Analytic Light Curves of Gamma‐Ray Burst Afterglows: Homogeneous versus Wind External Media
نویسندگان
چکیده
منابع مشابه
Analytic Light-curves of Gamma-ray Burst Afterglows: Homogeneous versus Wind External Media
Assuming an adiabatic evolution of a Gamma-Ray Burst (GRB) remnant interacting with an external medium, we calculate the injection, cooling, and absorption break frequencies, and the afterglow flux for plausible orderings of the break and observing frequencies. The analytical calculations are restricted to a relativistic remnant and, in the case of collimated ejecta, to the phase where there is...
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GRB afterglow polarization is discussed. We find an observable, up to ∼ 10%, polarization, if the magnetic field coherence length grows at about the speed of light after the field is generated at the shock front. Detection of a polarized afterglow would show that collisionless ultrarelativistic shocks can generate strong large scale magnetic fields and confirm the synchrotron afterglow model. N...
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Due to some refinements in the dynamics, we can follow the overall evolution of a realistic jet numerically till its bulk velocity being as small as βc ∼ 10c. We find no obvious break in the optical light curve during the relativistic phase itself. However, an obvious break does exist at the transition from the relativistic phase to the nonrelativistic phase, which typically occurs at time t ∼ ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2000
ISSN: 0004-637X,1538-4357
DOI: 10.1086/317090