Description:Galaxy Formation at High-redshift: Quantifying Black Holes’ feedback on the evolution of the visible Universe
Abstract:The most recent galaxy surveys conducted within projects like the SDSS, FUSE, GALEX, SPITZER, have brought up a convincing evidence concerning the importance of feedback from relativistic jets, produced by Black Holes buried within the bulges of galaxies, on the global evolution of the galaxies themselves. The energy released from the jet can either suppress or enhance stellar formation in the immediate neighbours of the bulge and in the more distant regions, thus modifying the observable properties of Elliptical galaxies at z ~ 0-3. We have a qualitative evidence of this feedback from the rapid metal enrichment of massive ellipticals at z ~ 2, but simple analytical models are unable to provide a quantitative understanding of this feedback. Numerical simulations are then needed, in order to provide the physical framework to allow quantitative predictions of the evolution of the galaxy population.
The Cosmology & Computational Astrophysics group at INAF-OA Catania (V.
Antonuccio, U. Becciani) has recently started a collaboration with the Dept. of Physics, University of Oxford, to undertake this task. The high performance simulations involve the exploitation of a recently developed interface between block-structured collisionless and Adaptive Mesh Refinement codes, which allow to perform simulations of structure formation where the highly inhomogeneous Large Scale Structure can be reliably tracked with a user-chosen level of refinement. These are the most advanced simulation techniques, as they are able to include in the most efficient way the collisional component (gas) within the adaptive mesh refinement part of the code and the collisionless components (dark matter and stars), and to include, at the same time, star formation and feedbacks.
The initial simulations were performed on the INAF-OA Catania cluster, using 52 PE’s (first results available at http://web.ct.astro.it/cosmoct/web_group/research3/research3_jet.html).
These initial 2D simulations already show the importance of using adaptive refinement t