So far, roughly 40 quasars with redshifts greater than z = 6 have been discovered1,2,3,4,5,6,7,8. Each quasar contains a black hole with a mass of about one billion solar masses (109 )2,6,7,9,10,11,12,13. The existence of such black holes when the Universe was less than one billion years old presents substantial challenges to theories of the formation and growth of black holes and the coevolution of black holes and galaxies14. Here we report the discovery of an ultraluminous quasar, SDSS J010013.02+280225.8, at redshift z = 6.30. It has an optical and near-infrared luminosity a few times greater than those of previously known z > 6 quasars. On the basis of the deep absorption trough15 on the blue side of the Lyman-α emission line in the spectrum, we estimate the proper size of the ionized proximity zone associated with the quasar to be about 26 million light years, larger than found with other z > 6.1 quasars with lower luminosities16. We estimate (on the basis of a near-infrared spectrum) that the black hole has a mass of ∼1.2 × 1010 , which is consistent with the 1.3 × 1010 derived by assuming an Eddington-limited accretion rate.
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Fan, X. et al. A survey of z > 5.7 quasars in the Sloan Digital Sky Survey. II. Discovery of three additional quasars at z > 6. Astron. J. 125, 1649–1659 (2003)
Jiang, L. et al. Gemini near-infrared spectroscopy of luminous z ∼ 6 quasars: chemical abundances, black hole masses, and Mg II absorption. Astron. J. 134, 1150–1161 (2007)
Willott, C. J. et al. Four quasars above redshift 6 discovered by the Canada-France high-z quasar survey. Astron. J. 134, 2435–2450 (2007)
Jiang, L. et al. A survey of z ∼ 6 quasars in the Sloan Digital Sky Survey deep stripe. I. A flux-limited sample at z AB < 21. Astron. J. 135, 1057–1066 (2008)
Willott, C. J. et al. The Canada-France high-z quasar survey: nine new quasars and the luminosity function at redshift 6. Astron. J. 139, 906–918 (2010)
Mortlock, D. J. et al. A luminous quasar at a redshift of z = 7.085. Nature 474, 616–619 (2011)
Venemans, E. P. et al. Discovery of three z > 6.5 quasars in the VISTA Kilo-Degree Infrared Galaxy (VIKING) Survey. Astrophys. J. 779, 24–36 (2013)
Bañados, E. et al. Discovery of eight z ∼ 6 quasars from Pan-STARRS. Astron. J. 148, 14–25 (2014)
Willott, C. J., McLure, R. J. & Jarvis, M. J. A 3 × 109 black hole in the quasar SDSS J1148+5251 at z = 6.41. Astrophys. J. 587, L15–L18 (2003)
Kurk, J. D. et al. Black hole masses and enrichment of z ∼ 6 SDSS quasars. Astrophys. J. 669, 32–44 (2007)
Willott, C. J. et al. Eddington-limited accretion and the black hole mass function at redshift 6. Astron. J. 140, 546–560 (2010)
De Rosa, G. et al. Evidence for non-evolving Fe II/Mg II ratios in rapidly accreting z ∼ 6 QSOs. Astrophys. J. 739, 56–69 (2011)
De Rosa, G. et al. Black hole mass estimates and emission-line properties of a sample of redshift z >6.5 quasars. Astrophys. J. 790, 145–158 (2014)
Volonteri, M. The formation and evolution of massive black holes. Science 337, 544–547 (2012)
Gunn, J. E. & Peterson, B. A. On the density of neutral hydrogen in intergalactic space. Astrophys. J. 142, 1633–1641 (1965)
Fan, X., Carilli, C. L. & Keating, B. Observational constraints on cosmic reionization. Annu. Rev. Astron. Astrophys. 44, 415–462 (2006)
York, D. G. et al. The Sloan Digital Sky Survey: technical summary. Astron. J. 120, 1579–1587 (2000)
Skrutskie, M. F. et al. The Two Micron All Sky Survey (2MASS). Astron. J. 131, 1163–1183 (2006)
Wright, E. L. et al. The Wide-field Infrared Survey Explorer (WISE): mission description and initial on-orbit performance. Astron. J. 140, 1868–1881 (2010)
Wu, X.-B. et al. SDSS quasars in the WISE preliminary data release and quasar candidate selection with optical/infrared colours. Astron. J. 144, 49–59 (2012)
Shen, Y. et al. A catalog of quasar properties from Sloan Digital Sky Survey data release 7. Astrophys. J. 194 (suppl.). 45–65 (2011)
Fan, X. et al. The discovery of a high-redshift quasar without emission lines from Sloan Digital Sky Survey commissioning data. Astrophys. J. 526, L57–L60 (1999)
Wang, R. et al. Thermal emission from warm dust in the most distant quasars. Astrophys. J. 687, 848–858 (2008)
Vanden Berk, D. E. et al. Composite quasar spectra from the Sloan Digital Sky Survey. Astron. J. 122, 549–564 (2001)
Carilli, C. L. et al. Ionization near zones associated with quasars at z ∼6. Astrophys. J. 714, 834–839 (2010)
McLure, R. J. & Dunlop, J. S. The cosmological evolution of quasar black hole masses. Mon. Not. R. Astron. Soc. 352, 1390–1404 (2004)
Peterson, B. M. et al. Central masses and broad-line region sizes of active galactic nuclei. II. A homogeneous analysis of a large reverberation-mapping database. Astrophys. J. 613, 682–699 (2004)
McConnell, N. J. et al. Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies. Nature 480, 215–218 (2011)
Haiman, Z. et al. Constraining reionization with the evolution of the luminosity function of Lyα emitting galaxies. Astron. J. 623, 627–631 (2005)
Wang, R. et al. Molecular gas in z ∼ 6 quasar host galaxies. Astrophys. J. 714, 699–712 (2010)
Pogge, R. W. et al. The multi-object double spectrographs for the Large Binocular Telescope. Proc. SPIE 7735, 9–16 (2010)
Vestergaard, M. & Wilkes, B. J. An empirical ultraviolet template for iron emission in quasars as derived from I Zwicky 1. Astrophys. J. Suppl. Ser. 134, 1–33 (2001)
Salviander, S. et al. The black hole mass-galaxy bulge relationship for QSOs in the Sloan Digital Sky Survey data release 3. Astrophys. J. 662, 131–144 (2007)
Vestergaard, M. & Osmer, P. S. Mass functions of the active black holes in distant quasars from the Large Bright Quasar Survey, the Bright Quasar Survey, and the color-selected sample of the SDSS Fall Equatorial Stripe. Astrophys. J. 699, 800–816 (2009)
X.-B.W. thanks the NSFC (grant nos 11033001 and 11373008), the Strategic Priority Research Program ‘The Emergence of Cosmological Structures’ of the Chinese Academy of Sciences (grant no. XDB09000000), and the National Key Basic Research Program of China (grant no. 2014CB845700) for support. X.F., R.W. and I.D.M. thank the US NSF (grant nos AST 08-06861 and AST 11-07682) for support. R.W. thanks the NSFC (grant no. 11443002) for support. We acknowledge the support of the staff of the Lijiang 2.4-m telescope. Funding for the telescope was provided by the Chinese Academy of Sciences and the People’s Government of Yunnan Province. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the Strategic Priority Research Program ‘The Emergence of Cosmological Structures’ (grant no. XDB09000000), National Astronomical Observatories, Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance of China. We thank D. Osip for help with Magellan/FIRE spectroscopy, and Y.-L. Ai, L. C. Ho, Y. Shen and J.-G. Wang for suggestions about data analyses. We acknowledge the use of SDSS, 2MASS and WISE data, and of the MMT, LBT, Gemini and Magellan telescopes; detailed acknowledgments of these facilities can be found in Supplementary Information.
The authors declare no competing financial interests.
Extended data figures and tables
J0100+2802 is undetected in SDSS u,g,r bands (top row) but is relatively bright in other bands (lower three rows). It is consistent with a point source in the bands with high signal-to-noise detections. The size is 1′ × 1′ for all images. The green circle represents an angular size of 10″ in each image.
The size is 10″ × 10″. The horizontal and vertical axes denote the offsets in right ascension (ΔRA) and in declination (ΔDec.). The image, with seeing of 0.4″, shows a morphology fully consistent with a point source.
Extended Data Figure 3 The rest-frame spectral energy distributions of J0100+2802, J1148+5251 and ULAS J1120+0641.
The redshifts of these three quasars are 6.30, 6.42 and 7.085, respectively. The luminosity of J0100+2802 in the ultraviolet/optical bands is about four times higher than that of J1148+5251, and seven times higher than that of ULAS J1120+0641. The photometric data are from literature for J1148+5251 and J1120+0641. The error bars show the 1σ standard deviation.
Extended Data Figure 4 The major absorption features identified from optical and near-infrared spectroscopy of J0100+2802.
Most of them are from Mg ii, C iv and Fe ii. The labels from A to H correspond to the redshifts of absorption materials at 6.14, 6.11, 5.32, 5.11, 4.52, 4.22, 3.34 and 2.33, respectively. Studies of intervening and associated absorption systems will be discussed elsewhere.
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Wu, X., Wang, F., Fan, X. et al. An ultraluminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30. Nature 518, 512–515 (2015). https://doi.org/10.1038/nature14241
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