The Most Luminous Hβ Reverberation Mapping of E1821+643 Indicates the Lower Boundary of the Radius-Luminosity Relation
文献类型：期刊论文
| 作者 | Li SS(李莎莎)1,2,3,7; Feng HC(封海成)1,2,3,7; Wu, Jiancheng5,6; Bai JM(白金明)1,2,3,7; Liu HT(刘洪涛)1,2,3; Lu KX(卢开兴)1,2,3; Sun, Mouyuan4; Wang JG(王建国)1,2,3 |
| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2026-02-20 |
| 卷号 | 998期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae3de1 |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | The radius-luminosity (RBLR-L5100) relation is fundamental to active galactic nucleus (AGN) studies, enabling supermassive black hole (SMBH) mass estimates and AGN-based cosmology applications. However, its high-luminosity end remains poorly calibrated due to insufficient reliable reverberation mapping (RM) data. We present a four-year RM campaign of the luminous quasar E1821+643 using the Lijiang 2.4 m telescope, supplemented by archival multiwavelength data. E1821+643 is the most luminous AGN with an H beta RM measurement to date. The measured time lag of 83.2-18.7+17.5 days is a factor of 5.6 shorter than predicted by the canonical RBLR-L5100 relation. By compiling the full H beta RM sample, we find that such deviation defines a lower envelope (0.2RBLR) of measured lags across the entire luminosity range, while the upper envelope lies near 2RBLR, implying that the scatter for individual AGNs can reach 1 dex. Spectral decomposition reveals two distinct H beta components: a core component with a lag of 267.0-17.6+16.6 days closer to the RBLR-L5100 relation, and a redshifted tail with a much shorter lag of -49.0 -34.5+50.5 days. The short-lag component not only accounts for the significantly shortened overall lag but also leads to an opposite interpretation of the intrinsic broad-line region (BLR) kinematics. These effects can introduce systematic uncertainties in black hole mass estimates by factors of up to tens. Our findings demonstrate that shortened lags in high-accretion-rate AGNs arise from multicomponent BLR structures, posing substantial challenges to single-epoch mass estimates and impacting SMBH demographics and cosmological applications. |
| 学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; BROAD-LINE REGION ; SUPERMASSIVE BLACK-HOLES ; VIRIAL FACTOR ; NGC 4151 ; ACCRETION DISKS ; QUASARS ; SIZE ; LAGS ; OUTBURST |
| 资助项目 | National Natural Science Foundation of China[12203096] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001694218400001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Natural Science Foundation of China[12203096] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28930]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） |
| 通讯作者 | Feng HC(封海成) |
| 作者单位 | 1.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China; 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, Yunnan, People’s Republic of China; 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, Yunnan, People’s Republic of China; hcfeng@ynao.ac.cn; 4.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China 5.Department of Astronomy, School of Physics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, People’s Republic of China; 6.Institute for Astronomy, School of Physics, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, People’s Republic of China; 7.Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; |
| 推荐引用方式 GB/T 7714 | Li SS,Feng HC,Wu, Jiancheng,et al. The Most Luminous Hβ Reverberation Mapping of E1821+643 Indicates the Lower Boundary of the Radius-Luminosity Relation[J]. ASTROPHYSICAL JOURNAL,2026,998(2). |
| APA | 李莎莎.,封海成.,Wu, Jiancheng.,白金明.,刘洪涛.,...&王建国.(2026).The Most Luminous Hβ Reverberation Mapping of E1821+643 Indicates the Lower Boundary of the Radius-Luminosity Relation.ASTROPHYSICAL JOURNAL,998(2). |
| MLA | 李莎莎,et al."The Most Luminous Hβ Reverberation Mapping of E1821+643 Indicates the Lower Boundary of the Radius-Luminosity Relation".ASTROPHYSICAL JOURNAL 998.2(2026). |
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来源：云南天文台
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