Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe..44p&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present an analytical approach to the dynamical evolution of fireballs or axially symmetric jets expanding into an external medium, with application to Gamma-Ray Burst remnants. This method leads to numerical calculations of fireball dynamics that are computationally simpler than hydrodynamic simulations. It is also a very flexible approach, that can be easily extended to include more complex situations, such as a continuous injection of energy at the reverse shock, and the sideways expansion in non-spherical ejecta. Numerical results for the dynamic evolution are discussed and compared to the analytical solutions. The light curves computed from beamed ejecta show that, due to the increased swept up matter and the time delay of the large angle emission, the sideways expansion of the remnant gas does not lead to a dimming of the afterglow, and mitigates the subsequent downturn from the transition into the non-relativistic regime.
Meszaros Peter
Panaitescu Alin
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