Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-30
Astronomy and Astrophysics
Astrophysics
Accepted for publication in: Chin. J. Astron. Astrophys., 15 pages, 8 embedded eps figures
Scientific paper
10.1088/1009-9271/7/3/09
Due to the relativistic motion of gamma-ray burst remnant and its deceleration in the circumburst medium, the equal arrival time surfaces at any moment are not spherical, but should be distorted ellipsoids. This will leave some imprints in the afterglows. In this article, we study the effect of equal arrival time surfaces numerically under various conditions, i.e., for isotropic fireballs, collimated jets, density jump conditions, and energy injection events. For each condition, direct comparison between the two instances when the effect is and is not included, is presented. For isotropic fireballs and jets viewed on axis, the effect slightly hardens the spectra and postpones the peak time of afterglows, but does not change the shapes of the spectra and light curves significantly. In the cases when a density jump or an energy injection is involved, the effect smears the variability of the afterglows markedly.
Cheng Kwong Sang
Huang Yun-Feng
Lu Yi
Wong A. Y. L.
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