Spectral principal component analysis of the Hβ region of low-redshift SDSS quasars
文献类型：期刊论文
| 作者 | Bin Ma1 ; Zhaohui Shang1; Michael SBrotherton3
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| 刊名 | 天文和天体物理学研究:英文版
 |
| 出版日期 | 2019 |
| 卷号 | 19.0期号:012页码:169 |
| 关键词 | quasars:emission lines quasars:general |
| ISSN号 | 1674-4527 |
| 英文摘要 | Studying the relationships among quasar spectral features is essential to unveil the origins of the emission lines and the quasars’ physical processes. Principal component analysis(PCA) is a powerful tool to investigate correlations between variables. Here, we present the results of PCA on the spectra of low-redshift SDSS quasars. The rest-frame wavelength range studied is 4000 – 5500 ?, involving some typical features of quasar spectra, such as Hβ, O Ⅲ and Fe Ⅱ emission lines. The first principal component is the anti-correlation between O Ⅲ and Fe Ⅱ, the well-known eigenvector one(EV1). The next six principal components also show clear(anti-)correlations between line strengths and/or velocity widths of various features, which agree well with measured spectral properties. By comparing the weights of these principal components with other quasar properties, we can identify their underlying drivers. We find that the second principal component represents spectral slope, and can quantify quasar host fraction, intrinsic slope and reddening well. The third component exhibits the velocity width variation of Hβ, and may be a proxy for orientation. In addition, we calculate the fractional-contribution spectra to investigate which components dominate the variance at individual wavelength ranges. Our results also indicate that the optical Fe Ⅱ emission may have distinct origins. |
| 语种 | 英语 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/56621]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.中国科学院国家天文台 2.中国科学院 3.Department of Physics and Astronomy,University of Wyoming,Laramie 4.Tianjin Astrophysics Center,Tianjin Normal University |
| 推荐引用方式 GB/T 7714 | Bin Ma,Zhaohui Shang,Michael SBrotherton. Spectral principal component analysis of the Hβ region of low-redshift SDSS quasars[J]. 天文和天体物理学研究:英文版,2019,19.0(012):169. |
| APA | Bin Ma,Zhaohui Shang,&Michael SBrotherton.(2019).Spectral principal component analysis of the Hβ region of low-redshift SDSS quasars.天文和天体物理学研究:英文版,19.0(012),169. |
| MLA | Bin Ma,et al."Spectral principal component analysis of the Hβ region of low-redshift SDSS quasars".天文和天体物理学研究:英文版 19.0.012(2019):169. |
入库方式： OAI收割
来源：国家天文台
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