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arXiv 0903.1184astro-ph.HEastro-ph.CO
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XRF 071031余辉中相关的光学和X射线耀斑

Correlated optical and X-ray flares in the afterglow of XRF 071031

T. Krühler, J. Greiner, S. McBreen, S. Klose, A. Rossi, P. Afonso, C. Clemens, R. Filgas, A. Küpcü Yoldas, G. P. Szokoly, A. Yoldas

摘要:

我们提出了一个密集采样的早期光曲线的光学/近红外(NIR)余辉的X射线闪光(XRF)071031在z=2.692。在爆发后4分钟到7小时之间,在LaSilla上的2.2 m MPI/ESO望远镜上用GROND在g'到K的七个光度带中进行了同时和连续的观测。光变曲线由547个单独的点组成,这使我们能够非常详细地研究与XRF 071031相关的光学瞬态的早期演变。光学/近红外光变曲线主要由亮度的早期增加所支配,这可以归因于前向激波发射的明显开始。有几个颠簸叠加在整体的上升和下降。在雨燕X射线望远镜(XRT)的光变曲线中,从早期到晚期也可以看到显著的耀斑。高质量的宽带数据的可用性使得能够详细研究X射线和光学/近红外余辉之间的联系及其在爆发后第一个夜晚的颜色演变。我们发现的证据光谱硬化的光学波段同时出现的颠簸从一个潜在的余辉组件。光学/近红外光变曲线中的凸起可能与X射线状态中的耀斑有关,表明晚期中央发动机活动是共同的起源。

英文摘要:

We present a densely sampled early light curve of the optical/near-infrared (NIR) afterglow of the X-Ray Flash (XRF) 071031 at z=2.692. Simultaneous and continuous observations in seven photometric bands from g' to K with GROND at the 2.2 m MPI/ESO telescope on LaSilla were performed between 4 minutes and 7 hours after the burst. The light curve consists of 547 individual points which allows us to study the early evolution of the optical transient associated with XRF 071031 in great detail. The optical/NIR light curve is dominated by an early increase in brightness which can be attributed to the apparent onset of the forward shock emission. There are several bumps which are superimposed onto the overall rise and decay. Significant flaring is also visible in the Swift X-Ray Telescope (XRT) light curve from early to late times. The availability of high quality, broadband data enables detailed studies of the connection between the X-ray and optical/NIR afterglow and its colour evolution during the first night post burst. We find evidence of spectral hardening in the optical bands contemporaneous with the emergence of the bumps from an underlying afterglow component. The bumps in the optical/NIR light curve can be associated with flares in the X-ray regime suggesting late central engine activity as the common origin.

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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