BL Lac型天体
文献类型：学位论文
| 作者 | 刘碧芳 |
| 学位类别 | 硕士 |
| 答辩日期 | 1990-06-30 |
| 授予单位 | 中国科学院云南天文台 |
| 授予地点 | 昆明 |
| 导师 | 谢光中 |
| 中文摘要 | 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。 |
| 英文摘要 | 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. |
| 学科主题 | 天文学 |
| 语种 | 中文 |
| 公开日期 | 2016-05-03 |
| 页码 | 131 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/7146]  |
| 专题 | 云南天文台_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. |
入库方式： OAI收割
来源：云南天文台
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