The most extreme high- z radio quasars in the eRASS:1 X-ray survey

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ID: 324626
2026
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Abstract
Abstract 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 (Rapid ASKAP Continuum Survey) surveys. After building a sample of 68 new high-z quasar candidates, we performed follow-up spectroscopic observations on 46 sources, confirming 39 to have redshifts z > 3.5. For the subset of radio quasars at z > 4, the 14 new sources identified here represent an increase of ~65% in the known population of objects above the same flux limits in the same area. Using X-ray-to-optical relative intensity, we identified blazars in our sample, which we then used to compare the total number of z > 4, X-ray selected blazars to the predictions of a fractional IC/CMB model previously proposed in the literature. Overall we find a relatively good agreement, even considering the potential biases in the redshift distribution from the incompleteness of the spectroscopic follow-up and the blazar classification criteria. The sources presented in this work represent a sample well suited for investigating the evolution of the most extreme systems in the early Universe, including their relativistic jets and accretion properties.
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openalex_W7202172545 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors L Ighina, L Palmieri, L N Martínez-Ramírez, A Caccianiga, T Connor, A Moretti, B. Arsioli, Y Beletsky, E Marini, A. Rossi
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1518
URL
https://doi.org/10.1093/mnras/stag1518
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