Koers 2007 富中子喷流的高能辐射

主要内容:
在inelastic neutron - proton collisions 中，可能产生2 - 20 GeV的辐射，而将来被GLAST 的LAT 观测到。

精彩摘抄:


文章信息:
Neutron-rich gamma-ray burst flows: dynamics and particle creation in neutron - proton collisions

Authors: Hylke B. J. Koers, Dimitrios Giannios

(Submitted on 28 Mar 2007)

Abstract: 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.

Comments:

13 pages, 5 figures, submitted to A&A

Subjects:

Astrophysics (astro-ph)

Report number:

NIKHEF-2007-003

Cite as:

arXiv:astro-ph/0703719v1