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首页> 外文期刊>The Astrophysical journal >REVEALING THE JET STRUCTURE OF GRB 030329 WITH HIGH-RESOLUTION MULTICOLOR PHOTOMETRY
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REVEALING THE JET STRUCTURE OF GRB 030329 WITH HIGH-RESOLUTION MULTICOLOR PHOTOMETRY

机译：高分辨率多色光度法揭示GRB 030329的射流结构

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摘要

We present multicolor optical observations of the nearby (z = 0.1685) gamma-ray burst GRB 030329 obtained with the same instrumentation over a time period of 6 hours, for a total of an unprecedented 475 quasi-simultaneous BVR observations. The achromatic steepening in the optical, which occurs at t ～ 0.7 days, provides evidence for a dynamic transition of the source and can be most readily explained by models in which the GRB ejecta are collimated into a jet. Since the current state-of-the-art modeling of GRB jets is still fraught with uncertainties, we use these data to critically assess some classes of models that have been proposed in the literature. The data, especially the smooth decline rate seen in the optical afterglow, are consistent with a model in which GRB 030329 was a homogeneous, sharp-edged jet, viewed near its edge interacting with a uniform external medium or viewed near its symmetry axis with a stratified wind-like external environment. The lack of short-timescale fluctuations in the optical afterglow flux down to the 0.5% level puts stringent constraints on possible small-scale angular inhomogeneities within the jet or fluctuations in the external density.
机译：我们提供了在6个小时的时间内用相同的仪器获得的附近（z = 0.1685）伽马射线暴GRB 030329的多色光学观测，总共进行了475次空前的准同时BVR观测。光学消色差的陡峭发生在t〜0.7天，为光源的动态过渡提供了证据，并且可以通过将GRB射流准直成射流的模型来最容易地解释。由于当前GRB喷气机的最新建模仍充满不确定性，因此我们使用这些数据来严格评估文献中提出的某些类型的模型。数据，特别是在光学余辉中看到的平滑下降率，与模型一致，在模型中GRB 030329是均匀，锋利的射流，在其边缘与均匀的外部介质相互作用时观察，或者在其对称轴附近以分层的类似风的外部环境。光学余辉通量不足0.5％的短时尺度波动缺乏，对射流内可能的小尺度角度不均匀性或外部密度波动提出了严格的限制。

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