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http://hdl.handle.net/20.500.12386/27674
Titolo: | The Discovery of a Luminous Broad Absorption Line Quasar at a Redshift of 7.02 | Autori: | Wang, Feige Yang, Jinyi Fan, Xiaohui Yue, Minghao Wu, Xue-Bing Schindler, Jan-Torge Bian, Fuyan Li, Jiang-Tao Farina, Emanuele P. Bañados, Eduardo Davies, Frederick B. DECARLI, ROBERTO Green, Richard Jiang, Linhua Hennawi, Joseph F. Huang, Yun-Hsin Mazzucchelli, Chiara McGreer, Ian D. Venemans, Bram Walter, Fabian Beletsky, Yuri |
Data pubblicazione: | 2018 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 869 | Fascicolo: | 1 | Da pagina:: | L9 | Abstract: | Despite extensive efforts, to date only two quasars have been found at z > 7, due to a combination of low spatial density and high contamination from more ubiquitous Galactic cool dwarfs in quasar selection. This limits our current knowledge of the super-massive black hole growth mechanism and reionization history. In this Letter, we report the discovery of a luminous quasar at z = 7.021, DELS J003836.10-152723.6 (hereafter J0038-1527), selected using photometric data from Dark Energy Spectroscopic Instrument Legacy Imaging Survey, Pan-STARRS1 (PS1) imaging Survey, as well as Wide-field Infrared Survey Explore mid-infrared all-sky survey. With an absolute magnitude of M <SUB>1450</SUB> = -27.1 and bolometric luminosity of L <SUB>Bol</SUB> = 5.6 × 10<SUP>13</SUP> L <SUB>☉</SUB>, J0038-1527 is the most luminous quasar known at z > 7. Deep optical to near-infrared spectroscopic observations suggest that J0038-1527 hosts a 1.3 billion solar mass black hole accreting at the Eddington limit, with an Eddington ratio of 1.25 ± 0.19. The C IV broad emission line of J0038-1527 is blueshifted by more than 3000 km s<SUP>-1</SUP> relative to the quasar systemic redshift. More detailed investigations of the high-quality spectra reveal three extremely high-velocity C IV broad absorption lines with velocity from 0.08 to 0.14 times the speed of light and total “balnicity” index of more than 5000 km s<SUP>-1</SUP>, suggesting the presence of relativistic outflows. J0038-1527 is the first quasar found at the epoch of reionization with such strong outflows, and therefore provides a unique laboratory to investigate active galactic nuclei feedback on the formation and growth of the most massive galaxies in the early universe. | URI: | http://hdl.handle.net/20.500.12386/27674 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/aaf1d2 | ISSN: | 0004-637X | DOI: | 10.3847/2041-8213/aaf1d2 | Bibcode ADS: | 2018ApJ...869L...9W | Fulltext: | open |
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