KMS of Xinjiang Astronomical Observatory, CAS
| 窄线塞弗特I型星系性质研究 | |
| Alternative Title | Research of Narrow-line Seyfert 1 Galaxies Properties |
杨平平
| |
| Subtype | 硕士 |
| Thesis Advisor | 刘祥 |
| 2016 | |
| Degree Grantor | 中国科学院大学 |
| Place of Conferral | 北京 |
| Degree Discipline | 天体物理 |
| Keyword | 塞弗特i型星系 黑洞质量 爱丁顿比 软x射线 黑洞自旋 |
| Abstract | 活动星系核是星系中心由大质量黑洞吸积产生的活动区域，塞弗特星系是活动星系核的子类。我们主要对塞弗特 I 型星系进行了研究，特别是窄线塞弗特 I 型星系与宽线塞弗特 I 型星系的质量和爱丁顿比为啥不一样，并对软X-ray 过剩现象进行了研究。 通过假设宽线区是较平的结构（非球形）和视线夹角（视线与喷流的夹角）的取向效应来校正观测到的谱线宽度，计算黑洞质量和爱丁顿比，发现窄线塞弗特 I 型星系和宽线塞弗特 I 型星系的黑洞质量和爱丁顿比有着相似的分布。表明两类源的基本参数是统一的，只是人为的选择效应造成计算结果的差异。通过对源 PMN J0948+002 的 X-ray 能谱拟合和相关性分析研究表明其软 X- ray波段的辐射可能来自吸积盘或者冕的黑体辐射，而高能X-ray 来自喷流的同步辐射。最后利用塞弗特 I 型星系样本的研究了射电功率与黑洞质量和爱丁顿比的相关性，即P_(jet)∝(λm)^μ，而射电噪度与黑洞质量和爱丁顿比的相关性R∝(λm)^ρ满足关系式ρ=（7/6）μ-1。我们认为射电弱窄线塞弗特 I型星系的喷流是由吸积和黑洞自旋共同作用的，而射电噪窄线塞弗特 I 型星系的喷流是吸积主导的。 我们通过研究得到了窄线和宽线塞弗特 I 型星系的质量和爱丁顿比是相似的；进行了软 X-ray 过剩的能谱拟合；并研究了喷流功率和吸积盘光度的相关性，对塞弗特 I 型星系有了更深入的了解。 |
| Other Abstract | Active galactic nuclei (AGN) is the central area whose luminosity is dominated by massive black hole accretion. Seyfert galaxy is a subclass of AGN. We mainly studied the Seyfert 1 galaxy, especially the Narrow-line Seyfert 1 galaxies (NLS1s) and the Broad-line Seyfert 1 galaxies (BLS1s), why they have quite different black hole masses and Eddington ratios, and we also studied the phenomenon of soft X-ray excess. By assuming the structure of the broad line region being relatively flat (non- spherical) and the angle of sight line to jet orientation and with the corrected spectral line width, we computed the black hole mass and Eddington ratios, find that the black hole mass and Eddington ratio have similar distribution for NLS1s and BLS1s. These indicate the intrinsic parameters of NLS1s and BLS1s could have similar properties, the differences observed could be attributed to the selection effect. Through the spectrum fitting and correlation analysis for the source NLS1 PMN J0948+002 in X- ray, it is showed that the soft X-ray radiation is blackbody which most likely from the accretion disk or corona, and the high energy X-ray spectrum is a power law which from the jet. Finally, we studied the sample of Seyfert 1 galaxies with the correlation between the jet power and accretion disk luminosityP_(jet)∝(λm)^μ, and the correlation between radio loudness and λm, R ∝ （λm）^ρ, and the relation of ρ =(7/6) μ−1. The result implies that the jet of RQ-NLS1s may be produced by the hybrid of accretion and spin of black hole, the jet power of RL-NLS1s is dominated by the accretion disk. In summary, we found that the BH mass and Eddington ratio have similar distribution for the NLS1s and BLS1s; we studied the excess soft X-ray, as well as the correlation between jet power and disk luminosity, we have gained deeper understanding of Seyfert 1 galaxies. |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/1725 |
| 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 | 杨平平. 窄线塞弗特I型星系性质研究[D]. 北京. 中国科学院大学,2016. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| 杨平平-学位论文.pdf（2685KB） | 学位论文 | 暂不开放 | CC BY-NC-SA | Application Full Text | ||
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