The synchrotron polarization in decaying magnetic field in gamma-ray bursts
نویسندگان
چکیده
منابع مشابه
Linear Polarization in Gamma-ray Bursts: the Case for an Ordered Magnetic Field
Linear polarization at the level of ∼ 1 − 3% has by now been measured in several GRB afterglows. Whereas the degree of polarization, P, was found to vary in some sources, the position angle, θp, was roughly constant in all cases. Until now, the polarization has been commonly attributed to synchrotron radiation from a jet with a tangled magnetic field that is viewed somewhat off axis. However, t...
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The degree and the temporal evolution of linear polarization in the prompt and afterglow emission of gamma-ray bursts is a very robust diagnostic of some key features of gamma-ray bursts jets and their micro and macro physics. In this contribution, I review the current status of the theory of polarized emission from GRB jets during the prompt, optical flash, and afterglow emission. I compare th...
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In models for gamma ray burst afterglows, it is normally assumed that the external shock strongly amplifies the magnetic field and that this field maintains a steady value throughout the shocked region. We discuss the effects of modifying this (probably simplistic) assumption. The observations are incompatible with a post-shock field that decays too rapidly. However if the field pervaded only a...
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The polarization of the prompt γ-ray emission has been measured in four bright gamma ray bursts (GRBs). It was nearly maximal in all cases, as predicted by the Cannonball (CB) model of GRBs long before the observations. These results are inconsistent with standard models of GRBs wherein the prompt emission is due to synchrotron radiation. A much smaller linear polarization is predicted by the C...
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The origin and structure of magnetic fields in Gamma-Ray Burst (GRB) fireball plasmas are two of the most important open questions in all GRB models. Recent measurements of γ−ray polarization were claimed to suggest the presence of a uniform field originating in the compact object driving the outflow. This interpretation is, however, controversial, since a high degree of linear polarization is ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2020
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/staa2595