X‐HESS: A large sample of highly accreting serendipitous AGN under the <i>XMM‐Newton</i> microscope
نویسندگان
چکیده
The bulk of X-ray spectroscopic studies active galactic nuclei (AGN) are focused on local ($z < 0.1$) sources with low-to-moderate ($< 0.3$) Eddington ratio ($\lambda_\mathrm{Edd}$). It is then mandatory to overcome this limitation and improve our understanding highly accreting AGN. In work we present the preliminary results from analysis a sample $\sim70$ high-$\lambda_\mathrm{Edd}$ radio-quiet AGN at $0.06 \leq z 3.3$, based 10th release XMM-Newton serendipitous source catalogue, that named as High-Eddington Serendipitous Sample (X-HESS). Almost $\sim35\%$ X-HESS have multi-epoch archival observations $\sim70\%$ can rely simultaneous OM optical data. First reveal showing signatures ultra-fast outflows remarkable long- short-term flux variations. Indeed in J095847.88+690532.7 \sim 1.3$), one most densely monitored objects hosting $\sim$$10^9\,M_\odot$ supermassive black hole, discovered variation soft by factor > 2 over approximately week (rest-frame). Large variations power-law continuum photon index $\Gamma$ also observed, questioning expectations previously reported $\Gamma - \lambda_\mathrm{Edd}$ relations, for which \geq 2$ would be ubiquitous hallmark $\lambda_\mathrm{Edd} 1$.
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 2023
ISSN: ['0004-6337', '1521-3994']
DOI: https://doi.org/10.1002/asna.20230053