articleThe Astrophysical Journal LettersOct 26, 2023GOLD OA

UNCOVER: A NIRSpec Identification of a Broad-line AGN at z = 8.50

VKVasily KokorevSFSeiji FujimotoILIvo LabbéJEJenny E. GreeneRBRachel Bezanson

University of Groningen · Netherlands Institute for Radio Astronomy · +25 more institutions

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Abstract

Abstract Deep observations with the James Webb Space Telescope (JWST) have revealed an emerging population of red pointlike sources that could provide a link between the postulated supermassive black hole seeds and observed quasars. In this work, we present a JWST/NIRSpec spectrum from the JWST Cycle 1 UNCOVER Treasury survey of a massive accreting black hole at z = 8.50 displaying a clear broad-line component as inferred from the H β line with FWHM = 3439 ± 413 km s −1 , typical of the broad-line region of an active galactic nucleus (AGN). The AGN nature of this object is further supported by high ionization, as inferred from emission lines, and a point-source morphology. We compute a black hole mass of…

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