arXiv 0705.40202007-05astro-ph

三类伽马射线暴的统计证据

Statistical Evidence for Three classes of Gamma-ray Bursts

Tanuka Chattopadhyay, Ranjeev Misra, Asis Kumar Chattopadhyay, Malay Naskar

备注：: 7 pages, accepted for publication in the Astrophysical Journal. Minor editorial changes
发表信息：: Astrophys.J.667:1017-1023,2007
DOI：: 10.1086/520317

摘要：

两种不同的多元聚类技术，K-均值分割方法和Dirichlet过程的混合建模，已被应用到BATSE伽马射线暴（GRB）目录，以获得最佳的相干组的数量。在标准范式中，伽玛暴仅分为两类，长爆发和短爆发。然而，对于这两种聚类技术，最佳的类数被发现是三个，这与以前的统计分析的结果是一致的。在这种分类中，长暴又被进一步分为两组，这两组主要根据它们的总注量和持续时间来区分，因此被称为低注量和高注量GRB。对已知红移和光谱参数的伽玛暴的分析表明，低注量伽玛暴的各向同性能量输出为10^{52}尔格，而高注量伽玛暴的各向同性能量输出范围为10^{52}~ 10^{54}尔格。据推测，这三种伽玛暴反映了三种不同的起源：中子星系统的合并、白矮星与中子星的合并以及大质量恒星的坍缩。

英文摘要：

Two different multivariate clustering techniques, the K-means partitioning method and the Dirichlet process of mixture modeling, have been applied to the BATSE Gamma-ray burst (GRB) catalog, to obtain the optimum number of coherent groups. In the standard paradigm, GRB are classified in only two groups, the long and short bursts. However, for both the clustering techniques, the optimal number of classes was found to be three, a result which is consistent with previous statistical analysis. In this classification, the long bursts are further divided into two groups which are primarily differentiated by their total fluence and duration and hence are named low and high fluence GRB. Analysis of GRB with known red-shifts and spectral parameters suggests that low fluence GRB have nearly constant isotropic energy output of 10^{52} ergs while for the high fluence ones, the energy output ranges from 10^{52} to 10^{54} ergs. It is speculated that the three kinds of GRBs reflect three different origins: mergers of neutron star systems, mergers between white dwarfs and neutron stars, and collapse of massive stars.

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。

摘要：

英文摘要：

相关论文