arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0809.1026astro-ph
收藏

伽马射线暴中的耀斑

Flares in Gamma Ray Bursts

G. Chincarini, J. Mao, F. Pasotti, R. Margutti, G. Guidorzi, M. G. Bernardini, Swift Italian team

摘要:

用雨燕卫星上的XRT(0.3-10 KeV)仪器在伽马射线暴瞬时发射后不久观测到的耀斑活动,为伽马射线暴能量发射机制的物理特征提供了重要线索。我们将简要介绍最近的分析结果,并讨论我们根据Norris 2005剖面对耀斑的拟合,用一个新的更大样本的GRB [限于早期耀斑]获得的初步结果。我们发现,与以前的结果一致,XRT耀斑遵循诺里斯2005年观察到的主要特征的即时发射尖峰。估计的耀斑能量的子样本与红移是相当强大的,并尝试,使用redshisft样本,估计耀斑中发射的能量如何依赖于时间。我们使用了$H_0=70 km/s/Mpc$、$Ω_Λ=0.7$、$Ω_m=0.3$宇宙学。

英文摘要:

The flare activity that is observed in GRBs soon after the prompt emission with the XRT (0.3-10 KeV) instrument on board of the Swift satellite is leading to important clues in relation to the physical characteristics of the mechanism generating the emission of energy in Gamma Ray Bursts. We will briefly refer to the results obtained with the recent analysis and and discuss the preliminary results we obtained with a new larger sample of GRBs [limited to early flares] based on fitting of the flares using the Norris 2005 profile. We find, in agreement with previous results, that XRT flares follow the main characteristics observed in Norris 2005 for the prompt emission spikes. The estimate of the flare energy for the subsample with redshift is rather robust and an attempt is made, using the redshisft sample, to estimate how the energy emitted in flares depends on time. We used a $H_0=70 km/s/Mpc$, $Ω_Λ=0.7$, $Ω_m=0.3$ cosmology.

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。

↑