Kavli Affiliate: Roberto Maiolino
| First 5 Authors: Giovanni Mazzolari, Jan Scholtz, Roberto Maiolino, Roberto Gilli, Alberto Traina
| Summary:
In this work, we spectroscopically select narrow-line AGN (NLAGN) among the
$sim 300$ publicly available medium-resolution spectra of the CEERS Survey.
Using both traditional and newly identified emission line NLAGN diagnostics
diagrams, we identified 52 NLAGN at $2lesssim zlesssim 9$ on which we
performed a detailed multiwavelength analysis. We also identified 4 new
$zlesssim 2$ broad-line AGN (BLAGN), in addition to the 8 previously reported
high-$z$ BLAGN. We found that the traditional BPT diagnostic diagrams are not
suited to identify high-$z$ AGN, while most of the high-$z$ NLAGN are selected
using the recently proposed AGN diagnostic diagrams based on the
[OIII]$lambda$4363 auroral line or high-ionization emission lines. We compared
the emission line velocity dispersion and the obscuration of the sample of
NLAGN with those of the parent sample without finding significant differences
between the two distributions, suggesting a population of AGN heavily buried
and not significantly impacting the host galaxies’ physical properties, as
further confirmed by SED-fitting. The bolometric luminosities of the high-$z$
NLAGNs selected in this work are well below those sampled by surveys before
JWST, potentially explaining the weak impact of these AGN. Finally, we
investigate the X-ray properties of the selected NLAGN and of the sample of
high-$z$ BLAGN. We find that all but 4 NLAGN are undetected in the deep X-ray
image of the field, as well as all the high-$z$ BLAGN. We do not obtain a
detection even by stacking the undetected sources, resulting in an X-ray
weakness of $sim 1-2$ dex from what is expected based on their bolometric
luminosities. To discriminate between a heavily obscured AGN scenario or an
intrinsic X-ray weakness of these sources, we performed a radio stacking
analysis, which did not reveal any detection leaving open the questions about
the origin of the X-ray weakness.
| Search Query: ArXiv Query: search_query=au:”Roberto Maiolino”&id_list=&start=0&max_results=3