Kavli Affiliate: Roberto Maiolino
| First 5 Authors: Bartolomeo Trefoloni, Bartolomeo Trefoloni, , ,
| Summary:
The James Webb Space Telescope (textitJWST) 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 ($Rsim100$) and the
high-resolution grating ($Rsim2700$) 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 [ionOiii] 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 textitJWST data, we manage
to robustly estimate the black hole mass and the bolometric luminosity, $rm
log(M_BH/(M_odot))=9.2pm 0.2$ and $rm log(L_bol/(erg ,
s^-1))=46.8pm 0.1$, respectively. We derive an Eddington ratio of $rm
lambda_Eddsim 0.4$, challenging the paradigm of widespread super-Eddington
accretion in quasars at the epoch of reionisation.
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