Circular Polarization from Gamma-ray Burst Afterglows

Details Circular Polarization from Gamma-ray Burst Afterglows Circular Polarization from Gamma-ray Burst Afterglows

2003-07-26

arxiv.org/abs/astro-ph/0307462v2

Astrophys.J. 595 (2003) L25-L28

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures

Scientific paper

We investigate the circular polarization (CP) from Gamma-Ray Burst (GRB) afterglows. We show that a tangled magnetic field cannot generate CP without an ordered magnetic field because there is always an oppositely directed field, so that no handedness exists. This implies the observation of CP could be a useful probe of an ordered field, which carries valuable information on the GRB central engine. By solving the transfer equation of polarized radiation, we find that the CP reaches 1% at radio frequencies and 0.01% at optical for the forward shock, and 10-1% at radio and 0.1-0.01% at optical for the reverse shock.

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