KMS of Xinjiang Astronomical Observatory, CAS
| PKS 0528+134 的多波段多历元观测研究 | |
| Alternative Title | A study on Multi-band and Multi-epoch of PKS 0528+134 |
刘方圆
| |
| Subtype | 硕士 |
| Thesis Advisor | 张明 |
| 2016 | |
| Degree Grantor | 中国科学院大学 |
| Place of Conferral | 北京 |
| Degree Discipline | 天体物理 |
| Keyword | 活动星系核 喷流 活动星系核 喷流 能谱光变视超速运动 |
| Abstract | 活动星系核的起源、结构、演化等课题探索是研究星系，乃至宇宙起源和演化的重要课题，涉及到天体物理学中非常基本的问题。耀变体是活动星系核中非常独特的一个子类，它包含平谱射电类星体和BL Lac天体，是光变极其强烈的天体。耀变体的电磁辐射主要来自于喷流的非热辐射，所以光变或许起源于相对论喷流，因此研究Blazar天体是我们了解辐射区物理性质的重要手段。我们利用VLBI自动成图与分析程序处理了来自3个不同观测计划中 RDV2.3GHz/8.1GHz、MOJAVE 15GHz、VLBA-BU-Blazar 43GHz等4个射电波段的20多年的观测数据。我们结合活动星系核统一模型的相关特性，分析了PKS0528+134的射电喷流本动运动与形态演化、光变和辐射谱的特征、探测到视超光速运动，进行了活动星系核多波段多历元光变曲线和能谱的研究，由于同步加速辐射的谱指数较小，证实PKS0528+134为射电平谱。该结果对我们进一步探索相对论性喷流运动和辐射机制中的喷流模型等相关物理问题提供参考价值。; The origin、structure and evolution of active galactic nuclei (AGN) are significant research topic of galaxy and even origin and evolution of the universe, which involve the basic problems in astrophysics. Blazars are a special kind of AGNs. The AGNs contain flat-spectrum radio quasars and BL Lac objects, with strong flux variability. Their electromagnetic emissions come from the non-thermal radiation of jet mainly, so the flux variablity may originate from the relativistic jet, which is a significant method for understanding the physics of radiation region. We do research about PKS 0528+134. We use the VLBI autotically-mapping and analysis program to deal with the multi-epoch data in four radio bands, which we collected from three different observation plan: 2.3 GHz and 8.1 GHz for RDV, 15 GHz for MOJAVE, as well as 43 GHz for VLBA-BU-Blazar. Based on the relevant features of active galactic nuclei and unified model by analyzing the proper motion and morphological evolution of PKS 0528+134, the apparent super-luminal motions are detected and the light curve and radio spectral index of synchrotron radiation for nearly 20 years are attained, which smaller radio spectral index proves that the spectrum of this source is flat. In addition, by combining the uniformed model for AGN, three works were finished, which include the jet structure, variability and spectrum. The results have strong value for discovering relativistic jet motion and particle acceleration of radiation mechanism. |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/1719 |
| Collection | 研究生学位论文 射电天文研究室 |
| Affiliation | 中国科学院新疆天文台 |
| Recommended Citation GB/T 7714 | 刘方圆. PKS 0528+134 的多波段多历元观测研究[D]. 北京. 中国科学院大学,2016. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| 刘方圆-学位论文.pdf（2427KB） | 学位论文 | 暂不开放 | CC BY-NC-SA | Application Full Text | ||
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