Evolution of the polarization of the optical afterglow of the γ-ray burst GRB030329
Evolution of the polarization of the optical afterglow of the γ-ray burst GRB030329
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DOI：
10.1038/nature02077
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发表时间：
2003-11
期刊：
影响因子：
64.8
通讯作者：
J. Greiner;S. Klose;K. Reinsch;H. Schmid;R. Sari;D. Hartmann;C. Kouveliotou;A. Rau;E. Palazzi-E.-P
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文献类型：
--
作者：
J. Greiner;S. Klose;K. Reinsch;H. Schmid;R. Sari;D. Hartmann;C. Kouveliotou;A. Rau;E. Palazzi-E.-P
超新星与 GRB030329 的关联有力地支持了 γ 射线爆发的“塌陷星”模型，即在祖星塌陷后形成相对论性喷流。这种喷流无法在空间上分辨，因为 γ 射线爆发位于宇宙学距离处。相反，它们的存在是根据余辉光变曲线的“断裂”以及理论上希望通过提出大部分以窄光束形式出现来减少爆发的估计总能量来推断的。余辉偏振的时间演化，可能为相对论性流出的喷流结构提供独立证据。小水平极化（∼1-3%）,,,,,,,,,已经报道了几次爆发，但其时间演化尚未确定。在这里，我们报告了 GRB030329 余辉的偏振观测。我们建立了偏振光曲线，检测百分比水平的持续偏振，并发现显着的变化。数据表明，余辉磁场具有较小的相干长度，并且大部分是随机的，可能是由湍流产生的，这与 GRB021206 瞬发 γ 射线中检测到的高偏振所产生的图像形成鲜明对比（参考文献 1）。
The association of a supernova with GRB030329,strongly supports the ‘collapsar’ model of γ-ray bursts, where a relativistic jet forms after the progenitor star collapses. Such jets cannot be spatially resolved because γ-ray bursts lie at cosmological distances; their existence is instead inferred from ‘breaks’ in the light curves of the afterglows, and from the theoretical desire to reduce the estimated total energy of the burst by proposing that most of it comes out in narrow beams. Temporal evolution of the polarization of the afterglows,,may provide independent evidence for the jet structure of the relativistic outflow. Small-level polarization (∼1–3 per cent),,,,,,,,,has been reported for a few bursts, but its temporal evolution has yet to be established. Here we report polarimetric observations of the afterglow of GRB030329. We establish the polarization light curve, detect sustained polarization at the per cent level, and find significant variability. The data imply that the afterglow magnetic field has a small coherence length and is mostly random, probably generated by turbulence, in contrast with the picture arising from the high polarization detected in the prompt γ-rays from GRB021206 (ref. ).