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arXiv 1202.0347astro-ph.HE
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雨燕GRB 090529 A的光学和X射线余辉的浅衰减相:能量注入风型介质?

The shallow-decay phase in both optical and x-ray afterglows of Swift GRB 090529A: Energy injection into a wind-type medium?

L. P. Xin, A. Pozanenko, D. A. Kann, D. Xu, J. Gorosabel, G. Leloudas, J. Y. Wei, M. Andreev, S. F. Qin, M. Ibrahimov, X. H. Han, A. de Ugarte Postigo, Y. L. Qi… 展开作者

L. P. Xin, A. Pozanenko, D. A. Kann, D. Xu, J. Gorosabel, G. Leloudas, J. Y. Wei, M. Andreev, S. F. Qin, M. Ibrahimov, X. H. Han, A. de Ugarte Postigo, Y. L. Qiu, J. S. Deng, A. Volnova, P. Jakobsson, A. J. Castro-Tirado, F. Aceituno, J. P. U. Fynbo, J. Wang, R. Sanchez-Ramirez, V. Kouprianov, W. K. Zheng, J. C. Tello, C. Wu

摘要:

通常采用能量注入模型来解释雨燕伽玛暴X射线余辉的浅衰变相。然而,很少有伽玛暴在其光学和X射线余辉中同时具有能量注入的特征。在这里,我们报告的光学观测伽玛暴090529 A从2000秒到$\sim10^6$秒后的爆发,其中消色差衰减被视为在两个波长。光学光变曲线显示从0.37衰减到0.99,在$\sim10^5$秒处出现中断。在相同的时间间隔内,X射线光变曲线的衰减指数从0.04变为1.2。将这些值与闭合关系进行比较,3 $\times10^{4}$秒后的段与没有任何能量注入的ISM介质中的前向激波的预测一致。在2000到3 $\times10^{4}$秒之间的浅衰减阶段可能是由于在$ν_o < ν_c < ν_x$条件下具有能量注入的风型介质中的外部冲击。然而,光谱区域的约束与多波段观测结果并不一致。对于这种浅衰减阶段,其他模型也是可能的,例如具有演变的微物理参数的能量注入,或离轴观察的射流等。

英文摘要:

The energy injection model is usually proposed to interpret the shallow-decay phase in Swift GRB X-ray afterglows. However, very few GRBs have simultaneous signatures of energy injection in their optical and X-ray afterglows. Here, we report optical observations of GRB 090529A from 2000 sec to $\sim10^6$ sec after the burst, in which an achromatic decay is seen at both wavelengths. The optical light curve shows a decay from 0.37 to 0.99 with a break at $\sim10^5$ sec. In the same time interval, the decay indices of the X-ray light curve changed from 0.04 to 1.2. Comparing these values with the closure relations, the segment after 3$\times10^{4}$ sec is consistent with the prediction of the forward shock in an ISM medium without any energy injection. The shallow-decay phase between 2000 to 3$\times10^{4}$ sec could be due to the external shock in a wind-type-like medium with an energy injection under the condition of $ν_o < ν_c < ν_x$. However, the constraint of the spectral region is not well consistent with the multi-band observations. For this shallow-decay phase, other models are also possible, such as energy injection with evolving microphysical parameters, or a jet viewed off-axis,etc.

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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