Correlation between excitation index and eddington ratio in radio galaxies
文献类型：期刊论文
| 作者 | Hu, Jing-Fu1,4; Cao, Xin-Wu2,3; Chen, Liang1; You, Bei5 |
| 刊名 | Research in astronomy and astrophysics
 |
| 出版日期 | 2016-09-01 |
| 卷号 | 16期号:9页码:8 |
| ISSN号 | 1674-4527 |
| 关键词 | Accretion, accretion disks Black hole physics Galaxies: active |
| DOI | 10.1088/1674-4527/16/9/136 |
| 通讯作者 | Hu, jing-fu(hujingfu@shao.ac.cn) |
| 英文摘要 | We use a sample of 111 radio galaxies with redshift z < 0.3 to investigate their nuclear properties. the black hole masses of the sources in this sample are estimated with the velocity dispersion/luminosity of the galaxies, or the width of the broad-lines. we find that the excitation index, the relative intensity of low and high excitation lines, is correlated with the eddington ratio for this sample. the size of the narrow-line region (nlr) was found to vary with ionizing luminosity as r-nlr proportional to l-ion(0.25) (liu et al. 2013). using this empirical relation, we find that the correlation between the excitation index and the eddington ratio can be reproduced by photoionization models. we adopt two sets of spectral energy distributions (seds), with or without a big blue bump in ultraviolet as the ionizing continuum, and infer that the modeled correlation between the excitation index and the eddington ratio is insensitive to the applied sed. this means that the difference between high excitation galaxies and low excitation galaxies is not caused by the different accretion modes in these sources. instead, it may be caused by the size of the nlr. |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; NARROW-LINE REGION ; BLACK-HOLE MASSES ; QUASARS ; LUMINOSITY ; DICHOTOMY ; SPECTRA ; SAMPLE ; SIZE ; JET |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
| WOS记录号 | WOS:000385995800004 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2374774 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Hu, Jing-Fu |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland |
| 推荐引用方式 GB/T 7714 | Hu, Jing-Fu,Cao, Xin-Wu,Chen, Liang,et al. Correlation between excitation index and eddington ratio in radio galaxies[J]. Research in astronomy and astrophysics,2016,16(9):8. |
| APA | Hu, Jing-Fu,Cao, Xin-Wu,Chen, Liang,&You, Bei.(2016).Correlation between excitation index and eddington ratio in radio galaxies.Research in astronomy and astrophysics,16(9),8. |
| MLA | Hu, Jing-Fu,et al."Correlation between excitation index and eddington ratio in radio galaxies".Research in astronomy and astrophysics 16.9(2016):8. |
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来源：中国科学院大学
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