Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-28
Astron.Astrophys.471:395-408,2007
Astronomy and Astrophysics
Astrophysics
15 pages, 6 figures, accepted for publication by A&A. Minor revisions: added references and one extra figure
Scientific paper
10.1051/0004-6361:20077560
We consider gamma-ray burst outflows with a substantial neutron component that are either dominated by thermal energy (fireballs) or by magnetic energy. In the latter case, we focus on the recently introduced `AC' model which relies on magnetic reconnection to accelerate the flow and power the prompt emission. For both the fireball and the AC model, we investigate the dynamical importance of neutrons on the outflow. We study particle creation in inelastic neutron - proton collisions and find that in both models the resulting neutrino emission is too weak to be detectable. The inelastic collisions also produce gamma-rays, which create pairs in interactions with soft photons carried with the flow. In magnetically driven outflows, the energy of these pairs is radiated away as synchrotron emission. The bulk of the emission takes place at a few hundred keV, which makes it difficult to disentangle this signal from the prompt emission. In fireballs, however, pair cascading leads to the emission of gamma-rays with observer energy in the range of 2 - 20 GeV and a fluence well above the GLAST threshold. Therefore this emission can be a useful diagnostic of the nature of the outflow.
Giannios Dimitrios
Koers Hylke B. J.
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