arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.04871astro-ph.HEastro-ph.IM
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POLAR伽马射线暴偏振星表

The POLAR Gamma-Ray Burst Polarization Catalog

Merlin Kole, Nicolas De Angelis, Francesco Berlato, J. Michael Burgess, Neal Gauvin, Jochen Greiner, Wojtek Hajdas, Han-Cheng Li, Zheng-Heng Li, Nicolas Produit… 展开作者

Merlin Kole, Nicolas De Angelis, Francesco Berlato, J. Michael Burgess, Neal Gauvin, Jochen Greiner, Wojtek Hajdas, Han-Cheng Li, Zheng-Heng Li, Nicolas Produit, Dominik Rybka, Li-Ming Song, Jian-Chao Sun, Jaszek Szabelski, Teresa Tymieniecka, Yuan-Hao Wang, Bo-Bing Wu, Xin Wu, Shao-Lin Xiong, Shuang-Nan Zhang, Yong-Jie Zhang

摘要:

尽管经过了50多年的研究,关于伽玛暴的起源和性质仍然存在许多悬而未决的问题。对这些极端现象的瞬时发射的偏振测量一直被认为是回答一系列这些问题的关键。POLAR探测器的设计是为了在大约50-500 keV的能量范围内产生第一组详细和可靠的偏振测量。在2016年底和2017年初,POLAR共探测到55个GRB。其中5个伽玛暴的分析结果已在过去报道过。结果被认为是一致的低或非偏振通量。然而,其他合作机构以前的报告发现两极分化程度很高。我们研究了所有14个伽玛暴观测的POLAR统计稳健的推论是可能的极化。此外,时间分辨极化的研究进行了足够的视流量的伽玛暴。一个公开可用的偏振分析工具,在3 ML框架内开发,用于产生统计上稳健的结果。该方法允许结合光谱和偏振数据从POLAR与光谱数据从费米GBM和Swift-BAT联合建模的光谱和偏振参数。时间积分分析发现,所有的结果是兼容的低或零偏振的警告,当时间分辨分析是可能的,在个别脉冲,我们观察到温和的偏振与迅速变化的偏振角。因此,时间积分偏振结果虽然指向较低的偏振,但可能是在变化的偏振信号上求和的伪像,从而洗掉了真正的中等偏振。因此,我们警告不要过度解释任何时间积分的结果,并鼓励人们等待更详细的偏振测量从即将到来的任务,如POLAR-2和LEAP。

英文摘要:

Despite over 50 years of research, many open questions remain about the origin and nature of GRBs. Polarization measurements of the prompt emission of these extreme phenomena have long been thought to be the key to answering a range of these questions. The POLAR detector was designed to produce the first set of detailed and reliable polarization measurements in an energy range of approximately 50-500 keV. During late 2016 and early 2017, POLAR detected a total of 55 GRBs. Analysis results of 5 of these GRBs have been reported in the past. The results were found to be consistent with a low or unpolarized flux. However, previous reports by other collaborations found high levels of polarization. We study the polarization for all the 14 GRBs observed by POLAR for which statistically robust inferences are possible. Additionally, time-resolved polarization studies are performed on GRBs with sufficient apparent flux. A publicly available polarization analysis tool, developed within the 3ML framework, was used to produce statistically robust results. The method allows to combine spectral and polarimetric data from POLAR with spectral data from the Fermi GBM and Swift-BAT to jointly model the spectral and polarimetric parameters. The time integrated analysis finds all results to be compatible with a low or zero polarization with the caveat that, when time-resolved analysis is possible within individual pulses, we observe moderate polarization with a rapidly changing polarization angle. Thus, time-integrated polarization results, while pointing to lower polarization are potentially an artifact of summing over the changing polarization signal and thus, washing out the true moderate polarization. Therefore, we caution against over interpretation of any time-integrated results and encourage one to wait for more detailed polarization measurements from forthcoming missions such as POLAR-2 and LEAP.

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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