Time-Evolution of Peak Energy and Luminosity Relation within Pulses for GRB 061007: Probing Fireball Dynamics
Time-Evolution of Peak Energy and Luminosity Relation within Pulses for GRB 061007: Probing Fireball Dynamics
复制标题
DOI：
10.1093/pasj/61.2.201
复制
发表时间：
2008-12
影响因子：
2.3
通讯作者：
M. Ohno;K. Ioka;K. Yamaoka;M. Tashiro;Y. Fukazawa;Y. Nakagawa
中科院分区：
文献类型：
--
作者：
M. Ohno;K. Ioka;K. Yamaoka;M. Tashiro;Y. Fukazawa;Y. Nakagawa
我们使用Suzaku/WAM和Swift/BAT对明亮的长伽马射线暴GRB 061007进行了时间分辨光谱分析。由于WAM的有效面积大，我们可以在1秒的时间分辨率下研究谱峰能量、E峰和光度L t iso的时间演变，我们发现时间分辨脉冲也满足Epeak - Liso关系，这是其他脉冲的时间平均光谱所发现的，表明每个脉冲的物理条件相同。此外，每个脉冲的初始上升相位可能是这种关系的一个异常值，其E峰值大约高2倍。这一差异可能表明火球半径在初始阶段膨胀了2 - 4倍和/或火球的体积洛伦兹因子在初始阶段减速了约4倍，为火球动力学提供了一种新的实时探测方法。
We perform a time-resolved spectral analysis of bright, long Gamma-ray burst GRB 061007 using Suzaku/WAM and Swift/BAT. Thanks to the large effective area of the WAM, we can investigate the time evolution of the spectral peak energy, E peak and the luminosity L t iso with 1-sec time resolution, and we find that the time-resolved pulses also satisfy the Epeak −Liso relation, which was found for the time-averaged spectra of other bursts, suggesting the same physical conditions in each pulse. Furthermore, the initial rising phase of each pulse could be an outlier of this relation with higher E peak value by about factor 2. This difference could suggest that the fireball radius expands by a factor of 2− 4 and/or bulk Lorentz factor of the fireball is decelerated by a factor of ∼ 4 during the initial phase, providing a new probe of the fireball dynamics in real time.