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The most luminous blue quasars at . I. A tale of two X-ray populations
E. Nardini, E. Lusso, G. Risaliti +8
(abridged) We present the X-ray analysis of a sample of 30 luminous quasars at with deep XMM-Newton observations, selected from the SDSS-DR7 to be representative o…
Quasars as standard candles II: The non linear relation between UV and X-ray emission at high redshifts
Francesco Salvestrini, Guido Risaliti, Susanna Bisogni +2
A tight non-linear relation between the X-ray and the optical-ultraviolet (UV) emission has been observed in Active Galactic Nuclei (AGN) over a wide range of redshift and several…
Tension with the flat ΛCDM model from a high redshift Hubble Diagram of supernovae, quasars and gamma-ray bursts
E. Lusso, E. Piedipalumbo, G. Risaliti +4
In the current framework, the standard parametrization of our Universe is the so-called Lambda Cold Dark Matter (ΛCDM) model. Recently, Risaliti & Lusso (2019) have shown a ~4σ ten…
Space Telescope and Optical Reverberation Mapping Project. VIII. Time Variability of Emission and Absorption in NGC 5548 Based on Modeling the Ultraviolet Spectrum
G. A. Kriss, G. De Rosa, J. Ely +164
We model the ultraviolet spectra of the Seyfert 1 galaxy NGC~5548 obtained with the Hubble Space Telescope during the 6-month reverberation-mapping campaign in 2014. Our model of t…
Orientation effects on the near-infrared broad band emission of quasars
Susanna Bisogni, Elisabeta Lusso, Alessandro Marconi +1
We recently proposed the equivalent width (EW) of the narrow [OIII]5007Å emission line as an orientation indicator for active galactic nuclei. We tested this method on about $12,30…