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arXiv 1305.0809astro-ph.HE
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光学和X射线余辉光变曲线的峰值

Peaks of optical and X-ray afterglow light-curves

A. Panaitescu, W. T. Vestrand, P. Wozniak

摘要:

30个光学余辉和14条X射线光变曲线的峰值通量与峰值出现时间呈现良好的线性关系:光学余辉的F_p ~ t_p^{-2.0},X射线的F_p ~ t_p^{-1.6},峰值出现时间的分布基本一致。我们调查了两个前向冲击模型的余辉光曲线峰值的能力-观察者的位置以外的初始喷流孔径和发病的前向冲击减速-占这些峰值的相关性。对于这两种模型,F_p - t_p关系的斜率只取决于余辉光谱的斜率.我们发现,只有一个圆锥形的喷流看到的光圈,并与风状介质的相互作用,可以解释两个X射线峰关系,给定的平均X射线光谱斜率β_x = 1.0,并为较大的斜率的光学峰关系。然而,关于峰值通量-峰值时期相关性的起源的任何结论充其量是试探性的,因为X射线峰值的当前样本太小而不允许F_p-t_p关系斜率的可靠测量,并且因为多于一个机制和/或一个余辉参数可以驱动该相关性。

英文摘要:

The peaks of 30 optical afterglows and 14 X-ray light-curves display a good anticorrelation of the peak flux with the peak epoch: F_p ~ t_p^{-2.0} in the optical, F_p ~ t_p^{-1.6} in the X-ray, the distributions of the peak epochs being consistent with each other. We investigate the ability of two forward-shock models for afterglow light-curve peaks -- an observer location outside the initial jet aperture and the onset of the forward-shock deceleration -- to account for those peak correlations. For both models, the slope of the F_p - t_p relation depends only on the slope of the afterglow spectrum. We find that only a conical jet seen off-aperture and interacting with a wind-like medium can account for both the X-ray peak relation, given the average X-ray spectral slope beta_x = 1.0, and for the larger slope of the optical peak relation. However, any conclusion about the origin of the peak flux - peak epoch correlation is, at best, tentative, because the current sample of X-ray peaks is too small to allow a reliable measurement of the F_p - t_p relation slope and because more than one mechanism and/or one afterglow parameter may be driving that correlation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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