Emission-line Variable Active Galactic Nuclei at Cosmic Noon from HETDEX
文献类型：期刊论文
| 作者 | Liu, Chenxu1; Kong, Fanchuan1; Cooper, Erin Mentuch2,3; Davis, Dustin2; Guo, Wei-Jian4; Schneider, Donald P.5,6; Xu L(许良)7,8; Gebhardt, Karl2; Hill, Gary J.2,3; Kollatschny, Wolfram9 |
| 刊名 | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
 |
| 出版日期 | 2026-05-01 |
| 卷号 | 284期号:1 |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/ae5803 |
| 产权排序 | 第7完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present the first statistical census of emission-line variable active galactic nuclei (EVA) at cosmic noon by combining untargeted and deep Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) spectroscopy with multiepoch spectra from the Sloan Digital Sky Survey, DESI, and LAMOST. Anchoring all candidates to a HETDEX spectroscopic epoch and requiring an active galactic nucleus (AGN) classification in either the HETDEX or external epoch(s), we identify a homogeneous sample of 100 EVA at z similar to 1.5, including 98 that are newly identified. Emission-line variability is selected primarily through statistically significant line-flux changes, supplemented by extensive visual inspections using contemporaneous photometric light curves. The resulting incidence fraction is fEVA similar to 0.9%. The rest-frame intervals between spectroscopic epochs span similar to 1-10 yr, with brightening and dimming events exhibiting statistically indistinguishable characteristic timescales (Delta T similar to 2.2 and similar to 2.6 yr, respectively). A key result is the characterization of the Baldwin effect in the time domain: while many EVA follow the ensemble Baldwin effect (eBeff) between two epochs, a substantial fraction exhibit apparent anti-eBeff responses. Time-resolved spectroscopy of an individual source reveals that the intrinsic equivalent width-luminosity relation is nonstationary, with the line-to-continuum responsivity systematically evolving from stronger to weaker across successive variability cycles; sparse two-epoch sampling of this evolving intrinsic Baldwin evolution naturally produces both eBeff-like and anti-eBeff behaviors. Finally, EVA show no strong preference for extreme Eddington ratios but exhibit a mild tendency toward lower lambda Edd values relative to matched control samples, driven primarily by sources observed in their dim states. Together, these results establish a coherent framework for interpreting emission-line variability in AGN at the peak epoch of cosmic black hole growth. |
| 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 | DIGITAL SKY SURVEY ; CHANGING-LOOK QUASAR ; EXTREME VARIABILITY QUASARS ; HIGH-REDSHIFT ; DATA RELEASE ; TURN-ON ; SPECTROSCOPIC SURVEY ; HOST GALAXIES ; I. SAMPLE ; SDSS |
| 资助项目 | (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Applied Basic Research Foundation of Yunnan Province (Yunnan Province Applied and Basic Research Foundation)[202401AT070138]; MOST divided by National Key Research and Development Program of China (NKPs)[2024YFA1611603]; Yunnan Key Research and Development Program[02449CE340002] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001751290100001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Applied Basic Research Foundation of Yunnan Province (Yunnan Province Applied and Basic Research Foundation)[202401AT070138] ; MOST divided by National Key Research and Development Program of China (NKPs)[2024YFA1611603] ; Yunnan Key Research and Development Program[02449CE340002] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29188]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） |
| 通讯作者 | Liu, Chenxu |
| 作者单位 | 1.South-Western Institute for Astronomy Research, Key Laboratory of Survey Science of Yunnan Province, Yunnan University, Kunming, Yunnan 650500, People’s Republic of China; cxliu@ynu.edu.cn; 2.Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Austin, TX 78712, USA; 3.McDonald Observatory, The University of Texas at Austin, 2515 Speedway, Austin, TX 78712, USA; 4.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China; 5.Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA; 6.Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA; 7.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China; 8.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China; 9.Institut für Astrophysik, Universität Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen, Germany; 10.Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany; |
| 推荐引用方式 GB/T 7714 | Liu, Chenxu,Kong, Fanchuan,Cooper, Erin Mentuch,et al. Emission-line Variable Active Galactic Nuclei at Cosmic Noon from HETDEX[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2026,284(1). |
| APA | Liu, Chenxu.,Kong, Fanchuan.,Cooper, Erin Mentuch.,Davis, Dustin.,Guo, Wei-Jian.,...&Farrow, Daniel J..(2026).Emission-line Variable Active Galactic Nuclei at Cosmic Noon from HETDEX.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,284(1). |
| MLA | Liu, Chenxu,et al."Emission-line Variable Active Galactic Nuclei at Cosmic Noon from HETDEX".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 284.1(2026). |
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来源：云南天文台
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