JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST
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| Format: | Preprint |
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2025
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| author | Juodžbalis, Ignas Maiolino, Roberto Baker, William M. Lake, Emma Curtis Scholtz, Jan D'Eugenio, Francesco Trefoloni, Bartolomeo Isobe, Yuki Tacchella, Sandro Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Jones, Gareth C. Parlanti, Eleonora Perna, Michele Rinaldi, Pierluigi Robertson, Brant Übler, Hannah Venturi, Giacomo Willott, Chris |
| author_facet | Juodžbalis, Ignas Maiolino, Roberto Baker, William M. Lake, Emma Curtis Scholtz, Jan D'Eugenio, Francesco Trefoloni, Bartolomeo Isobe, Yuki Tacchella, Sandro Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Jones, Gareth C. Parlanti, Eleonora Perna, Michele Rinaldi, Pierluigi Robertson, Brant Übler, Hannah Venturi, Giacomo Willott, Chris |
| contents | The depth and coverage of the first years of JWST observations have revealed low luminosity active galactic nuclei (AGN) across a wide redshift range, shedding light on black hole (BH) assembly and feedback. We present our spectroscopic sample of 34 Type 1 AGN obtained from JADES survey data and spanning $1.5 < z < 9$. Our sample of AGN probes a BH mass range of $10^{6-9}$~M$_{\odot}$ at bolometric luminosities down to $10^{43}$~erg~s$^{-1}$, implying generally sub-Eddington ratios of $<0.5L_{\rm Edd}$. Most of these AGN are hosted in low mass ($M_{\star}\sim10^8$~M$_{\odot}$) galaxies and are overmassive relative to the local $M_{BH}-M_{\star}$ relation, while remaining consistent with the local $M_{BH}$-$σ_*$ relation. The wide redshift range provided by our sample allows us to trace the emergence of local $M_{BH}$-$M_*$ scaling relation across the cosmic epoch. Additionally, we explore the capability of narrow-line diagnostics in identifying Type 2 AGN and find that a significant fraction of our AGN would be missed by them due to low metallicity or lack of high energy ionizing photons (potentially due to dust absorption, dense gas blanketing the broad and narrow line regions, or intrinsically soft ionizing spectra). We explore the UV luminosity function of AGN and their hosts and find that it is subject to significant cosmic variance and is also dependent on the AGN bolometric luminosity. Finally, we show that the electron and Balmer scattering scenarios recently proposed to explain the broad components of the Balmer lines are untenable on multiple grounds. There is no evidence that the black hole masses have been overestimated by orders of magnitude as proposed in those scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_03551 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST Juodžbalis, Ignas Maiolino, Roberto Baker, William M. Lake, Emma Curtis Scholtz, Jan D'Eugenio, Francesco Trefoloni, Bartolomeo Isobe, Yuki Tacchella, Sandro Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Jones, Gareth C. Parlanti, Eleonora Perna, Michele Rinaldi, Pierluigi Robertson, Brant Übler, Hannah Venturi, Giacomo Willott, Chris Astrophysics of Galaxies The depth and coverage of the first years of JWST observations have revealed low luminosity active galactic nuclei (AGN) across a wide redshift range, shedding light on black hole (BH) assembly and feedback. We present our spectroscopic sample of 34 Type 1 AGN obtained from JADES survey data and spanning $1.5 < z < 9$. Our sample of AGN probes a BH mass range of $10^{6-9}$~M$_{\odot}$ at bolometric luminosities down to $10^{43}$~erg~s$^{-1}$, implying generally sub-Eddington ratios of $<0.5L_{\rm Edd}$. Most of these AGN are hosted in low mass ($M_{\star}\sim10^8$~M$_{\odot}$) galaxies and are overmassive relative to the local $M_{BH}-M_{\star}$ relation, while remaining consistent with the local $M_{BH}$-$σ_*$ relation. The wide redshift range provided by our sample allows us to trace the emergence of local $M_{BH}$-$M_*$ scaling relation across the cosmic epoch. Additionally, we explore the capability of narrow-line diagnostics in identifying Type 2 AGN and find that a significant fraction of our AGN would be missed by them due to low metallicity or lack of high energy ionizing photons (potentially due to dust absorption, dense gas blanketing the broad and narrow line regions, or intrinsically soft ionizing spectra). We explore the UV luminosity function of AGN and their hosts and find that it is subject to significant cosmic variance and is also dependent on the AGN bolometric luminosity. Finally, we show that the electron and Balmer scattering scenarios recently proposed to explain the broad components of the Balmer lines are untenable on multiple grounds. There is no evidence that the black hole masses have been overestimated by orders of magnitude as proposed in those scenarios. |
| title | JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.03551 |