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arXiv 0809.5206astro-ph
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能谱关联与快速伽玛暴

Spectrum-Energy Correlations and Swift GRBs

Lorenzo Amati

摘要:

红移校正后的nFn谱峰的光子能量(Ep,i)与各向同性等效辐射能量(Eiso)之间的相关性是伽马射线暴(GRB)天体物理学中最有趣和最有争议的观测证据之一。为了充分利用这种相关性来理解GRB物理并将其用作宇宙学工具,我们需要了解并减少具有已知红移的GRB样本中的选择效应和偏差。Swift卫星以其科学有效载荷和前所未有的旋转能力为我们提供了新的观测证据,并在GRB红移估计过程中减少了选择效应。我讨论了雨燕伽玛暴的位置在Ep,i-Eiso平面和主要的影响,特别强调选择效应,亚能量长伽玛暴的存在和性质,GRB-SN连接,长和短伽玛暴之间的差异和最近发现的子类的长伽玛暴没有关联的超新星。我还简要回顾了Swift观测对3参数谱能量相关性的影响,这已被提出作为一个潜在的强大工具,标准化伽玛暴的宇宙学参数的估计。

英文摘要:

The correlation between the photon energy at which the redshift corrected nFn spectrum peaks (hence called "peak energy", Ep,i) and the isotropic equivalent radiated energy (Eiso), is one of the most intriguing and debated observational evidences in Gamma- Ray Bursts (GRB) astrophysics. In order to fully exploit this correlation to understand GRB physics and use them as a cosmological tool, we need to understand and reduce selection effects and biases in the sample of GRBs with known redshift. The Swift satellite, thanks to its scientific payload and unprecedented slewing capabilities, is providing us new observational evidences and a reduction of selection effects in the process of GRB redshift estimate. I discuss the location of Swift GRBs in the Ep,i-Eiso plane and the main implications, with particular emphasis on selection effects, the existence and nature of sub-energetic long GRBs, the GRB-SN connection, the difference between long and short GRBs and the recently discovered sub-class of long GRBs without association with a hypernova. I also briefly review the impact of Swift observations on 3-parameters spectrum-energy correlations, which have been proposed as a potentially powerful tool to standardize GRBs for the estimate of cosmological parameters.

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