2021/01/08 by Feige Wang, Jinyi Yang, Xiaohui Fan +20 · 2 voices · 2 citations
Physics and Astronomy · #astro-ph.GA
paper · pdf · doi:10.3847/2041-8213/abd8c6
4 figures, 1 table; accepted for publication in ApJL
arxiv created 2021/01/08 · arxiv published 2021/01/08 · arxiv updated 2021/01/27
Distant quasars are unique tracers to study the formation of the earliest supermassive black holes (SMBHs) and the history of cosmic reionization. Despite extensive efforts, only two quasars have been found at z≥7.5, due to a combination of their low spatial density and the high contamination rate in quasar selection. We report the discovery of a luminous quasar at z=7.642, J0313-1806, the most distant quasar yet known. This quasar has a bolometric luminosity of 3.6×1013 L_\odot. Deep spectroscopic observations reveal a SMBH with a mass of (1.6±0.4) ×109M_\odot in this quasar. The existence of such a massive SMBH just ∼670 million years after the Big Bang challenges significantly theoretical models of SMBH growth. In addition, the quasar spectrum exhibits strong broad absorption line (BAL) features in CIV and SiIV, with a maximum velocity close to 20% of the speed of light. The relativistic BAL features, combined with a strongly blueshifted CIV emission line, indicate that there is a strong active galactic nucleus (AGN) driven outflow in this system. ALMA observations detect the dust continuum and [CII] emission from the quasar host galaxy, yielding an accurate redshift of 7.6423 ± 0.0013 and suggesting that the quasar is hosted by an intensely star-forming galaxy, with a star formation rate of \rm∼ 200 ~M_\odot ~yr-1 and a dust mass of ∼7×107~M_\odot. Followup observations of this reionization-era BAL quasar will provide a powerful probe of the effects of AGN feedback on the growth of the earliest massive galaxies.