Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003tsra.symp...53f&link_type=abstract
TEXAS IN TUSCANY. Proceedings of the XXI Symposium on Relativistic Astrophysics. Held 9-13 December 2002 in Florence, Italy. Edi
Astronomy and Astrophysics
Astrophysics
First Stars, Initial Mass Function
Scientific paper
The appearance of the first stars when the universe was only 100 Myr old marked the Cosmic Dawn and the occurrence of a number of physical effects (cosmic reionization, intergalactic medium metal enrichment, black hole formation, magnetic field cosmogenesis and - obviously - galaxy formation) which are now entering the realm of the observability and are strongly governed by so-called 'feedback effects'. These feedback effects due to massive stars and supernovae in the first objects are shown to regulate both galaxy formation/evolution and the reionization process. They are particularly relevant as it is believed that the Initial Mass Function of the first stars was very heavy, thus favoring the formation of massive objects which end their lives as supernovae, or most likely, in even more gigantic explosions which could be connected with high energy events as gamma ray bursts and TeV-neutrino emission until a metallicity-driven transition to a normal star formation mode occurred. I will review the physical basis for this scenario.
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