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arXiv 0904.1797astro-ph.HEastro-ph.CO
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GRB 080319 B余辉的多波长观测及建模约束

Multi-wavelength observations of afterglow of GRB 080319B and the modeling constraints

S. B. Pandey, A. J. Castro-Tirado, M. Jelínek, Atish P. Kamble, J. Gorosabel, A. de Ugarte Postigo, S. Prins, R. Oreiro, V. Chantry, S. Trushkin, M. Bremer, J. … 展开作者

S. B. Pandey, A. J. Castro-Tirado, M. Jelínek, Atish P. Kamble, J. Gorosabel, A. de Ugarte Postigo, S. Prins, R. Oreiro, V. Chantry, S. Trushkin, M. Bremer, J. M. Winters, A. Pozanenko, Yu. Krugly, I. Slyusarev, G. Kornienko, A. Erofeeva, K. Misra, A. N. Ramprakash, V. Mohan, D. Bhattacharya, A. Volnova, J. Plá, M. Ibrahimov, M. Im, A. Volvach, R. A. M. J. Wijers

摘要:

我们目前的观测余辉的GRB 080319 B在光学,毫米波和射频从几个小时到67天后爆发。利用现有的观测资料和已发表的多波长观测资料,研究了爆发余辉的光变曲线和光谱能量分布。根据观测到的宇宙爆发的性质,并与余辉模型进行了比较,探讨了这一最亮宇宙爆发的本质。结果表明,观测到的余辉特征与环爆介质的星间物质和星风密度分布同样吻合。在两种密度分布的情况下,最大同步加速器频率$ν_m$的位置低于光学频率,冷却中断频率$ν_c$的值低于$X-$射线,即爆发后的$\sim 10^{4}$。此外,在裸眼亮度时的洛伦兹因子的导出值是$\sim 300$,对应的冲击波大小为$\sim 10^{18}$ cm。通过对多波长余辉数据的数值拟合,得到了爆发物理参数的取值范围和爆发的发射机制。

英文摘要:

We present observations of the afterglow of GRB 080319B at optical, mm and radio frequencies from a few hours to 67 days after the burst. Present observations along with other published multi-wavelength data have been used to study the light-curves and spectral energy distributions of the burst afterglow. The nature of this brightest cosmic explosion has been explored based on the observed properties and it's comparison with the afterglow models. Our results show that the observed features of the afterglow fits equally good with the Inter Stellar Matter and the Stellar Wind density profiles of the circum-burst medium. In case of both density profiles, location of the maximum synchrotron frequency $ν_m$ is below optical and the value of cooling break frequency $ν_c$ is below $X-$rays, $\sim 10^{4}$s after the burst. Also, the derived value of the Lorentz factor at the time of naked eye brightness is $\sim 300$ with the corresponding blast wave size of $\sim 10^{18}$ cm. The numerical fit to the multi-wavelength afterglow data constraints the values of physical parameters and the emission mechanism of the burst.

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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