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: | , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2020 October 29
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| 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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| 245 | 1 | 0 | |a Probing the nature of high-redshift weak emission line quasars |b a young quasar with a starburst host galaxy |c 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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| 520 | |a 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. | ||
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