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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2504.08039 |
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| author | Lin, Xiaojing Fan, Xiaohui Wang, Feige Sun, Fengwu Champagne, Jaclyn B. Egami, Eiichi Kakiichi, Koki Lyu, Jianwei Tee, Wei Leong Yang, Jinyi Bian, Fuyan Bosman, Sarah E. I. Cai, Zheng Casey, Caitlin M. Decarli, Roberto Faisst, Andreas L. Fujimoto, Seiji Harish, Santosh Ilbert, Olivier Inoue, Akio K. Jin, Xiangyu Kartaltepe, Jeyhan S. Kocevski, Dale D. Li, Mingyu Liu, Weizhe Liu, Yichen Schindler, Jan-Torge Shuntov, Marko Tanaka, Takumi S. Vestergaard, Marianne Wu, Yunjing Zhang, Haowen Zhang, Zijian |
| author_facet | Lin, Xiaojing Fan, Xiaohui Wang, Feige Sun, Fengwu Champagne, Jaclyn B. Egami, Eiichi Kakiichi, Koki Lyu, Jianwei Tee, Wei Leong Yang, Jinyi Bian, Fuyan Bosman, Sarah E. I. Cai, Zheng Casey, Caitlin M. Decarli, Roberto Faisst, Andreas L. Fujimoto, Seiji Harish, Santosh Ilbert, Olivier Inoue, Akio K. Jin, Xiangyu Kartaltepe, Jeyhan S. Kocevski, Dale D. Li, Mingyu Liu, Weizhe Liu, Yichen Schindler, Jan-Torge Shuntov, Marko Tanaka, Takumi S. Vestergaard, Marianne Wu, Yunjing Zhang, Haowen Zhang, Zijian |
| contents | We report the discovery of 13 broad-line AGNs at $z = 5 - 8$ from the first 10% data of the JWST Cycle 3 Treasury Program COSMOS-3D. These AGNs are identified by their broad H$α$ or H$β$ emission lines through the NIRCam grism wide-field slitless spectroscopy. One object at $z = 7.646$ with broad H$β$ emission has an F444W magnitude of 23.6 mag, making it one of the brightest $z > 7.5$ broad-line AGNs yet known. Among the 13 AGNs, 10 objects have reddened optical continua with slopes $β_{\rm opt}>0$. The remaining three objects have their overall SEDs that resemble those of UV-luminous quasars at similar redshifts, but their $β_{\rm opt}$, though negative, are not as blue as those of unobscured quasars. We also obtain MIRI photometry at 7.7-18 $μ$m for two AGNs and place strong constraints on their rest-frame near-IR SED. We find no significant variability in the rest-frame UV by comparing the COSMOS-3D and COSMOS-Web F115W images taken apart by 60 days in the rest-frame. We compute the H$α$ luminosity functions (LFs) for the broad H$α$ emitters at $z \approx 5-6$ and find a potential redshift evolution when compared with that of the $z \approx 4-5$ sample. We also derive the H$β$ LF at $z\sim8$ for AGNs and galaxies by combining our sample with those from the literature. The broad H$β$ emitters in this work suggest a number density two orders of magnitude higher than that predicted by the quasar LF based on rest-frame UV-selected samples. As a preview, our work showcases the ability of the COSMOS-3D grism survey to provide a complete view of the properties, growth, and evolution of bright broad-line AGNs at $z>5$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_08039 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bridging Quasars and Little Red Dots: Insights into Broad-Line AGNs at $z=5-8$ from the First JWST COSMOS-3D Dataset Lin, Xiaojing Fan, Xiaohui Wang, Feige Sun, Fengwu Champagne, Jaclyn B. Egami, Eiichi Kakiichi, Koki Lyu, Jianwei Tee, Wei Leong Yang, Jinyi Bian, Fuyan Bosman, Sarah E. I. Cai, Zheng Casey, Caitlin M. Decarli, Roberto Faisst, Andreas L. Fujimoto, Seiji Harish, Santosh Ilbert, Olivier Inoue, Akio K. Jin, Xiangyu Kartaltepe, Jeyhan S. Kocevski, Dale D. Li, Mingyu Liu, Weizhe Liu, Yichen Schindler, Jan-Torge Shuntov, Marko Tanaka, Takumi S. Vestergaard, Marianne Wu, Yunjing Zhang, Haowen Zhang, Zijian Astrophysics of Galaxies We report the discovery of 13 broad-line AGNs at $z = 5 - 8$ from the first 10% data of the JWST Cycle 3 Treasury Program COSMOS-3D. These AGNs are identified by their broad H$α$ or H$β$ emission lines through the NIRCam grism wide-field slitless spectroscopy. One object at $z = 7.646$ with broad H$β$ emission has an F444W magnitude of 23.6 mag, making it one of the brightest $z > 7.5$ broad-line AGNs yet known. Among the 13 AGNs, 10 objects have reddened optical continua with slopes $β_{\rm opt}>0$. The remaining three objects have their overall SEDs that resemble those of UV-luminous quasars at similar redshifts, but their $β_{\rm opt}$, though negative, are not as blue as those of unobscured quasars. We also obtain MIRI photometry at 7.7-18 $μ$m for two AGNs and place strong constraints on their rest-frame near-IR SED. We find no significant variability in the rest-frame UV by comparing the COSMOS-3D and COSMOS-Web F115W images taken apart by 60 days in the rest-frame. We compute the H$α$ luminosity functions (LFs) for the broad H$α$ emitters at $z \approx 5-6$ and find a potential redshift evolution when compared with that of the $z \approx 4-5$ sample. We also derive the H$β$ LF at $z\sim8$ for AGNs and galaxies by combining our sample with those from the literature. The broad H$β$ emitters in this work suggest a number density two orders of magnitude higher than that predicted by the quasar LF based on rest-frame UV-selected samples. As a preview, our work showcases the ability of the COSMOS-3D grism survey to provide a complete view of the properties, growth, and evolution of bright broad-line AGNs at $z>5$. |
| title | Bridging Quasars and Little Red Dots: Insights into Broad-Line AGNs at $z=5-8$ from the First JWST COSMOS-3D Dataset |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.08039 |