基于Logistic回归模型的Blazar天体的分类

发布时间：2018-01-09 10:29

本文关键词：基于Logistic回归模型的Blazar天体的分类　出处：《物理学报》2011年11期 　论文类型：期刊论文

【摘要】：从文献中收集了205个Blazar天体,包括142个BLLac天体和63个平谱射电类星体(FSRQs).对这些天体的类别与它们的红移、射电5GHz辐射流量、光学V波段流量、1keV处X射线流量、X射线光子谱指数进行了相关性和Logistic回归分析.结果表明,对Blazar天体分类产生主要影响的因素是红移、射电5GHz辐射流量和X射线光子谱指数,综合应用这三个物理量判别Blazar天体的分类的准确率可达到91.2%,得到的分类方程具有良好的预测效果,可以作为Blazar天体分类的一个重要的判据.而光学V波段流量和1keV处X射线流量不能区分开BLLac天体和FSRQs,它们与Blazar天体分类没有相关性.本文结果支持将BLLac天体和FSRQs归为Blazar天体,不同类别的Blazar天体之间能通过一种演化序列相联系.
[Abstract]:A total of 205 Blazar objects, including 142 BLLac objects and 63 flat-spectrum radio quasars, have been collected from the literature. The correlation and Logistic regression analysis of X-ray photon spectral index at 5GHz radio and 1 Kev optical V-band flow are carried out. The main factors affecting the classification of Blazar objects are redshift, radio 5GHz radiation flux and X-ray photon spectrum index. The accuracy of these three physical quantities in judging the classification of Blazar celestial bodies can be up to 91.2, and the obtained classification equation has a good prediction effect. It can be used as an important criterion for the classification of Blazar objects, but the optical V-band flow and the X-ray flux at 1keV cannot be distinguished between BLLac objects and FSRQs objects. There is no correlation between them and the classification of Blazar objects. In this paper, we support the classification of BLLac objects and FSRQs objects as Blazar objects. Different classes of Blazar objects can be associated by an evolutionary sequence.
【作者单位】：陕西理工学院物理系;北京大学物理学院天文系;
【基金】：国家自然科学基金重点项目(批准号:11033001) 国家重点基础研究发展计划(批准号:2007CB815405)资助的课题~~
【分类号】：P158
【正文快照】： 1.引言Blazar天体是活动星系核(AGNs)中性质较为独特的一个子类,具有大幅快速光变、高的光学偏振、视超光速运动和非热连续辐射等特性[1].Blazar天体分为BL Lac天体和平谱射电类星体(FSRQs),随着观测和研究的深入,分类越来越细,BL Lac天体和FSRQs又分为许多亚类,亚类之间又存

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