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arXiv 0902.1644astro-ph.HEastro-ph.CO
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用RHESSI卫星搜索伽马射线暴类

Search for Gamma-Ray Burst Classes with the RHESSI Satellite

J. Řípa, A. Mészáros, C. Wigger, D. Huja, R. Hudec, W. Hajdas

摘要:

本文对RHESSI卫星测量的427个伽马射线暴样本进行了持续时间和硬度比的统计研究。为了比较RHESSI数据库和BATSE数据库中的GRB组数,使用了标准统计检验,如$χ^2$、F检验和极大似然比检验。基于BATSE星表的先前研究声称,除了长群和短群之外,还存在一个中间GRB群。仅使用GRB持续时间$T_{90}$作为信息和$χ^2$或F检验,我们在RHESSI数据中没有发现任何统计学显著的中间组。然而,极大似然比检验揭示了一个显著的中间组。同样使用二维硬度/ $T_{90}$平面,极大似然分析显示了显著的中间组。与BATSE数据库相反,RHESSI数据集中的中间组比长组更难。中间组的存在不仅来自BATSE数据集,也来自RHESSI数据集。

英文摘要:

A sample of 427 gamma-ray bursts (GRBs), measured by the RHESSI satellite, is studied statistically with respect to duration and hardness ratio. Standard statistical tests are used, such as $χ^2$, F-test and the maximum likelihood ratio test, in order to compare the number of GRB groups in the RHESSI database with that of the BATSE database. Previous studies based on the BATSE Catalog claim the existence of an intermediate GRB group, besides the long and short groups. Using only the GRB duration $T_{90}$ as information and $χ^2$ or F-test, we have not found any statistically significant intermediate group in the RHESSI data. However, maximum likelihood ratio test reveals a significant intermediate group. Also using the 2-dimensional hardness / $T_{90}$ plane, the maximum likelihood analysis reveals a significant intermediate group. Contrary to the BATSE database, the intermediate group in the RHESSI data-set is harder than the long one. The existence of an intermediate group follows not only from the BATSE data-set, but also from the RHESSI one.

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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