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09 February 2025
 
  » arxiv » astro-ph/0112083

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Afterglow lightcurves, viewing angle and the jet structure of gamma-ray bursts
E. Rossi ; D. Lazzati ; M. J. Rees ;
Date 4 Dec 2001
Journal Mon.Not.Roy.Astron.Soc. 332 (2002) 945
Subject astro-ph
AffiliationIoA, Cambridge
AbstractGamma ray bursts are often modelled as jet-like outflows directed towards the observer; the cone angle of the jet is then commonly inferred from the time at which there is a steepening in the power-law decay of the afterglow. We consider an alternative model in which the jet has a beam pattern where the luminosity per unit solid angle (and perhaps also the initial Lorentz factor) decreases smoothly away from the axis, rather than having a well-defined cone angle within which the flow is uniform. We show that the break in the afterglow light curve then occurs at a time that depends on the viewing angle. Instead of implying a range of intrinsically different jets - some very narrow, and others with similar power spread over a wider cone - the data on afterglow breaks could be consistent with a standardized jet, viewed from different angles. We discuss the implication of this model for the luminosity function.
Source arXiv, astro-ph/0112083
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