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Space telescopes Electromagnetic radiation Observational astronomy European Space Agency X-ray astronomy Active galactic nucleus Chandra Deep Field South XMM-Newton X-ray background Astronomy Space X-ray telescopes | Astronomy & Astrophysics A&A 526, L9DOI:Add to Reading ListSource URL: www.aanda.orgDownload Document from Source WebsiteFile Size: 274,35 KBShare Document on Facebook |