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The Discovery of a Luminous Broad Absorption Line Quasar at a Redshift of 7.02

Journal
Date Issued
2018
Author(s)
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.
•
•
Green, Richard
•
Jiang, Linhua
•
Hennawi, Joseph F.
•
Huang, Yun-Hsin
•
Mazzucchelli, Chiara
•
McGreer, Ian D.
•
Venemans, Bram
•
Walter, Fabian
•
Beletsky, Yuri
DOI
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 1450 = -27.1 and bolometric luminosity of L Bol = 5.6 × 1013 L ☉, 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-1 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-1, 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.
Volume
869
Issue
1
Start page
L9
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2018ApJ...869L...9W
Rights
open.access
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