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Polarized Emission from Gamma-Ray Burst Jets

Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK
Galaxies 2017, 5(4), 80; https://doi.org/10.3390/galaxies5040080
Received: 18 September 2017 / Revised: 4 November 2017 / Accepted: 14 November 2017 / Published: 17 November 2017
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
I review how polarization signals have been discussed in the research field of Gamma-Ray Bursts (GRBs). I mainly discuss two subjects in which polarimetry enables us to study the nature of relativistic jets. (1) Jet breaks: Gamma-ray bursts are produced in ultra-relativistic jets. Due to the relativistic beaming effect, the emission can be modeled in a spherical model at early times. However, as the jet gradually slows down, we begin to see the edge of the jet together with polarized signals at some point. (2) Optical flash: later time afterglow is known to be insensitive to the properties of the original ejecta from the GRB central engine. However, a short-lived, reverse shock emission would enable us to study the nature of of GRB jets. I also briefly discuss the recent detection of optical circular polarization in GRB afterglow. View Full-Text
Keywords: polarization; relativistic jets; relativistic shocks; gamma-ray bursts polarization; relativistic jets; relativistic shocks; gamma-ray bursts
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Kobayashi, S. Polarized Emission from Gamma-Ray Burst Jets. Galaxies 2017, 5, 80.

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