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Extragalactic astronomy Emission spectroscopy Seyfert galaxy Supermassive black holes Active galactic nucleus Spectral line Quasar Accretion disc Black holes Astronomy Physics | Astronomy & Astrophysics A&A 551, L6[removed]DOI: [removed][removed]Add to Reading ListSource URL: www.aanda.orgDownload Document from Source WebsiteFile Size: 135,04 KBShare Document on Facebook |