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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Accès en ligne: | https://arxiv.org/abs/2508.00672 |
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| _version_ | 1866916875685855232 |
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| author | Zheng, Qi Zhu, Xingyv Zhang, Xueguang Yuan, Qirong |
| author_facet | Zheng, Qi Zhu, Xingyv Zhang, Xueguang Yuan, Qirong |
| contents | Double-peaked \oiii~profiles could potentially indicate kiloparsec-scale dual AGNs. We analyze long-term optical light curves of 35 type 1 AGNs with such features from our recent catalog in Zheng et al. (2025). These light curves are obtained from the Catalina Sky Survey and modeled using a Damped Random Walk (DRW) process. A control sample of 210 normal type 1 AGNs matched in redshift, intrinsic luminosity, and black hole mass is also studied. If the double-peaked \oiii~are caused by two type 1 AGNs (dual type 1 AGN), then the combined variability from the two AGNs would be expected to differ from that of a single type 1 AGN. However, there is no statistically significant difference in the variability timescale $τ$ and intrinsic variability amplitude $σ$ between these double-peaked AGNs and the control sample of 210 normal type 1 AGNs. Crucially, computer simulations reveal that dual AGN systems systematically produce lower variability amplitudes than single AGNs, which is inconsistent with the observed variability properties of our double-peaked \oiii~sample. Moreover, simulations suggest that the fraction of dual type 1 AGNs is $\sim$ 3\%, indicating that double-peaked \oiii~may not be a reliable indicator of dual type 1 AGNs in these systems. However, this does not rule out the possibility that some objects may still host dual AGNs involving other combinations, such as type 1+type 2 AGNs. Future studies with larger samples and higher-quality light curves will help clarify the true nature of these systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_00672 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On type 1 active galactic nuclei with double-peaked [O~{\sc iii}]. II. properties of long-term optical variability Zheng, Qi Zhu, Xingyv Zhang, Xueguang Yuan, Qirong Astrophysics of Galaxies Double-peaked \oiii~profiles could potentially indicate kiloparsec-scale dual AGNs. We analyze long-term optical light curves of 35 type 1 AGNs with such features from our recent catalog in Zheng et al. (2025). These light curves are obtained from the Catalina Sky Survey and modeled using a Damped Random Walk (DRW) process. A control sample of 210 normal type 1 AGNs matched in redshift, intrinsic luminosity, and black hole mass is also studied. If the double-peaked \oiii~are caused by two type 1 AGNs (dual type 1 AGN), then the combined variability from the two AGNs would be expected to differ from that of a single type 1 AGN. However, there is no statistically significant difference in the variability timescale $τ$ and intrinsic variability amplitude $σ$ between these double-peaked AGNs and the control sample of 210 normal type 1 AGNs. Crucially, computer simulations reveal that dual AGN systems systematically produce lower variability amplitudes than single AGNs, which is inconsistent with the observed variability properties of our double-peaked \oiii~sample. Moreover, simulations suggest that the fraction of dual type 1 AGNs is $\sim$ 3\%, indicating that double-peaked \oiii~may not be a reliable indicator of dual type 1 AGNs in these systems. However, this does not rule out the possibility that some objects may still host dual AGNs involving other combinations, such as type 1+type 2 AGNs. Future studies with larger samples and higher-quality light curves will help clarify the true nature of these systems. |
| title | On type 1 active galactic nuclei with double-peaked [O~{\sc iii}]. II. properties of long-term optical variability |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.00672 |