Feature Extraction and Analysis of Double-Peaked Emission Line Spectra Based on Relevant Subspace
文献类型：期刊论文
| 作者 | Qu Cai-xia1; Yang Hai-feng1; Cai Jiang-hui1; Luo A-li2; Zhang Ji-fu1; Nie Yao-yao1 |
| 刊名 | SPECTROSCOPY AND SPECTRAL ANALYSIS
 |
| 出版日期 | 2019-06-01 |
| 卷号 | 39期号:6页码:1677-1682 |
| 关键词 | Double-peaked emission lines Relevant subspace LAMOST Spectral analysis |
| ISSN号 | 1000-0593 |
| DOI | 10.3964/j.issn.1000-0593(2019)06-1677-06 |
| 英文摘要 | Double-peaked emission lines may reflect some rare scenes, such as binary active nucleus (AGNs), double supermassive black holes (SMBHs), interaction between jet and narrow line regions, or be low-quality spectra. Generally, at least 2 peaks are included in double-peaked emission lines, which are useful in searching rare objects such as AGNs, SMBHs, galaxypairs. It is meaningful in researching double-peaked emission lines for further studying formation and revolution of galaxies and even the universe. In this paper, a new method based on relevant subspace for extracting and analyzing of double-peaked e-mission line spectra is proposed. There are 3 parts in this paper: (1) Sparse difference factor delta is defined to measure attribute difference degree in spectra with double-peaked emission lines. And KNN algorithm is employed to restrain the involved spectral data. Then, characteristics extraction method for low solution spectra is proposed based on relevant subspace. (2) To test the efficient of parameters of sparse difference factor delta and k of KNN algorithm, 664 spectra are selected from LAMOST as training set, including 332 positive samples and 332 negative ones. To ensure 8 lines (H alpha, H beta, [OIII]lambda lambda 4 959, 5 007, [NII]lambda lambda 6 548, 6 584, [SII]lambda lambda 6 717, 6 731) are in wavelength coverage of LAMOST, the redshift region is z<0.3. And then influence of experiment result about two parameters k and alpha of delta threshold is analyzed. The result indicates that distribution of relevant attributes is dense with less sparse points when k=18 and alpha=0.6. (3) Wavelength coverage, red/blue shift interval and line strength ratio of double-peaked emission lines in subspace are analyzed and measured theoretically. Then characteristic description of double peaks based on relevant subspace is given. Finally profiles of double peaks are analyzed according to emission excitation mechanism and line strength relationship. |
| WOS研究方向 | Spectroscopy |
| 语种 | 英语 |
| WOS记录号 | WOS:000474674300004 |
| 出版者 | OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26655]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Yang Hai-feng; Cai Jiang-hui |
| 作者单位 | 1.Taiyuan Univ Sci & Technol, Sch Comp Sci & Technol, Taiyuan 030024, Shanxi, Peoples R China 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qu Cai-xia,Yang Hai-feng,Cai Jiang-hui,et al. Feature Extraction and Analysis of Double-Peaked Emission Line Spectra Based on Relevant Subspace[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2019,39(6):1677-1682. |
| APA | Qu Cai-xia,Yang Hai-feng,Cai Jiang-hui,Luo A-li,Zhang Ji-fu,&Nie Yao-yao.(2019).Feature Extraction and Analysis of Double-Peaked Emission Line Spectra Based on Relevant Subspace.SPECTROSCOPY AND SPECTRAL ANALYSIS,39(6),1677-1682. |
| MLA | Qu Cai-xia,et al."Feature Extraction and Analysis of Double-Peaked Emission Line Spectra Based on Relevant Subspace".SPECTROSCOPY AND SPECTRAL ANALYSIS 39.6(2019):1677-1682. |
入库方式： OAI收割
来源：国家天文台
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