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Probing the nature of high-redshift weak emission line quasars: a young quasar with a starburst host galaxy

We present the discovery of PSO J083.8371+11.8482, a weak emission line quasar with extreme star formation rate at z = 6.3401. This quasar was selected from Pan-STARRS1, UHS, and unWISE photometric data. Gemini/GNIRS spectroscopy follow-up indicates a Mg ii-based black hole mass of M ⊙ and an Edding...

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Main Authors: Andika, Irham Taufik (Author) , Jahnke, Knud (Author) , Onoue, Masafusa (Author) , Bañados Torres, Eduardo (Author) , Mazzucchelli, Chiara (Author) , Novak, Mladen (Author) , Eilers, Anna-Christina (Author) , Venemans, Bram P. (Author) , Schindler, Jan-Torge (Author) , Walter, Fabian (Author) , Neeleman, Marcel (Author) , Simcoe, Robert A. (Author) , Decarli, Roberto (Author) , Farina, Emanuele Paolo (Author) , Marian, Victor (Author) , Pensabene, Antonio (Author) , Cooper, Thomas M. (Author) , Rojas, Alejandra F. (Author)
Format: Article (Journal)
Language:English
Published: 2020 October 29
In: The astrophysical journal
Year: 2020, Volume: 903, Issue: 1
ISSN:1538-4357
DOI:10.3847/1538-4357/abb9a6
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4357/abb9a6
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Author Notes:Irham Taufik Andika, Knud Jahnke, Masafusa Onoue, Eduardo Bañados, Chiara Mazzucchelli, Mladen Novak, Anna-Christina Eilers, Bram P. Venemans, Jan-Torge Schindler, Fabian Walter, Marcel Neeleman, Robert A. Simcoe, Roberto Decarli, Emanuele Paolo Farina, Victor Marian, Antonio Pensabene, Thomas M. Cooper, and Alejandra F. Rojas
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Summary:We present the discovery of PSO J083.8371+11.8482, a weak emission line quasar with extreme star formation rate at z = 6.3401. This quasar was selected from Pan-STARRS1, UHS, and unWISE photometric data. Gemini/GNIRS spectroscopy follow-up indicates a Mg ii-based black hole mass of M ⊙ and an Eddington ratio of , in line with an actively accreting supermassive black hole (SMBH) at z ≳ 6. Hubble Space Telescope imaging sets strong constraint on lens boosting, showing no relevant effect on the apparent emission. The quasar is also observed as a pure point source with no additional emission component. The broad-line region (BLR) emission is intrinsically weak and not likely caused by an intervening absorber. We found rest-frame equivalent widths of EW , EW Å (3σ upper limit), and EW . A small proximity zone size ( pMpc) indicates a lifetime of only years from the last quasar phase ignition. ALMA shows extended [C ii] emission with a mild velocity gradient. The inferred far-infrared luminosity () is one of the highest among all known quasar hosts at z ≳ 6. Dust and [C ii] emissions put a constraint on the star formation rate of SFR = 900-, similar to that of a hyperluminous infrared galaxy. Considering the observed quasar lifetime and BLR formation timescale, the weak-line profile in the quasar spectrum is most likely caused by a BLR that is not yet fully formed rather than by continuum boosting by gravitational lensing or a soft continuum due to super-Eddington accretion.
Item Description:Gesehen am 30.11.2020
Physical Description:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/abb9a6

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