417 citations · 8.4k across the 123 of their papers we have counts for
11 papers · 1 filter
The WISSH quasars project XI. The mean Spectral Energy Distribution and Bolometric Corrections of the most luminous quasars
Ivano Saccheo, Angela Bongiorno, Enrico Piconcelli +18
Hyper-luminous Quasi-Stellar Objects (QSOs) represent the ideal laboratory to investigate Active Galactic Nuclei (AGN) feedback mechanism since their formidable energy release caus…
Hands-on learning at a world-class telescope
Elisabeta Lusso, Lapo Casetti, Maurizio Pancrazzi +1
For the first time, an Italian University has the possibility to perform a multi-year observing campaign at a world-class telescope. This hands-on experience had a significant impa…
The optically elusive, changing-look active nucleus in NGC 4156
Giulia Tozzi, Elisabeta Lusso, Lapo Casetti +21
We report on the changing-look nature of the active galactic nucleus (AGN) in the galaxy NGC 4156, as serendipitously discovered thanks to data acquired in 2019 at the Telescopio N…
The SOUX AGN sample: Optical/UV/X-ray SEDs and the nature of the disc
Jake A. J. Mitchell, Chris Done, Martin J. Ward +4
We use the SOUX sample of 700 AGN to form average optical-UV-X-rays SEDs on a 2D grid of and . We compare these with the predictions of a new AGN…
Quasars as high-redshift standard candles
A. Sacchi, G. Risaliti, M. Signorini +10
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used to derive quasar distances and to build a Hubble diagram at redshifts up to $z\si…
Constraining the Size of the Circumgalactic Medium Using the Transverse Autocorrelation Function of C IV Absorbers in Paired Quasar Spectra
Abby Mintz, Marc Rafelski, Regina A. Jorgenson +6
The circumgalactic medium (CGM) plays a vital role in the formation and evolution of galaxies, acting as a lifeline between galaxies and the surrounding intergalactic medium (IGM).…
The Dawn of Black Holes
Elisabeta Lusso, Rosa Valiante, Fabio Vito
In the last decades, luminous accreting super-massive black holes have been discovered within the first Gyr after the Big Bang, but their origin is still an unsolved mystery. We di…
A radio, optical, UV and X-ray view of the enigmatic changing look Active Galactic Nucleus 1ES~1927+654 from its pre- to post-flare states
Sibasish Laha, Eileen Meyer, Agniva Roychowdhury +17
The nearby type-II AGN 1ES1927+654 went through a violent changing-look (CL) event beginning December 2017 during which the optical and UV fluxes increased by four magnitudes over…
Unveiling the population of dual- and lensed- AGNs at sub-arcsec separations
Filippo Mannucci, Elena Pancino, Francesco Belfiore +12
All cosmological models of structure formation predict the existence of a widespread population of dual supermassive black holes in-spiralling inside their common host galaxy, even…
Unveiling the Universe with Emerging Cosmological Probes
Michele Moresco, Lorenzo Amati, Luca Amendola +22
The detection of the accelerated expansion of the Universe has been one of the major breakthroughs in modern cosmology. Several cosmological probes (CMB, SNe Ia, BAO) have been stu…
Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter
V. A. Fawcett, D. M. Alexander, D. J. Rosario +4
We have recently found fundamental differences in the radio properties of red quasars when compared to typical blue quasars. In this paper we use X-shooter data, providing spectral…