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arXiv 1907.07599astro-ph.HE
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伽马射线暴喷流传播、角结构的发展和光度函数

Gamma-ray burst jet propagation, development of angular structure, and the luminosity function

O. S. Salafia, C. Barbieri, S. Ascenzi, M. Toffano

摘要:

伽马射线暴喷流的命运和可观测的特性,关键取决于它们与围绕中央引擎的原始物质的相互作用。我们提出了一个半分析模型,这种相互作用,它建立在以前的几个分析和数值工作,旨在预测角分布的射流和茧的能量和洛伦兹因子突破后,给定的环境材料和发射时的射流的属性。使用这个模型,我们构建合成人口的结构射流,假设一个恒星(长伽马射线暴-LGRB)或一个二元中子星合并(短伽马射线暴-SGRB)作为祖先。我们假设所有的祖先都是相同的,并且我们在发射时允许喷射特性的变化很小:因此我们的种群具有准通用结构。这些人口能够重现观测到的LGRB和SGRB光度函数的主要特征,虽然一些不确定性和警告仍然有待解决。

英文摘要:

The fate and observable properties of gamma-ray burst jets depend crucially on their interaction with the progenitor material that surrounds the central engine. We present a semi-analytical model of such interaction, which builds upon several previous analytical and numerical works, aimed at predicting the angular distribution of jet and cocoon energy and Lorentz factor after breakout, given the properties of the ambient material and of the jet at launch. Using this model, we construct synthetic populations of structured jets, assuming either a collapsar (for long gamma-ray bursts -- LGRBs) or a binary neutron star merger (for short gamma-ray bursts -- SGRBs) as progenitor. We assume all progenitors to be identical, and we allow little variability in the jet properties at launch: our populations therefore feature a quasi-universal structure. These populations are able to reproduce the main features of the observed LGRB and SGRB luminosity functions, although several uncertainties and caveats remain to be addressed.

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