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arXiv 1202.3089astro-ph.HE
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伽玛暴单脉冲各向同性能量与零注量峰值能量之间的关联:走向瞬发辐射的普适物理关联

Correlation between the isotropic energy and the peak energy at zero fluence for the individual pulses of GRBs: towards an universal physical correlation for the prompt emission

Rupal Basak, A. R. Rao

摘要:

我们发现费米卫星探测到的9个伽马射线暴(GRB)的22个脉冲的零注量峰值能量($\rm E_{peak,0}$)和各向同性能量($\rm E_{γ,iso}$)之间有很强的相关性。这种相关性对于每个伽玛暴的单个脉冲都成立,这表明了这种相关性的真实性。与使用$\rm E_{peak}$(代替$\rm E_{peak,0}$)从时间积分谱($r$ = 0.8)或不考虑宽脉冲结构的时间分辨谱($r$ = 0.37)或脉冲式谱($r$ = 0.89)确定的相关性相比,导出的相关性(斯皮尔曼相关系数$r$为0.96)强得多。虽然改进的$\rm E_{peak}$ - $\rm E_{γ,iso}$关系(阿马蒂关系)的脉冲式分析是已知的,这是第一次从一个联合频谱和定时拟合的数据,以提高相关性。我们认为,$\rm E_{peak,0}$,而不是$\rm E_{peak}$,是固有的伽玛暴脉冲和一个自然的选择,作为参数的脉冲式相关研究。

英文摘要:

We find a strong correlation between the peak energy at zero fluence ($\rm E_{peak,0}$) and the isotropic energy ($\rm E_{γ,iso}$) of the 22 pulses of 9 Gamma Ray Bursts (GRB) detected by the Fermi satellite. The correlation holds for the individual pulses of each GRB, which shows the reality of the correlation. The derived correlation (Spearman correlation coefficient, $r$, is 0.96) is much stronger compared to the correlations using $\rm E_{peak}$ (in place of $\rm E_{peak,0}$) determined from the time-integrated spectrum ($r$ = 0.8), or the time-resolved spectrum not accounting for broad pulse structures ($r$ = 0.37), or the pulse-wise spectrum ($r$ = 0.89). Though the improvement in the $\rm E_{peak}$ - $\rm E_{γ,iso}$ relation (the Amati relation) for a pulse-wise analysis is known earlier, this is the first time a parameter derived from a joint spectral and timing fit to the data is shown to improve the correlation. We suggest that $\rm E_{peak,0}$, rather than $\rm E_{peak}$, is intrinsic to a GRB pulse and a natural choice as the parameter in the pulse-wise correlation studies.

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