2006/11/16 by Pierluigi Monaco, Monaco, Pierluigi
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0611532
6 pages, figures included. To appear in the ASP Conference Series (proceedings of the "Cosmic Frontiers" conference held in Durham, 31st July - 4th August 2006)
arxiv created 2006/11/16 · arxiv updated 2009/12/01
We present some results of the new MORGANA model for the rise of galaxies and active nuclei, and show that the improved physical motivation of the description of star formation and feedback allows to get hints on the physical processes at play. We propose that the high level of turbulence in star-forming bulges is at the base of the observed downsizing of AGNs. In this framework it is also possible to reproduce the recently obtained evidence that most low-redshift accretion is powered by relatively massive, slowly accreting black holes. Besides, we notice that many galaxy formation models (including MORGANA) fail to reproduce a basic observable, namely the number density of 1011 Msun galaxies at z~1, as traced by the GOODS-MUSIC sample. This points to a possibly missing ingredient in the modeling of stellar feedback.