YNAO OpenIR  > 星系研究组
BL Lac型天体
刘碧芳
学位类型硕士
导师谢光中
1990-06-30
学位授予单位中国科学院云南天文台
学位授予地点昆明
摘要本文收集了大量资料,较为全面地总结了BL Lac型天体的观测特性。扼要地介绍了BL Lac型天体的吸积、喷流模型以及喷流给BL Lac型天体所带来的观测效应,同时,对较有生命力但尚不完善的等离子体相干辐射做了简单的介绍。针对BL Lac型天体的短时标光变,利用吸积盘不稳定性引起的有限循环,作者成功地解释了BL Lac型天体ON + 231的短时标光变,并预言可以推广到所有BL Lac型天体。另一方面,结合近年来X射线卫星的观测资料,文章重要点分析了X射线的各种观测特性,并通过对射电选和X射线选的BL Lac天体的射电、光学、X射线光度的相关性分析,得出了双源X射线模型这一结论。本文还对部分有争议的问题进行了讨论。
其他摘要A large number of observation data about BL Lac objects are collected in the compilation. On the basis of this, I analyse and generalize all of the characteristics of BL Lac objects, introduce two kinds of models, i.e. accretion disk and jet. in particular, discuss the coherent collective emission of electromagnetic waves from plasmajet. Using the S-shaped limit cycle around supermassive blackhole, we explain the quasi-periodic short timescale outburst of BL Lac object On + 231. Conclusion is drawn that the accretion of blackhole is the possible energe source of ON + 231. The correlations of radio, optical and X-ray luminosity are examined for the X-ray selected (XS) and radio selected (RS) BL Lac objects. It is found that strong correlations appear between any two monochromatic luminosities for RS objects, however, only the radio and optical are correlated for XS objects. Considering the relativistic effect of jet, we correct the observated flux with Doppler factor δ~(3+α) for RS objects, more strong correlation present. The results are consistent with two components origin for X-ray emission, one is isotropic and one relativistically beamed, the former is dominant intrinsically but the latter dominates observationally. In addition, two open quetions about gravitation lense and relation of BL Lacs and QSOs are discussed.
学科领域天文学
页数131
语种中文
文献类型学位论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7146
专题星系研究组
推荐引用方式
GB/T 7714
刘碧芳. BL Lac型天体[D]. 昆明. 中国科学院云南天文台,1990.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[刘碧芳]的文章
百度学术
百度学术中相似的文章
[刘碧芳]的文章
必应学术
必应学术中相似的文章
[刘碧芳]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。