Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-15
Astrophys.J. 626 (2005) 966-977
Astronomy and Astrophysics
Astrophysics
13 pages, 3 figures, scheduled to be published in ApJ, 20 June 2005, Vol 626
Scientific paper
10.1393/ncc/i2005-10078-4
Recent observational and theoretical studies have raised the possibility that the collimated outflows in gamma-ray burst (GRB) sources have two distinct components: a narrow (opening half-angle $\theta_{\rm n}$), highly relativistic (initial Lorentz factor $\eta_\rmn \gtrsim 10^2$) outflow, from which the $\gamma$-ray emission originates, and a wider ($\theta_{\rm w} \lesssim 3 \theta_{\rm n}$), moderately relativistic ($\eta_{\rm w}\sim 10$) surrounding flow. Using a simple synchrotron emission model, we calculate the R-band afterglow lightcurves expected in this scenario and derive algebraic expressions for the flux ratios of the emission from the two jet components at the main transition times in the lightcurve. We apply this model to GRB sources, for explaining the structure of afterglows and source energetics, as well as to X-ray flash sources, which we interpret as GRB jets viewed at an angle $\theta_{\rm obs} > \theta_{\rm n}$. Finally, we argue that a neutron-rich hydromagnetic outflow may naturally give rise to repeated brightening episodes in the afterglow lightcurve as observed in GRB 021004 and GRB 030329.
Granot Jonathan
Konigl Arieh
Peng Fang
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