期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 349, 期 1, 页码 31-38出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.07475.x
关键词
radiation mechanisms : non-thermal; shock waves; gamma-rays : bursts; X-rays : general
Extensive X-ray, optical and radio observations of the bright afterglow of the gamma-ray burst GRB 030329 are used to construct the multifrequency evolution the event. The data are fitted using the standard fireball shock model to provide estimates of the initial energy, epsilon = 6.8 x 10(52) erg sr(-1), the density of the ambient medium, n(0) = 1 cm(-3), the electron and magnetic energy density fractions, epsilon(e) = 0.24 and epsilon(B) = 0.0017, the power-law index of the relativistic electron spectrum, p = 2.25, and the opening angle of the jet, theta(j) = 3degrees. Deviations from the standard model seen in the optical and radio are most likely attributable to the concurrent hypernova SN2003dh. Peaks at 0.23 and 1.7 d in the R-band are much brighter than expected from a standard supernova (SN), and there is a large radio excess over the expected afterglow flux for t > 2 d. No deviation from the best-fitting afterglow model is seen in the X-ray decline, indicating that the excess optical and radio flux from 1-5 d arises from a later injection of slower electrons by the central engine.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据