Undermassive Hosts of $z = 4-6 $ AGN from JWST/NIRCam Image Decomposition with CONGRESS, FRESCO, and JADES
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| Format: | Preprint |
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2026
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| author | Ma, Zheng Egami, Eichi Zhu, Yongda Sun, Fengwu Lyu, Jianwei Zhang, Junyu Willmer, Christopher N. A. Bunker, Andrew J. Carniani, Stefano Curtis-Lake, Emma Hausen, Ryan Ji, Xihan Ji, Zhiyuan Juodžbalis, Ignas Maiolino, Roberto Rieke, George H. Rinaldi, Pierluigi Sun, Yang Tacchella, Sandro Übler, Hannah Williams, Christina C. |
| author_facet | Ma, Zheng Egami, Eichi Zhu, Yongda Sun, Fengwu Lyu, Jianwei Zhang, Junyu Willmer, Christopher N. A. Bunker, Andrew J. Carniani, Stefano Curtis-Lake, Emma Hausen, Ryan Ji, Xihan Ji, Zhiyuan Juodžbalis, Ignas Maiolino, Roberto Rieke, George H. Rinaldi, Pierluigi Sun, Yang Tacchella, Sandro Übler, Hannah Williams, Christina C. |
| contents | In the local Universe, supermassive black hole (SMBH) masses strongly correlate with their host-galaxies' stellar masses ($M_{*}$), but galaxies hosting faint AGN recently found by JWST may deviate from this relation. To constrain the M$_{\text{BH}}$-M$_{*}$ relation at high redshift, we performed AGN-host image decomposition for 17 low-luminosity AGN galaxies at $z$\,$\sim$\,4--6 using NIRCam images in the JADES GOODS-N field. These sources are identified as AGNs from broad H$α$ emission lines detected by the CONGRESS and FRESCO surveys. We used \textsc{galfit+MCMC} to fit spatial profiles in 7 wide-band images and detected extended emission in 9 sources out of 17. The close spatial alignment between the extended components and the AGN centers indicates that this emission likely originates from the host galaxies. These sources are extended at 0.9--2.0~$μ$m, suggesting significant host-galaxy light in the rest-frame UV. For the sources with the host detection, the stellar mass inferred based on image decomposition result can be 1-2 dex lower than the results without image decomposition. The BH-to-stellar mass ratio spans $M_{\text{BH}}/M_\ast$\,$\sim$\,0.01--1.48, placing them well above the local $M_{\text{BH}}$--$M_\ast$ relation. In contrast, the host-galaxy size--mass relation broadly agrees with previous measurements. Our results suggest that the host galaxies of these faint AGN are either genuinely under-massive compared to their black hole masses, or too compact to be spatially resolved. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_15962 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Undermassive Hosts of $z = 4-6 $ AGN from JWST/NIRCam Image Decomposition with CONGRESS, FRESCO, and JADES Ma, Zheng Egami, Eichi Zhu, Yongda Sun, Fengwu Lyu, Jianwei Zhang, Junyu Willmer, Christopher N. A. Bunker, Andrew J. Carniani, Stefano Curtis-Lake, Emma Hausen, Ryan Ji, Xihan Ji, Zhiyuan Juodžbalis, Ignas Maiolino, Roberto Rieke, George H. Rinaldi, Pierluigi Sun, Yang Tacchella, Sandro Übler, Hannah Williams, Christina C. Astrophysics of Galaxies In the local Universe, supermassive black hole (SMBH) masses strongly correlate with their host-galaxies' stellar masses ($M_{*}$), but galaxies hosting faint AGN recently found by JWST may deviate from this relation. To constrain the M$_{\text{BH}}$-M$_{*}$ relation at high redshift, we performed AGN-host image decomposition for 17 low-luminosity AGN galaxies at $z$\,$\sim$\,4--6 using NIRCam images in the JADES GOODS-N field. These sources are identified as AGNs from broad H$α$ emission lines detected by the CONGRESS and FRESCO surveys. We used \textsc{galfit+MCMC} to fit spatial profiles in 7 wide-band images and detected extended emission in 9 sources out of 17. The close spatial alignment between the extended components and the AGN centers indicates that this emission likely originates from the host galaxies. These sources are extended at 0.9--2.0~$μ$m, suggesting significant host-galaxy light in the rest-frame UV. For the sources with the host detection, the stellar mass inferred based on image decomposition result can be 1-2 dex lower than the results without image decomposition. The BH-to-stellar mass ratio spans $M_{\text{BH}}/M_\ast$\,$\sim$\,0.01--1.48, placing them well above the local $M_{\text{BH}}$--$M_\ast$ relation. In contrast, the host-galaxy size--mass relation broadly agrees with previous measurements. Our results suggest that the host galaxies of these faint AGN are either genuinely under-massive compared to their black hole masses, or too compact to be spatially resolved. |
| title | Undermassive Hosts of $z = 4-6 $ AGN from JWST/NIRCam Image Decomposition with CONGRESS, FRESCO, and JADES |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.15962 |