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arXiv 0804.2260astro-ph
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伽马射线暴的X射线耀斑观测

Observations of X-ray Flares from Gamma Ray Bursts

A. D. Falcone, D. Morris, J. Racusin, G. Chincarini, A. Moretti, P. Romano, D. N. Burrows, C. Pagani, M. Stroh, D. Grupe, S. Campana, S. Covino, G. Tagliaferri, N. Gehrels

摘要:

在过去的两年中,对伽马射线暴(GRB)和GRB余辉期间的X射线发射的Swift-XRT观测导致了许多新的结果。这些令人兴奋的结果之一是,大约1/3-1/2的伽玛暴包含可检测的X射线耀斑。X射线耀斑的平均通量比初始瞬发辐射的平均通量小约10倍,但在某些情况下,耀斑的能量与瞬发辐射本身一样高。耀斑表现出快速的上升和衰减,它们有时发生在相对于瞬发辐射非常晚的时间(有时迟至T_0后10^5 s),相对于在某些耀斑之前就已经明显开始的潜在余辉衰减,具有非常高的峰值通量。耀斑的时间和光谱特性有利于模型中,耀斑的出现,由于相同的伽玛射线暴内部发动机的过程,催生了即时伽玛射线暴排放。因此,无论是长的还是短的伽马射线暴内部发动机模型,都必须能够在很晚的时间内产生X射线波段的高注量。

英文摘要:

Swift-XRT observations of the X-ray emission from gamma ray bursts (GRBs) and during the GRB afterglow have led to many new results during the past two years. One of these exciting results is that approximately 1/3-1/2 of GRBs contain detectable X-ray flares. The mean fluence of the X-ray flares is ~10 times less than that of the initial prompt emission, but in some cases the flare is as energetic as the prompt emission itself. The flares display fast rises and decays, and they sometimes occur at very late times relative to the prompt emission (sometimes as late as 10^5 s after T_0) with very high peak fluxes relative to the underlying afterglow decay that has clearly begun prior to some flares. The temporal and spectral properties of the flares are found to favor models in which flares arise due to the same GRB internal engine processes that spawned the prompt GRB emission. Therefore, both long and short GRB internal engine models must be capable of producing high fluences in the X-ray band at very late times.

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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