[Todos] IAFE-COLOQUIOS: "¿Qué se investiga en el IAFE?: THE RE-IONIZATION OF THE UNIVERSE

["Area Difusión IAFE"]

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                        PROXIMO COLOQUIO DEL IAFE
                  Instituto de Astronomía y Física del Espacio
                            CONICET-UBA

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                       ¿Qué se investiga en el IAFE?:
                        THE RE-IONIZATION OF THE UNIVERSE

                        MIERCOLES 26 de marzo de 2014 a las 14hs

                        I.F. Mirabel, V. Douna & L. Pellizza
                                 IAFE-CONICET

                               Aula del Edificio IAFE

The re-ionization of the universe that took place during the first
billon years after the Big Bang is one

of the major frontiers in cosmology. Until recently, most models of the
re-ionization had considered

the ultraviolet radiation from the first generations of massive stars
as the only important factor in the

process of re-ionization of the intergalactic medium. It will be shown
that besides the UV radiation

of massive stars, feedback from the fossils of those massive stars
(X-rays and relativistic jets from

i.e. accreting stellar black holes and neutron stars), played an
important role determining the early

thermal history of the universe and partially ionizing the
intergalactic medium over large volumes of

space. Feedback from accreting black holes and neutron stars had a
direct impact on the properties

of the faintest galaxies at high redshifts, the smallest dwarf galaxies
in the local universe, and in the

solution of a basic problem in the cold dark matter model of the
universe.