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- Title
X‐HESS: A large sample of highly accreting serendipitous AGN under the XMM‐Newton microscope.
- Authors
Laurenti, M.; Tombesi, F.; Vagnetti, F.; Piconcelli, E.; Guainazzi, M.; Middei, R.
- Abstract
The bulk of X‐ray spectroscopic studies of active galactic nuclei (AGN) are focused on local (z<0.1$$ z<0.1 $$) sources with low‐to‐moderate (<0.3) Eddington ratio (λEdd$$ {\lambda}_{\mathrm{Edd}} $$). It is then mandatory to overcome this limitation and improve our understanding of highly accreting AGN. In this work, we present the preliminary results from the analysis of a sample of ∼70$$ \sim 70 $$ high‐λEdd$$ {\lambda}_{\mathrm{Edd}} $$ radio‐quiet AGN at 0.06≤z≤3.3$$ 0.06\le z\le 3.3 $$, based on the 10th release of the XMM‐Newton serendipitous source catalog, that we named as XMM‐Newton High‐Eddington Serendipitous AGN Sample (X‐HESS). Almost ∼35%$$ \sim 35\% $$ of the X‐HESS AGN have multi‐epoch archival observations and ∼70%$$ \sim 70\% $$ of the sources can rely on simultaneous OM optical data. First results reveal sources showing signatures of ultra‐fast outflows and remarkable long‐ and short‐term X‐ray flux variations. Indeed in SDSS J095847.88+690532.7 (z∼1.3$$ z\sim 1.3 $$), one of the most densely monitored objects hosting a ∼109 M⊙$$ \sim 1{0}^9\;{M}_{\odot } $$ supermassive black hole, we discovered a variation of the soft X‐ray flux by a factor of >2 over approximately one week (rest‐frame). Large variations in the power‐law continuum photon index Γ$$ \Gamma $$ are also observed, questioning expectations from previously reported Γ−λEdd$$ \Gamma -{\lambda}_{\mathrm{Edd}} $$ relations, for which Γ≥2$$ \Gamma \ge 2 $$ would be a ubiquitous hallmark of AGN with λEdd∼1$$ {\lambda}_{\mathrm{Edd}}\sim 1 $$.
- Subjects
SUPERMASSIVE black holes; ACTIVE galactic nuclei; SOFT X rays; MICROSCOPES; ACTIVE galaxies
- Publication
Astronomische Nachrichten, 2023, Vol 344, Issue 4, p1
- ISSN
0004-6337
- Publication type
Article
- DOI
10.1002/asna.20230053