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arXiv 0806.4270astro-ph
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GRB 050401余辉的光学观测:一个双喷流模型的例子

Optical Observations of GRB 050401 Afterglow : A case for Double Jet Model

Atish Kamble, Kuntal Misra, D. Bhattacharya, Ram Sagar

摘要:

GRB 050401的余辉呈现出几个新颖而有趣的特征:[1]最初在光学波段的衰减比X射线快。[2]$\sim$ 0.06天后X射线光变曲线出现断裂,断裂后斜率异常。[3]X射线余辉没有表现出任何光谱的演变,而R波段的光变曲线没有表现出任何中断。我们已经模拟了所观察到的GRB 050401的余辉的多波段演化起源于一个两个组件的射流,解释在X射线光变曲线的中断,由于横向扩展的一个狭窄的准直流出,占主导地位的X射线发射。光发射归因于更宽的射流分量。我们的模型再现了GRB 050401多波段余辉的所有观测特征。我们目前的光学观测伽玛暴050401使用104厘米Sampurnanand望远镜在ARIES,奈尼塔尔。多波段数据的分析结果,并与GRB 030329,双喷流的第一个报告的情况下进行了比较。

英文摘要:

The afterglow of GRB 050401 presents several novel and interesting features : [1] An initially faster decay in optical band than in X-rays. [2] A break in the X-ray light curve after $\sim$ 0.06 day with an unusual slope after the break. [3] The X-ray afterglow does not show any spectral evolution across the break while the R band light curve does not show any break. We have modeled the observed multi-band evolution of the afterglow of GRB 050401 as originating in a two component jet, interpreting the break in X-ray light curve as due to lateral expansion of a narrow collimated outflow which dominates the X-ray emission. The optical emission is attributed to a wider jet component. Our model reproduces all the observed features of multi-band afterglow of GRB 050401. We present optical observations of GRB 050401 using the 104-cm Sampurnanand Telescope at ARIES, Nainital. Results of the analysis of multi-band data are presented and compared with GRB 030329, the first reported case of double jet.

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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