38 citations · 120 across the 11 of their papers we have counts for
11 papers
The most extreme high-z radio quasars in the eRASS:1 X-ray survey
L. Ighina, L. Palmieri, L. N. Martínez-Ramírez +7
We present the selection and identification of high-z radio quasars from a combination of X-ray (eROSITA All-Sky Survey), optical/NIR (DECam Local Volume Exploration), and radio (R…
SKAVLBI view of AGN jets in the early Universe
C. Spingola, M. Mezcua, Y. Liu +33
Active Galactic Nuclei (AGN) are among the brightest sources in the Universe, and those that are also jetted are uniquely valuable at the earliest epochs, because their relativisti…
Milliarcsecond-resolution Radio-imaging Survey of Blazar Candidates at 4 < z < 5.4
Máté Krezinger, Alessandro Caccianiga, Daniele Dallacasa +9
We present a milliarcsecond-resolution radio survey of 17 high-redshift (4 < z < 5.4) blazar candidates observed with the European Very Long Baseline Interferometry (VLBI) Network…
X-ray investigation of possible super-Eddington accretion in a radio-loud quasar at
L. Ighina, A. Caccianiga, T. Connor +19
We present radio and X-ray observations of the recently discovered radio-powerful quasar RACS J032021.44352104.1 using uGMRT, ATCA, LBA, and Chandra. The observed radio…
Flat Spectrum Radio Quasars as high-energy neutrino sources
Alberto Moretti, Alessandro Caccianiga
The astrophysical sources responsible for the production of high-energy neutrinos remain largely uncertain. The strongest associations suggest a correlation between neutrinos and a…
High- radio Quasars in RACS I: Selection, identification, and multi-wavelength properties
L. Ighina, A. Caccianiga, A. Moretti +21
Radio-bright, jetted quasars at serve as unique laboratories for studying supermassive black hole activity in the early Universe. In this work, we present a sample of high-$z…
Multi-wavelength properties of three new radio-powerful quasi-stellar objects discovered from RACS
L. Ighina, A. Caccianiga, A. Moretti +12
We present a multi-wavelength study of three new quasi-stellar objects (QSOs) identified from dedicated spectroscopic observations. The three sources were selected as hi…
Comprehensive view on a radio-loud QSO: from the radio to the optical/NIR to the X-ray band
Luca Ighina, Alessandro Caccianiga, Alberto Moretti +9
We present a multi-wavelength analysis, from the radio to the X-ray band, of the redshift VIK J231831 radio-loud (RL) quasi stellar object (QSO), one of the most distan…
The evolution of the heaviest super-massive black-holes in jetted AGNs
Alessandro Diana, Alessandro Caccianiga, Alberto Moretti +3
We present the space density evolution, from z=1.5 up to z=5.5, of the most massive (MM) black holes hosted in jetted Active Galactic Nuclei(AGNs). The analysis…
X-ray properties of z>4 blazars
L. Ighina, A. Caccianiga, A. Moretti +4
We present the X-ray analysis of the largest flux-limited complete sample of blazar candidates at z>4 selected from the Cosmic Lens All Sky Survey (CLASS). After obtaining a nearly…
Swift data hint at a binary Super Massive Black Hole candidate at sub-parsec separation
P. Severgnini, C. Cicone, R. Della Ceca +10
Dual/binary Supermassive Black Hole (SMBH) systems are the inevitable consequence of the current Lambda Cold Dark Matter cosmological paradigm. In this context, we discuss here the…