X-ray spectroscopic survey of highly accreting AGN

Improving our understanding of the nuclear properties high-Eddington ratio ($\lambda_\mathrm{Edd}$) active galactic nuclei (AGN) is necessary since bulk X-ray spectroscopic studies have been focused on low-Eddington AGN. We present here spectral analysis 14 radio-quiet, $\lambda_\mathrm{Edd}\gtrsim1$ AGN at $0.4\leq z \leq 0.75$, observed with XMM-Newton. Optical/UV data from simultaneous Optical Monitor observations also considered. These selected to relatively high values black hole mass ($M_\mathrm{BH}\sim10^{8-8.5}M_\odot$) and bolometric luminosity ($L_\mathrm{bol} \sim 10^{46}$ erg s$^{-1}$), in order complement previous lower $M_\mathrm{BH}$ $L_\mathrm{bol}$. studied relation between $\lambda_\mathrm{Edd}$ other key parameters, such as photon index power-law continuum $\Gamma$, correction $k_\mathrm{bol,X}$ $\alpha_\mathrm{ox}$. Despite homogeneous optical SMBH accretion properties, these are quite heterogeneous. measured $\Gamma$ comprised 1.3 2.5, odds expectations based previously reported $\Gamma-\lambda_\mathrm{Edd}$ relations, by which $\Gamma\geq2$ would be an ubiquitous hallmark $\lambda_\mathrm{Edd}\sim1$. found that $\sim30\%$ sources weak, emission about a factor $\sim10-80$ fainter than typical similar UV luminosities. The weakness seems intrinsic not due intervening obscuration. This may indicate commonly undergo periods weakness. Furthermore, results follow-up monitoring Swift one weak suggest can last for several years.