Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..312..445l&link_type=abstract
Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference he
Astronomy and Astrophysics
Astronomy
Scientific paper
The energetics of the long duration GRB phenomenon is compared with models of a rotating Black Hole (BH) in a strong magnetic field generated by an accreting torus. The GRB energy emission is attributed to a high magnetic field that breaks down the vacuum around the BH and gives origin to an e± fireball. Its subsequent evolution is hypothesised, in analogy with the in-flight decay of an elementary particle, to evolve in two distinct phases. The first one occurs close to the engine and is responsible of energising and collimating the fireball. The second one consists of a radiation dominated expansion, which correspondingly accelerates the relativistic photon-particle fluid and ends at the transparency time. An anisotropy in the fireball propagation is thus naturally produced, whose degree depends on the bulk Lorentz factor at the end of the collimation phase.
Barbiellini Guido
Celotti Annalisa
Longo Francesco
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