The changing-look AGN SDSS J101152.98+544206.4 is returning to a type I state
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929644458999808 |
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| author | Lyu, Bing Wu, Xue-Bing Pang, Yuxuan Wang, Huimei Zhu, Rui Fu, Yuming Wu, Qingwen Yan, Zhen Yu, Wenfei Liu, Hao Kang, Shi-Ju Jin, Junjie Yang, Jinyi Wang, Feige |
| author_facet | Lyu, Bing Wu, Xue-Bing Pang, Yuxuan Wang, Huimei Zhu, Rui Fu, Yuming Wu, Qingwen Yan, Zhen Yu, Wenfei Liu, Hao Kang, Shi-Ju Jin, Junjie Yang, Jinyi Wang, Feige |
| contents | Aims. We reported the discovery that a changing-look AGN SDSS J101152.98+544206.4 (J1011+5442 for short) gradually returns to the type 1 state after a short period between 2014 and 2019 in the faint type 1.9 state. Methods. Motivated by the rebrightening in optical and mid-infrared light curves from ZTF and WISE, we obtained the new spectroscopic observations by Xinglong 2.16-m, Lijiang 2.4-m, and MMT 6.5-m optical telescopes in 2024. Results. After changing the optical AGN type from 1 to 1.9 between 2003 and 2015 based on the repeat spectroscopy from the Time Domain Spectroscopic Survey, J1011+5442 returns to its type 1 state in 2024. We detect the significant and very broad Hbeta lines (FWHM > 5000 km/s) based on the new spectra, which suggests that J1011+5442 is in the intermediate state between the dim state in 2015 and the bright state in 2003. The long-term optical and mid-infrared light curves also show a brightening trend between 2019 and 2024 as the broad Hbeta line appears. The time lag of about 100 days between the mid-infrared and optical variability is consistent with the prediction of dust reverberation mapping. Conclusions. The behaviors of the photometric and spectroscopic observations of J1011+5442 are consistent with the argument that the repeating changing-look phenomenon is regulated by the variation of accretion rate. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_16879 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The changing-look AGN SDSS J101152.98+544206.4 is returning to a type I state Lyu, Bing Wu, Xue-Bing Pang, Yuxuan Wang, Huimei Zhu, Rui Fu, Yuming Wu, Qingwen Yan, Zhen Yu, Wenfei Liu, Hao Kang, Shi-Ju Jin, Junjie Yang, Jinyi Wang, Feige High Energy Astrophysical Phenomena Aims. We reported the discovery that a changing-look AGN SDSS J101152.98+544206.4 (J1011+5442 for short) gradually returns to the type 1 state after a short period between 2014 and 2019 in the faint type 1.9 state. Methods. Motivated by the rebrightening in optical and mid-infrared light curves from ZTF and WISE, we obtained the new spectroscopic observations by Xinglong 2.16-m, Lijiang 2.4-m, and MMT 6.5-m optical telescopes in 2024. Results. After changing the optical AGN type from 1 to 1.9 between 2003 and 2015 based on the repeat spectroscopy from the Time Domain Spectroscopic Survey, J1011+5442 returns to its type 1 state in 2024. We detect the significant and very broad Hbeta lines (FWHM > 5000 km/s) based on the new spectra, which suggests that J1011+5442 is in the intermediate state between the dim state in 2015 and the bright state in 2003. The long-term optical and mid-infrared light curves also show a brightening trend between 2019 and 2024 as the broad Hbeta line appears. The time lag of about 100 days between the mid-infrared and optical variability is consistent with the prediction of dust reverberation mapping. Conclusions. The behaviors of the photometric and spectroscopic observations of J1011+5442 are consistent with the argument that the repeating changing-look phenomenon is regulated by the variation of accretion rate. |
| title | The changing-look AGN SDSS J101152.98+544206.4 is returning to a type I state |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2412.16879 |