activity
20192026
most citedThe space density of z>4 blazars

39 citations · 223 across the 22 of their papers we have counts for

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Showing astro-ph.HEShow all

6 papers · 1 filter

astro-ph.HE2026

The deepest X-ray view of a kiloparsec scale jet at z=6.1

Fabio A. Meanti, Luca Ighina, Alberto Moretti +7

The mechanism responsible for the high-energy emission observed in kiloparsec-scale jets across cosmic time remains poorly understood. The relativistic jet associated with the z=6.…

astro-ph.HE2025★ 3 cited

The Advanced X-ray Imaging Satellite (AXIS) Community Science Book

Michael Koss, Nafisa Aftab, Steven W. Allen +395

The AXIS Community Science Book represents the collective effort of 592 scientists worldwide to define the transformative science enabled by the Advanced X-ray Imaging Satellite (A…

astro-ph.HE2024★ 1 cited

Mapping the Cosmic Gamma-ray Horizon: The 1CGH Catalogue of Fermi-LAT detections above 10 GeV

Bruno Arsioli, Yu-Ling Chang, Luca Ighina

We present the First Cosmic Gamma-ray Horizon (1CGH) catalogue, featuring -ray detections above 10 GeV based on 16 years of observations with the Fermi Large Area Telescope (LAT…

astro-ph.HE2022★ 16 cited

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…

astro-ph.HE2021★ 26 cited

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…

astro-ph.HE2021★ 1 cited

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…