Selected Area 57 XMM-Newton X-Ray Source Catalog
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https://b2find.eudat.eu/dataset/a9aaaa82-495d-51d6-b2a2-fc5b4162afae
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The maximum number density of Active Galactic Nuclei (AGNs), as deduced from X-ray studies, occurs at z >= 1, with lower luminosity objects peaking at smaller redshifts....
