The Large-scale Environments of Low-luminosity AGNs at $3.9 < z < 6$ and Implications for Their Host Dark Matter Halos from a Complete NIRCam Grism Redshift Survey
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| Format: | Preprint |
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2025
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| author | Lin, Xiaojing Fan, Xiaohui Sun, Fengwu Zhang, Junyu Egami, Eiichi Helton, Jakob M. Wang, Feige Zhang, Haowen Bunker, Andrew J. Cai, Zheng Ji, Zhiyuan Jin, Xiangyu Maiolino, Roberto Pudoka, Maria Anne Rinaldi, Pierluigi Robertson, Brant Tacchella, Sandro Tee, Wei Leong Sun, Yang Willmer, Christopher N. A. Willott, Chris Zhu, Yongda |
| author_facet | Lin, Xiaojing Fan, Xiaohui Sun, Fengwu Zhang, Junyu Egami, Eiichi Helton, Jakob M. Wang, Feige Zhang, Haowen Bunker, Andrew J. Cai, Zheng Ji, Zhiyuan Jin, Xiangyu Maiolino, Roberto Pudoka, Maria Anne Rinaldi, Pierluigi Robertson, Brant Tacchella, Sandro Tee, Wei Leong Sun, Yang Willmer, Christopher N. A. Willott, Chris Zhu, Yongda |
| contents | We study the large-scale environments and clustering properties of 28 low-luminosity AGNs at $z=3.9-6$ in the GOODS-N field. Our sample, identified from the JWST NIRCam Imaging and WFSS data in CONGRESS and FRESCO surveys with either broad H$α$ emission lines or V-shape continua, are compared to 782 H$α$ emitters (HAEs) selected from the same data. These AGNs are located in diverse large-scale environments and do not preferentially reside in denser environments compared to HAEs. Their overdensity field, $δ$, averaged over (15 $h^{-1}$cMpc)$^3$, ranges from $-0.56$ to 10.56, and shows no clear correlation with broad-line luminosity, black hole (BH) masses, or the AGN fraction. It suggests that $> 10$ cMpc structures do not significantly influence BH growth. We measure the two-point cross-correlation function of AGNs with HAEs, finding a comparable amplitude to that of the HAE auto-correlation. This indicates similar bias parameters and host dark matter halo masses for AGNs and HAEs. The correlation length of field AGNs is 4.26 $h^{-1}$cMpc, and 7.66 $h^{-1}$cMpc at $3.9 < z < 5$ and $5 < z < 6$, respectively. We infer a median host dark matter halo mass of $\log (M_h/M_\odot)\approx 11.0-11.2$ and host stellar masses of $\log (M_\star/M_\odot) \approx 8.4-8.6$ by comparing with the UniverseMachine simulation. Our clustering analysis suggests that low-luminosity AGNs at high redshift reside in normal star-forming galaxies with overmassive BHs. They represent an intrinsically distinct population from luminous quasars and could be a common phase in galaxy evolution. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_02896 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Large-scale Environments of Low-luminosity AGNs at $3.9 < z < 6$ and Implications for Their Host Dark Matter Halos from a Complete NIRCam Grism Redshift Survey Lin, Xiaojing Fan, Xiaohui Sun, Fengwu Zhang, Junyu Egami, Eiichi Helton, Jakob M. Wang, Feige Zhang, Haowen Bunker, Andrew J. Cai, Zheng Ji, Zhiyuan Jin, Xiangyu Maiolino, Roberto Pudoka, Maria Anne Rinaldi, Pierluigi Robertson, Brant Tacchella, Sandro Tee, Wei Leong Sun, Yang Willmer, Christopher N. A. Willott, Chris Zhu, Yongda Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We study the large-scale environments and clustering properties of 28 low-luminosity AGNs at $z=3.9-6$ in the GOODS-N field. Our sample, identified from the JWST NIRCam Imaging and WFSS data in CONGRESS and FRESCO surveys with either broad H$α$ emission lines or V-shape continua, are compared to 782 H$α$ emitters (HAEs) selected from the same data. These AGNs are located in diverse large-scale environments and do not preferentially reside in denser environments compared to HAEs. Their overdensity field, $δ$, averaged over (15 $h^{-1}$cMpc)$^3$, ranges from $-0.56$ to 10.56, and shows no clear correlation with broad-line luminosity, black hole (BH) masses, or the AGN fraction. It suggests that $> 10$ cMpc structures do not significantly influence BH growth. We measure the two-point cross-correlation function of AGNs with HAEs, finding a comparable amplitude to that of the HAE auto-correlation. This indicates similar bias parameters and host dark matter halo masses for AGNs and HAEs. The correlation length of field AGNs is 4.26 $h^{-1}$cMpc, and 7.66 $h^{-1}$cMpc at $3.9 < z < 5$ and $5 < z < 6$, respectively. We infer a median host dark matter halo mass of $\log (M_h/M_\odot)\approx 11.0-11.2$ and host stellar masses of $\log (M_\star/M_\odot) \approx 8.4-8.6$ by comparing with the UniverseMachine simulation. Our clustering analysis suggests that low-luminosity AGNs at high redshift reside in normal star-forming galaxies with overmassive BHs. They represent an intrinsically distinct population from luminous quasars and could be a common phase in galaxy evolution. |
| title | The Large-scale Environments of Low-luminosity AGNs at $3.9 < z < 6$ and Implications for Their Host Dark Matter Halos from a Complete NIRCam Grism Redshift Survey |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2505.02896 |