Joint Analysis of Optical, Near-infrared, and Mid-infrared Variability of Four Quasars at Redshift <1
文献类型：期刊论文
| 作者 | Long, Lin1,2,9; Zheng, Zhen-Ya1,9; Jiang, Ning10; Xu, Chun1,9; Lin, Jiaqi1,3,4; Yuan, Fang-Ting1,9; Jiang, Chunyan1,9; Lin, Ruqiu1,2,9; Feng HC(封海成)5,6,7,8; Guo, Hengxiao1,9 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026 |
| 卷号 | 996期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae1b95 |
| 产权排序 | 第7完成单位 |
| 文献子类 | Article |
| 英文摘要 | Amid rapid advances in time-domain astronomy, multiwavelength (e.g., optical and infrared) time-domain studies of quasars remain scarce. Here, we present a systematic analysis of four quasars initially selected by their Ks-band variability amplitudes in the VISTA Variables in the V & iacute;a L & aacute;ctea Survey (VVV/VVVX). For these objects, we obtain complementary optical light curves from Pan-STARRS1 and the Zwicky Transient Facility and W1-band light curves from the Wide-field Infrared Survey Explorer. We perform correlation analysis to study the time lags between different bands, which may be directly related to the size of the dust torus. After correcting for infrared flux contamination from the accretion disk and accounting for the redshift effect, we measure the Ks-optical and W1-optical lags for the targets VVV J1834-2925 and VVV J1845-2426. Using typical sublimation temperatures and reverberation time lags, we obtain a graphite-to-silicate grain size ratio of aC/a(S)similar to 0.4. Through spectral energy distribution fitting, we determine the luminosities of these quasars and find that their dust torus sizes follow the established R-dust-L-AGN relation reported in previous studies. |
| 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 ; BLACK-HOLE MASSES ; REVERBERATION MEASUREMENTS ; DUST TORUS ; INNER RADIUS ; ACCRETION DISKS ; SURVEY-EXPLORER ; POLAR DUST ; AGN TORI ; H-ALPHA |
| 资助项目 | MOST divided by National Key Research and Development Program of China (NKPs)[.2022YFF0503402] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001647918100001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Key Research and Development Program of China (NKPs)[.2022YFF0503402] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28806]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） |
| 通讯作者 | Zheng, Zhen-Ya |
| 作者单位 | 1.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China; zhengzy@shao.ac.cn; 2.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, People’s Republic of China; 3.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People’s Republic of China; 4.CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area, Sun Yat-sen University, Zhuhai 519082, People’s Republic of China; 5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, Yunnan, People’s Republic of China; 6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, Yunnan, People’s Republic of China; 7.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China; 8.Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China 9.CSST Science Center for the Yangtze River Delta Region, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China; 10.Department of Astronomy, University of Science and Technology of China, Hefei 230026, People’s Republic of China; |
| 推荐引用方式 GB/T 7714 | Long, Lin,Zheng, Zhen-Ya,Jiang, Ning,et al. Joint Analysis of Optical, Near-infrared, and Mid-infrared Variability of Four Quasars at Redshift <1[J]. ASTROPHYSICAL JOURNAL,2026,996(1). |
| APA | Long, Lin.,Zheng, Zhen-Ya.,Jiang, Ning.,Xu, Chun.,Lin, Jiaqi.,...&Ji, Xiang.(2026).Joint Analysis of Optical, Near-infrared, and Mid-infrared Variability of Four Quasars at Redshift <1.ASTROPHYSICAL JOURNAL,996(1). |
| MLA | Long, Lin,et al."Joint Analysis of Optical, Near-infrared, and Mid-infrared Variability of Four Quasars at Redshift <1".ASTROPHYSICAL JOURNAL 996.1(2026). |
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来源：云南天文台
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