Covino, Stefano 2009 伽玛暴余辉的偏振

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Title:		GRB Afterglow Polarimetry: Past, Present and Future
Authors:		Covino, Stefano
Publication:		eprint arXiv:0906.5440
Publication Date:		06/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		Proceedings of the conference "The coming of age of X-ray polarimetry", Rome, Italy, 27-30 April 2009
Bibliographic Code:		2009arXiv0906.5440C

Abstract

Gamma-ray bursts and their afterglows are thought to be produced by an ultrarelativistic jet. One of the most important open questions is the outflow composition: the energy may be carried out from the central source either as kinetic energy (of baryons and/or pairs), or in electromagnetic form (Poynting flux). While the total observable flux may be indistinguishable in both cases, its polarization properties are expected to differ markedly. The later time evolution of afterglow polarization is also a powerful diagnostic of the jet geometry. Again, with subtle and hardly detectable differences in the output flux, we have distinct polarization predictions.

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