Two-component jet models of gamma-ray burst sources

Peng, F. and Königl, A. and Granot, J. (2005) Two-component jet models of gamma-ray burst sources. Il nuovo cimento C, 28 (3). pp. 439-442. ISSN 1826-9885

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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, highly relativistic outflow, from which the γ-ray emission originates, and a wider, moderately relativistic 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 scheme to the interpretation of the afterglow lightcurves in GRB and X-ray flash sources and show that it may significantly alleviate the radiative efficiency requirements in the internal shock model of GRBs.

Item Type: Article
Additional Information: Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004.
Uncontrolled Keywords: γ-ray sources; γ-ray bursts ; Jets, outflows, and bipolar flows ; Radiation mechanisms; polarization
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 16 Mar 2020 10:56
Last Modified: 16 Mar 2020 10:56

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