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Black hole mass estimation using a relation between the BLR size and emission line luminosity of AGN
文献类型：期刊论文
| 作者 | Wu, XB ; Wang, R; Kong, MZ; Liu, FK; Han, JL
|
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2004-09-01 |
| 卷号 | 424期号:3页码:793-798 |
| 关键词 | black hole physics galaxies : active galaxies : nuclei quasars : general quasars : emission lines |
| 英文摘要 | An empirical relation between the broad line region (BLR) size and optical continuum luminosity is often adopted to estimate the BLR size and then the black hole mass of AGNs. However, optical luminosity may not be a good indicator of photoionizing luminosity for extremely radio-loud AGNs because the jets usually contribute significantly to the optical continuum. Therefore, the black hole masses derived for blazar-type AGNs with this method are probably overestimated. Here we first derived a tight empirical relation between the BLR size and the H-beta emission line luminosity, R(light-days)=24.05 (L-H beta/10(42) ergs s(-1))(0.68), from a sample of 34 AGNs with the BLR size estimated with the reverberation mapping technique. Then we applied this relation to estimate the black hole masses of some AGNs and found that for many extremely radio-loud AGNs the black hole masses obtained with the R-L-H beta relation are systematically lower than those derived previously with the R-L-5100 Angstrom relation, while for radio-quiet and slightly radio-loud AGNs the results obtained with these two methods are almost the same. The difference of black hole masses estimated with these two relations increases with the radio-loudness for extremely radio-loud AGNs, which is consistent with the fact that their equivalent widths of the H-beta emission line become smaller at greater radio-loudness. If the small H-beta equivalent widths of extremely radio-loud AGNs are indeed caused by the beaming effect, we argue that the optical emission line luminosity may be a better tracer of ionizing luminosity for blazar-type AGNs and the black hole masses derived with the R-L-H beta relation are probably more accurate. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000224480900011 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8403]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100871, Peoples R China 2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, XB,Wang, R,Kong, MZ,et al. Black hole mass estimation using a relation between the BLR size and emission line luminosity of AGN[J]. ASTRONOMY & ASTROPHYSICS,2004,424(3):793-798. |
| APA | Wu, XB,Wang, R,Kong, MZ,Liu, FK,&Han, JL.(2004).Black hole mass estimation using a relation between the BLR size and emission line luminosity of AGN.ASTRONOMY & ASTROPHYSICS,424(3),793-798. |
| MLA | Wu, XB,et al."Black hole mass estimation using a relation between the BLR size and emission line luminosity of AGN".ASTRONOMY & ASTROPHYSICS 424.3(2004):793-798. |
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来源：国家天文台
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