feedback processes associated with active galactic nuclei (AGN) found at the centers of clusters of galaxies are a possible source for weak cluster-wide magnetic fields. However, the scales and physics involved in studying these processes necessitate the use of subgrid techniques. We present large-scale simulations of clusters using the 3D adaptive mesh refinement MHD solver in FLASH. We couple this solver to a subgrid model of the accretion onto AGN and the subsequent injection of kinetic, thermal, and magnetic energy. We employ a newly-developed fast and highly parallel halo finder to track the evolution of AGN in a cosmological volume. We study a variety of plausible subgrid models and discuss their impact on accretion rates and cluster magnetic properties.

Talk