Andrea Comastri

TL;DR: In this paper, a statistically significant correlation between the Eddington ratio, λ_(Edd), and the X-ray power-law index, Γ, observed in unobscured AGNs offers an estimate of their growth rate.

TL;DR: In this article, the authors define a quasar-galaxy mixing diagram using the slopes of their spectral energy distributions (SEDs) from 1\mu m to 3000AA and from 1/m to 3/m in the rest frame, and find that a combination of the Elvis et al. (1994, hereafter E94) quasar SED with various contributions from galaxy emission and some dust reddening is remarkably effective in describing the SED shape from 0.3-3/m for large ranges of redshift, luminosity, black hole mass and Ed

TL;DR: In this article, the authors investigated whether the presence of a strong Si absorption feature is a good indicator of a heavily obscured active galactic nuclei (hereafter AGN) and found that the majority of the high-τ optically confirmed Seyferts (six out of nine) in the 12 μm sample are probably Compton-thick.

TL;DR: In this paper, X-ray properties of a near-infrared selected (Ks 5) in a region of the Chandra Deep Field-South using the public 1Ms observation were analyzed.

TL;DR: In this article, the authors obtained NuSTAR data of PG1247+267 with the aim of studying its high-energy emission, leveraging the broad band covered by the new NuSTAR and the archival XMM-Newton data.