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Title: | Probing the Nature of High-redshift Weak Emission Line Quasars: A Young Quasar with a Starburst Host Galaxy | Authors: | Andika, Irham Taufik Jahnke, Knud Onoue, Masafusa Bañados, Eduardo Mazzucchelli, Chiara Novak, Mladen Eilers, Anna-Christina Venemans, Bram P. Schindler, Jan-Torge Walter, Fabian Neeleman, Marcel Simcoe, Robert A. DECARLI, ROBERTO Farina, Emanuele Paolo Marian, Victor PENSABENE, ANTONIO Cooper, Thomas M. Rojas, Alejandra F. |
Issue Date: | 2020 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 903 | Issue: | 1 | First Page: | 34 | Abstract: | 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 ${M}_{\mathrm{BH}}=\left({2.0}_{-0.4}^{+0.7}\right)\times {10}^{9}$ M<SUB>⊙</SUB> and an Eddington ratio of ${L}_{\mathrm{bol}}/{L}_{\mathrm{Edd}}={0.5}_{-0.2}^{+0.1}$ , 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 ${(\mathrm{Ly}\alpha +{\rm{N}}{\rm\small{V}})}_{\mathrm{rest}}=5.7\pm 0.7\,\mathring{\rm A} $ , EW ${({\rm{C}}{\rm\small{IV}})}_{\mathrm{rest}}\leqslant 5.8$ Š(3σ upper limit), and EW ${(\mathrm{Mg}{\rm\small{II}})}_{\mathrm{rest}}=8.7\pm 0.7\,\mathring{\rm A} $ . A small proximity zone size ( ${R}_{{\rm{p}}}=1.2\pm 0.4$ pMpc) indicates a lifetime of only ${t}_{{\rm{Q}}}={10}^{3.4\pm 0.7}$ years from the last quasar phase ignition. ALMA shows extended [C II] emission with a mild velocity gradient. The inferred far-infrared luminosity ( ${L}_{\mathrm{FIR}}=(1.2\pm 0.1)\times {10}^{13}\,{L}_{\odot }$ ) 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- $4900\,{M}_{\odot }\,{\mathrm{yr}}^{-1}$ , 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. | URI: | http://hdl.handle.net/20.500.12386/30993 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/abb9a6 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/abb9a6 | Bibcode ADS: | 2020ApJ...903...34A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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2009.07784.pdf | postprint | 1.63 MB | Adobe PDF | View/Open |
Andika_2020_ApJ_903_34.pdf | [Administrators only] | 3.72 MB | Adobe PDF |
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