789 citations · 5.9k across the 76 of their papers we have counts for
77 papers
A powerful (and likely young) radio-loud quasar at z=5.3
S. Belladitta, A. Moretti, A. Caccianiga +5
We present the discovery of PSO J191.0569686.43172 (hereafter PSO J19186), a new powerful radio-loud quasar (QSO) in the early Universe (z = 5.32). We discovered it by cross-…
Constraining the Radio Properties of the =6.44 QSO VIK J23183113
Luca Ighina, James K. Leung, Jess W. Broderick +19
The recent detection of the quasi-stellar object (QSO) VIKING J231818.3311346 (hereafter VIK J23183113) at redshift in the Rapid ASKAP Continuum Survey (RACS) uncove…
The central engine of the highest redshift blazar
Silvia Belladitta, Alessandro Caccianiga, Alessandro Diana +8
We report on a LUCI/Large Binocular Telescope near-infrared (NIR) spectrum of PSO J030947.49+271757.31 (hereafter PSO J0309+27), the highest redshift blazar known to date (z6…
Direct observation of an extended X-ray jet at =6.1
L. Ighina, A. Moretti, F. Tavecchio +6
We report on the direct observation of an extended X-ray jet in the =6.1 radio-loud Active Galactic Nucleus PSO J030947.49+271757.31 from a deep Chandra X-ray observation (128 k…
Minute-timescale variability in the X-ray emission of the highest redshift blazar
Alberto Moretti, Gabriele Ghisellini, Alessandro Caccianiga +9
We report on two Chandra observations of the quasar PSO J0309+27, the most distant blazar observed so far (z=6.1), performed eight months apart, in March and November 2020. Previou…
The Impact of the CMB on the Evolution of high-z Blazars
L. Ighina, A. Caccianiga, A. Moretti +3
Different works have recently found an increase of the average X-ray-to-radio luminosity ratio with redshift in the blazar population. We evaluate here whether the inverse Compton…