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Title: LEAVING THE DARK AGES WITH AMIGA

We present an Analytic Model of Intergalactic-medium and GAlaxy (AMIGA) evolution since the dark ages. AMIGA is in the spirit of the popular semi-analytic models of galaxy formation, although it does not use halo merger trees but interpolates halo properties in grids that are progressively built. This strategy is less memory-demanding and allows one to start modeling at sufficiently high redshifts and low halo masses to have trivial boundary conditions. The number of free parameters is minimized by making a causal connection between physical processes usually treated as independent of each other, which leads to more reliable predictions. However, the strongest points of AMIGA are the following: (1) the inclusion of molecular cooling and metal-poor, population III (Pop III) stars with the most dramatic feedback and (2) accurate follow up of the temperature and volume filling factor of neutral, singly ionized, and doubly ionized regions, taking into account the distinct halo mass functions in those environments. We find the following general results. Massive Pop III stars determine the intergalactic medium metallicity and temperature, and the growth of spheroids and disks is self-regulated by that of massive black holes (MBHs) developed from the remnants of those stars. However, the properties ofmore » normal galaxies and active galactic nuclei appear to be quite insensitive to Pop III star properties due to the much higher yield of ordinary stars compared to Pop III stars and the dramatic growth of MBHs when normal galaxies begin to develop, which cause the memory loss of the initial conditions.« less
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Institut de Ciències del Cosmos, Universitat de Barcelona, UB-IEEC, Martí i Franquès 1, E-08028 Barcelona (Spain)
  2. European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei Mnchen (Germany)
  3. Centro de Radioastronomía y Astrofísica, UNAM, Campus Morella (Mexico)
  4. Centro de Investigaciones de Astronomía, Apartado Postal 264, Mérida 5101-A (Venezuela, Bolivarian Republic of)
Publication Date:
OSTI Identifier:
22340110
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 216; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANALYTIC FUNCTIONS; BLACK HOLES; BOUNDARY CONDITIONS; GALACTIC EVOLUTION; GALAXIES; GALAXY NUCLEI; MASS; METALLICITY; NONLUMINOUS MATTER; RED SHIFT; SIMULATION; SPHEROIDS; STARS