arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1408.4121astro-ph.HE
收藏

GRB 140206 A:最远的极化伽马射线暴

GRB 140206A: the most distant polarized Gamma-Ray Burst

D. Gotz, P. Laurent, S. Antier, S. Covino, P. D'Avanzo, V. D'Elia, A. Melandri

摘要:

伽马射线暴(GRB)的瞬发伽玛射线辐射的性质至今还远未完全阐明。线偏振的测量是一个强有力的工具,可以用来把进一步的约束的内容和相对论性的伽玛暴流出的磁化,以及在工作中的辐射过程。到目前为止,只有少数偏振测量可用于伽玛暴的即时发射。在这里,我们提出的即时发射的GRB 140206 A,获得与INTEGRAL/IBIS,斯威夫特/BAT,费米/GBM的分析。使用INTEGRAL/IBIS作为康普顿偏振计,我们能够将该GRB的第二峰的线偏振水平限制为在90% c.l.大于28%。我们还介绍了在国家伽利略望远镜(TNG)获得的GRB余辉光谱,这使我们能够测量这个GRB的距离,z=2.739。这个距离值加上IBIS获得的偏振测量值,使我们能够推导出迄今为止最深和最可靠的极限(xi <1x 10 -16),通过宇宙源上的真空双折射效应测量洛伦兹不变性破坏的可能性。

英文摘要:

The nature of the prompt gamma-ray emission of Gamma-Ray Bursts (GRBs) is still far from being completely elucidated. The measure of linear polarization is a powerful tool that can be used to put further constraints on the content and magnetization of the GRB relativistic outflows, as well as on the radiation processes at work. To date only a handful of polarization measurements are available for the prompt emission of GRBs. Here we present the analysis of the prompt emission of GRB 140206A, obtained with INTEGRAL/IBIS, Swift/BAT, and Fermi/GBM. Using INTEGRAL/IBIS as a Compton polarimeter we were able to constrain the linear polarization level of the second peak of this GRB as being larger than 28% at 90% c.l. We also present the GRB afterglow optical spectroscopy obtained at the Telescopio Nazionale Galileo (TNG), which allowed us the measure the distance of this GRB, z=2.739. This distance value together with the polarization measure obtained with IBIS, allowed us to derive the deepest and most reliable limit to date (xi <1x10-16) on the possibility of Lorentz Invariance Violation, measured through the vacuum birefringence effect on a cosmological source.

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。

↑