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http://hdl.handle.net/20.500.12386/31266
Title: | Pōniuā'ena: A Luminous z = 7.5 Quasar Hosting a 1.5 Billion Solar Mass Black Hole | Authors: | Yang, Jinyi Wang, Feige Fan, Xiaohui Hennawi, Joseph F. Davies, Frederick B. Yue, Minghao Banados, Eduardo Wu, Xue-Bing Venemans, Bram Barth, Aaron J. Bian, Fuyan Boutsia, Konstantina DECARLI, ROBERTO Farina, Emanuele Paolo Green, Richard Jiang, Linhua Li, Jiang-Tao Mazzucchelli, Chiara Walter, Fabian |
Issue Date: | 2020 | Journal: | THE ASTROPHYSICAL JOURNAL LETTERS | Number: | 897 | Issue: | 1 | First Page: | L14 | Abstract: | We report the discovery of a luminous quasar, J1007+2115 at z = 7.515 ("Pōniuā'ena"), from our wide-field reionization-era quasar survey. J1007+2115 is the second quasar now known at z > 7.5, deep into the reionization epoch. The quasar is powered by a (1.5 ± 0.2) × 10<SUP>9</SUP> M<SUB>⊙</SUB> supermassive black hole (SMBH), based on its broad Mg II emission-line profile from Gemini and Keck near-IR spectroscopy. The SMBH in J1007+2115 is twice as massive as that in quasar J1342+0928 at z = 7.54, the current quasar redshift record holder. The existence of such a massive SMBH just 700 million years after the Big Bang significantly challenges models of the earliest SMBH growth. Model assumptions of Eddington-limited accretion and a radiative efficiency of 0.1 require a seed black hole of ≳10<SUP>4</SUP> M<SUB>⊙</SUB> at z = 30. This requirement suggests either a massive black hole seed as a result of direct collapse or earlier periods of rapid black hole growth with hyper-Eddington accretion and/or a low radiative efficiency. We measure the damping wing signature imprinted by neutral hydrogen absorption in the intergalactic medium (IGM) on J1007+2115's Lyα line profile, and find that it is weaker than that of J1342+0928 and two other z ≳ 7 quasars. We estimate an IGM volume-averaged neutral fraction $\langle {X}_{{\rm{H}}{\rm{I}}}\rangle ={0.39}_{-0.13}^{+0.22}$ . This range of values suggests a patchy reionization history toward different IGM sightlines. We detect the 158 μm [C II] emission line in J1007+2115 with the Atacama Large Millimeter/submillimeter Array; this line centroid yields a systemic redshift of z = 7.5149 ± 0.0004 and indicates a star formation rate of ∼210 M<SUB>⊙</SUB> yr<SUP>-1</SUP> in its host galaxy. | URI: | http://hdl.handle.net/20.500.12386/31266 | URL: | https://iopscience.iop.org/article/10.3847/2041-8213/ab9c26 https://api.elsevier.com/content/abstract/scopus_id/85091393708 |
ISSN: | 2041-8205 | DOI: | 10.3847/2041-8213/ab9c26 | Bibcode ADS: | 2020ApJ...897L..14Y | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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2006.13452.pdf | preprint | 1.14 MB | Adobe PDF | View/Open |
Yang_2020_ApJL_897_L14.pdf | [Administrators only] | 1.54 MB | Adobe PDF |
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