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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2509.07064 |
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| _version_ | 1866916940349440000 |
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| author | Trefoloni, Bartolomeo Carniani, Stefano Bertola, Elena Venturi, Giacomo Zamora, Sandra Parlanti, Eleonora Arribas, Santiago Bunker, Andrew Charlot, Stéphane D'Eugenio, Francesco Jakobsen, Peter Maiolino, Roberto Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris J. Böker, Torsten Cresci, Giovanni Lamperti, Isabella Marshall, Madeline Pérez-González, Pablo G. |
| author_facet | Trefoloni, Bartolomeo Carniani, Stefano Bertola, Elena Venturi, Giacomo Zamora, Sandra Parlanti, Eleonora Arribas, Santiago Bunker, Andrew Charlot, Stéphane D'Eugenio, Francesco Jakobsen, Peter Maiolino, Roberto Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris J. Böker, Torsten Cresci, Giovanni Lamperti, Isabella Marshall, Madeline Pérez-González, Pablo G. |
| contents | The James Webb Space Telescope (\textit{JWST}) opened a new observational window on the primordial Universe. Here we present new JWST NIRSpec integral field spectroscopy (IFS) observations of the $z=7.54$ quasar ULAS J1342+0928 obtained as part of the Galaxy Assembly with NIRSpec IFS (GA-NIFS) GTO programme. The new data-set obtained with both the prism ($R\sim100$) and the high-resolution grating ($R\sim2700$) allow for a complete description of the quasar emission from the rest-frame UV to optical bands. The low-resolution data reveal the presence of [\ion{O}{iii}] emission on $\sim$7 kpc scales, well above the typical galaxy size at this redshift, likely associated with a past outflow event. Additionally, the high-resolution observations show a more energetic ionised outflow on nuclear scales ($\lesssim 0.6$ kpc). The total ionised mass outflow rate ranges between 50 and 300 $\rm M_{\odot} \, yr^{-1}$ where the significant spread is mostly due to the lack of tight constraints on the electron density. This range overlaps in part with the star formation rate range (85--545 $\rm M_{\odot} \, yr^{-1}$), implying that the nuclear outflow could ultimately lead to an early star formation quenching. By employing an accretion disc modelling, for the first time on \textit{JWST} data, we manage to robustly estimate the black hole mass and the bolometric luminosity, $\rm \log(M_{BH}/(M_{\odot}))=9.2\pm 0.2$ and $\rm \log(L_{bol}/(erg \, s^{-1}))=46.8\pm 0.1$, respectively. We derive an Eddington ratio of $\rm λ_{Edd}\sim 0.4$, challenging the paradigm of widespread super-Eddington accretion in quasars at the epoch of reionisation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_07064 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | GA-NIFS: an extended [OIII] halo around the sub-Eddington quasar J1342+0928 at z=7.54 Trefoloni, Bartolomeo Carniani, Stefano Bertola, Elena Venturi, Giacomo Zamora, Sandra Parlanti, Eleonora Arribas, Santiago Bunker, Andrew Charlot, Stéphane D'Eugenio, Francesco Jakobsen, Peter Maiolino, Roberto Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris J. Böker, Torsten Cresci, Giovanni Lamperti, Isabella Marshall, Madeline Pérez-González, Pablo G. Astrophysics of Galaxies The James Webb Space Telescope (\textit{JWST}) opened a new observational window on the primordial Universe. Here we present new JWST NIRSpec integral field spectroscopy (IFS) observations of the $z=7.54$ quasar ULAS J1342+0928 obtained as part of the Galaxy Assembly with NIRSpec IFS (GA-NIFS) GTO programme. The new data-set obtained with both the prism ($R\sim100$) and the high-resolution grating ($R\sim2700$) allow for a complete description of the quasar emission from the rest-frame UV to optical bands. The low-resolution data reveal the presence of [\ion{O}{iii}] emission on $\sim$7 kpc scales, well above the typical galaxy size at this redshift, likely associated with a past outflow event. Additionally, the high-resolution observations show a more energetic ionised outflow on nuclear scales ($\lesssim 0.6$ kpc). The total ionised mass outflow rate ranges between 50 and 300 $\rm M_{\odot} \, yr^{-1}$ where the significant spread is mostly due to the lack of tight constraints on the electron density. This range overlaps in part with the star formation rate range (85--545 $\rm M_{\odot} \, yr^{-1}$), implying that the nuclear outflow could ultimately lead to an early star formation quenching. By employing an accretion disc modelling, for the first time on \textit{JWST} data, we manage to robustly estimate the black hole mass and the bolometric luminosity, $\rm \log(M_{BH}/(M_{\odot}))=9.2\pm 0.2$ and $\rm \log(L_{bol}/(erg \, s^{-1}))=46.8\pm 0.1$, respectively. We derive an Eddington ratio of $\rm λ_{Edd}\sim 0.4$, challenging the paradigm of widespread super-Eddington accretion in quasars at the epoch of reionisation. |
| title | GA-NIFS: an extended [OIII] halo around the sub-Eddington quasar J1342+0928 at z=7.54 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.07064 |