Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles
The physical origins of the diverse emission-line asymmetries observed in the spectra of active galactic nuclei (AGNs) are not completely understood. Monitoring the temporal variations of line profiles offers a promising approach to investigating the underlying physics. In this study, we present an...
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| author | Feng-Na Fang Pu Du Michael S. Brotherton Jacob N. McLane T. E. Zastrocky Kianna A. Olson Dong-Wei Bao Shuo Zhai Hua-Rui Bai Yi-Xin Fu Bi-Xuan Zhao Yong-Jie Chen Yue-Chang Peng Yu-Yang Songsheng Yan-Rong Li Chen Hu Ming Xiao Bo-Wei Jiang Yi-Lin Wang Hao Zhang Yu Zhao Jia-Qi Feng Yi-Peng Zhao David H. Kasper William T. Chick My L. Nguyen Jaya Maithil H. A. Kobulnicky D. A. Dale Derek Hand C. Adelman Z. Carter G. M. Murphree M. Oeur S. Schonsberg T. Roth Hartmut Winkler Paola Marziani Mauro D’Onofrio Keith Horne Luis C. Ho Jin-Ming Bai Jian-Min Wang (MAHA Collaboration) |
| author_facet | Feng-Na Fang Pu Du Michael S. Brotherton Jacob N. McLane T. E. Zastrocky Kianna A. Olson Dong-Wei Bao Shuo Zhai Hua-Rui Bai Yi-Xin Fu Bi-Xuan Zhao Yong-Jie Chen Yue-Chang Peng Yu-Yang Songsheng Yan-Rong Li Chen Hu Ming Xiao Bo-Wei Jiang Yi-Lin Wang Hao Zhang Yu Zhao Jia-Qi Feng Yi-Peng Zhao David H. Kasper William T. Chick My L. Nguyen Jaya Maithil H. A. Kobulnicky D. A. Dale Derek Hand C. Adelman Z. Carter G. M. Murphree M. Oeur S. Schonsberg T. Roth Hartmut Winkler Paola Marziani Mauro D’Onofrio Keith Horne Luis C. Ho Jin-Ming Bai Jian-Min Wang (MAHA Collaboration) |
| author_sort | Feng-Na Fang |
| collection | DOAJ |
| description | The physical origins of the diverse emission-line asymmetries observed in the spectra of active galactic nuclei (AGNs) are not completely understood. Monitoring the temporal variations of line profiles offers a promising approach to investigating the underlying physics. In this study, we present an analysis of the broad H β emission line profiles of eight AGNs observed from 2016–2023 May as part of the reverberation mapping campaign titled “Monitoring AGNs with H β Asymmetry,” utilizing data obtained from the Wyoming Infrared Observatory 2.3 m telescope. We measure the temporal variations of line asymmetry, width, and central velocity shift for the eight objects. Our findings reveal that the variation in asymmetry is positively correlated with H β flux in five of the eight objects, while the remaining objects exhibit negative or complex correlations. Furthermore, we observe anticorrelations between line width and H β flux for most objects, indicating the presence of the “breathing” phenomenon in their H β emission lines. In contrast, two objects demonstrate an “anti-breathing” phenomenon or complex behavior. We discuss the physical origins of the temporal variations in line profiles and propose the possibility of decomposing the variations in H β asymmetry and width into components: one that corresponds to short-term variations in H β flux and another that reflects long-term variations in continuum light curves, perhaps driven by radiation pressure. |
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| spelling | doaj-art-9af2d5c33e55446a85388d23944af4ed2025-08-20T02:39:19ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127824310.3847/1538-4365/adcc26Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line ProfilesFeng-Na Fang0https://orcid.org/0009-0009-9945-673XPu Du1https://orcid.org/0000-0002-5830-3544Michael S. Brotherton2https://orcid.org/0000-0002-1207-0909Jacob N. McLane3https://orcid.org/0000-0003-1081-2929T. E. Zastrocky4https://orcid.org/0009-0003-5173-0548Kianna A. Olson5Dong-Wei Bao6https://orcid.org/0000-0003-2024-1648Shuo Zhai7https://orcid.org/0009-0005-4152-2088Hua-Rui Bai8Yi-Xin Fu9https://orcid.org/0009-0004-5259-0900Bi-Xuan Zhao10https://orcid.org/0000-0002-1007-1991Yong-Jie Chen11https://orcid.org/0000-0003-4280-7673Yue-Chang Peng12https://orcid.org/0009-0006-2592-7699Yu-Yang Songsheng13https://orcid.org/0000-0003-4042-7191Yan-Rong Li14https://orcid.org/0000-0001-5841-9179Chen Hu15Ming Xiao16https://orcid.org/0000-0001-5981-6440Bo-Wei Jiang17https://orcid.org/0000-0003-3825-0710Yi-Lin Wang18https://orcid.org/0009-0009-9936-9871Hao Zhang19https://orcid.org/0000-0002-5595-0447Yu Zhao20https://orcid.org/0009-0006-7629-1459Jia-Qi Feng21Yi-Peng Zhao22David H. Kasper23https://orcid.org/0000-0003-0534-6388William T. Chick24https://orcid.org/0000-0002-8818-6780My L. Nguyen25Jaya Maithil26https://orcid.org/0000-0002-4423-4584H. A. Kobulnicky27https://orcid.org/0000-0002-4475-4176D. A. Dale28https://orcid.org/0000-0002-5782-9093Derek Hand29C. Adelman30Z. Carter31https://orcid.org/0009-0006-5373-6515G. M. Murphree32https://orcid.org/0009-0007-7266-8914M. Oeur33https://orcid.org/0000-0001-5636-3108S. Schonsberg34T. Roth35Hartmut Winkler36https://orcid.org/0000-0003-2662-0526Paola Marziani37https://orcid.org/0000-0002-6058-4912Mauro D’Onofrio38https://orcid.org/0000-0001-6441-9044Keith Horne39https://orcid.org/0000-0003-1728-0304Luis C. Ho40https://orcid.org/0000-0001-6947-5846Jin-Ming Bai41Jian-Min Wang42https://orcid.org/0000-0001-9449-9268(MAHA Collaboration)Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cnDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.edu; Physics and Astronomy Department, Regis University , Denver, CO 80212, USADepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduNational Astronomical Observatories, Chinese Academy of Sciences , 20A Datun Road, Chaoyang District, Beijing 100101, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , 20A Datun Road, Chaoyang District, Beijing 100101, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaShanghai Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; Dongguan Neutron Science Center , 1 Zhongziyuan Road, Dongguan 523808, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cnKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cnKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cnKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cnKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; School of Physical Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.eduDepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.edu; Department of Physics & Astronomy, Cal Poly Pomona , Pomona, CA 91768, USADepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.edu; Department of Physics and Astronomy, Trinity University , San Antonio, TX 78212, USADepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.edu; Department of Physics, Rhodes College , Memphis, TN 38112, USADepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.edu; Department of Physics and Astronomy, California State University Long Beach , Long Beach, CA 90840, USADepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.edu; Department of Physics and Astronomy, University of Montana , Missoula, MT 59812, USADepartment of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA ; mbrother@uwyo.edu; Department of Physics & Astronomy, California State University , Sacramento, CA 95747, USADepartment of Physics, University of Johannesburg , P.O. Box 524, 2006 Auckland Park, South AfricaIstituto Nazionale di Astrofisica (INAF) , Osservatorio Astronomico di Padova, I-35122 Padova, ItalyDipartimento di Fisica & Astronomia “Galileo Galilei,” Università di Padova , Padova, ItalySUPA School of Physics and Astronomy , North Haugh, St Andrews, KY16 9SS, Scotland, UKKavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of China; Department of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , Kunming 650011, People’s Republic of ChinaKey Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of China ; dupu@ihep.ac.cn; National Astronomical Observatories, Chinese Academy of Sciences , 20A Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; School of Astronomy and Space Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People’s Republic of ChinaThe physical origins of the diverse emission-line asymmetries observed in the spectra of active galactic nuclei (AGNs) are not completely understood. Monitoring the temporal variations of line profiles offers a promising approach to investigating the underlying physics. In this study, we present an analysis of the broad H β emission line profiles of eight AGNs observed from 2016–2023 May as part of the reverberation mapping campaign titled “Monitoring AGNs with H β Asymmetry,” utilizing data obtained from the Wyoming Infrared Observatory 2.3 m telescope. We measure the temporal variations of line asymmetry, width, and central velocity shift for the eight objects. Our findings reveal that the variation in asymmetry is positively correlated with H β flux in five of the eight objects, while the remaining objects exhibit negative or complex correlations. Furthermore, we observe anticorrelations between line width and H β flux for most objects, indicating the presence of the “breathing” phenomenon in their H β emission lines. In contrast, two objects demonstrate an “anti-breathing” phenomenon or complex behavior. We discuss the physical origins of the temporal variations in line profiles and propose the possibility of decomposing the variations in H β asymmetry and width into components: one that corresponds to short-term variations in H β flux and another that reflects long-term variations in continuum light curves, perhaps driven by radiation pressure.https://doi.org/10.3847/1538-4365/adcc26Reverberation mappingActive galactic nucleiActive galaxiesQuasarsSupermassive black holes |
| spellingShingle | Feng-Na Fang Pu Du Michael S. Brotherton Jacob N. McLane T. E. Zastrocky Kianna A. Olson Dong-Wei Bao Shuo Zhai Hua-Rui Bai Yi-Xin Fu Bi-Xuan Zhao Yong-Jie Chen Yue-Chang Peng Yu-Yang Songsheng Yan-Rong Li Chen Hu Ming Xiao Bo-Wei Jiang Yi-Lin Wang Hao Zhang Yu Zhao Jia-Qi Feng Yi-Peng Zhao David H. Kasper William T. Chick My L. Nguyen Jaya Maithil H. A. Kobulnicky D. A. Dale Derek Hand C. Adelman Z. Carter G. M. Murphree M. Oeur S. Schonsberg T. Roth Hartmut Winkler Paola Marziani Mauro D’Onofrio Keith Horne Luis C. Ho Jin-Ming Bai Jian-Min Wang (MAHA Collaboration) Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles The Astrophysical Journal Supplement Series Reverberation mapping Active galactic nuclei Active galaxies Quasars Supermassive black holes |
| title | Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles |
| title_full | Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles |
| title_fullStr | Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles |
| title_full_unstemmed | Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles |
| title_short | Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles |
| title_sort | monitoring agns with hβ asymmetry v long term variation and evolution of the broad hβ emission line profiles |
| topic | Reverberation mapping Active galactic nuclei Active galaxies Quasars Supermassive black holes |
| url | https://doi.org/10.3847/1538-4365/adcc26 |
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