[Todos] Rectificaciion hora!! 17 hs - IAFE: Coloquio: "BLACK HOLES AT THE DAWN OF THE UNIVERSE: COSMOLOGICAL IMPLICATIONS"]]

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>
>
>                     COLOQUIO EN EL IAFE
>                Instituto de Astronomía y Física del Espacio
>                     2010 - 40 aniversario IAFE
>                          CONICET-UBA
>  _______________________________________________________________
> "BLACK HOLES AT THE DAWN OF THE UNIVERSE: COSMOLOGICAL IMPLICATIONS"
>                        Dr. Félix Mirabel
>                  Instituto de Astronomía y Física del Espacio
>                            (CONICET-UBA)
>                 Miercoles 15 de diciembre 2010, 17:00 HS
>                          Aula del Edificio IAFE
>
>
> Abstract:
> The so called "dark ages" of the universe began about 400.000 years after
> the Big Bang as matter cooled down and space became filled with neutral
> hydrogen for hundreds of millions years. How the universe was heated and
> reionized during the first billon years after the Big Bang is a question
> of topical interest in cosmology. I will show that current theoretical
> models on the formation and collapse of primordial stars suggest that a
> large fraction of massive stars should have imploded, forming high mass
> black hole x-ray binaries. Then, I will review the recent observations of
> compact stellar remnants in the near and distant universe that support
> this theoretical expectation, showing that the thermal (UV and soft
> x-rays) and non-thermal (hard x-rays, winds and jets) emission from a
> large population of stellar black holes in high mass binaries heated the
> intergalactic medium over large volumes of space, complementing the
> reionization by their stellar progenitors. Feedback from accreting stellar
> black holes at that epoch would have prevented the formation of the large
> quantities of low mass dwarf galaxies that are predicted by the cold dark
> matter model of the universe. A large population of black hole binaries
> may be important for future observations of gravitational waves as well as
> for the existing and future atomic hydrogen radio surveys of HI in the
> early universe.
>
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>
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-- 
Susana Pedrosa
Numerical Astrophysics Group
Institute for Astronomy and Space Physics - IAFE
CC67 - Suc 28 (1428) - Buenos Aires - Argentina
Tel: (+54-11) 4789-0179 (ext. 140)
Fax: (+54-11) 4786-8114