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A Significantly Neutral Intergalactic Medium Around the Luminous z = 7 Quasar J0252-0503

The Astrophysical journal, 2020-06, Vol.896 (1), p.23 [Peer Reviewed Journal]

2020. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Jun 01, 2020 ;ISSN: 0004-637X ;EISSN: 1538-4357 ;DOI: 10.3847/1538-4357/ab8c45

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Title:
A Significantly Neutral Intergalactic Medium Around the Luminous z = 7 Quasar J0252-0503
Author: Wang, Feige ; Davies, Frederick B. ; Yang, Jinyi ; Hennawi, Joseph F. ; Fan, Xiaohui ; Barth, Aaron J. ; Jiang, Linhua ; Wu, Xue-Bing ; Mudd, Dale M. ; Bañados, Eduardo ; Bian, Fuyan ; Decarli, Roberto ; Eilers, Anna-Christina ; Farina, Emanuele Paolo ; Venemans, Bram ; Walter, Fabian ; Yue, Minghao
Subjects: Absorption ; Black holes ; Confidence intervals ; Damping ; Deposition ; Early universe ; Hydrogen ; Infrared spectra ; Infrared spectrometers ; Infrared spectroscopy ; Intergalactic media ; Intergalactic medium ; Ionization ; Near infrared radiation ; Near infrared spectroscopy ; Quasar absorption line spectroscopy ; Quasars ; Reionization ; Spectrum analysis ; Supermassive black holes
Is Part Of: The Astrophysical journal, 2020-06, Vol.896 (1), p.23
Description: Luminous z ≥ 7 quasars provide direct probes of the evolution of supermassive black holes (SMBHs) and the intergalactic medium (IGM) during the epoch of reionization (EoR). The Ly damping wing absorption imprinted by neutral hydrogen in the IGM can be detected in a single EoR quasar spectrum, allowing the measurement of the IGM neutral fraction toward that line of sight. However, damping wing features have only been detected in two z > 7 quasars in previous studies. In this paper, we present new high-quality optical and near-infrared spectroscopy of the z = 7.00 quasar DES J025216.64-050331.8 obtained with Keck/Near-Infrared Echellette Spectrometer and Gemini/GMOS. By using the Mg ii single-epoch virial method, we find that it hosts a SMBH accreting at an Eddington ratio of λEdd = 0.7 0.1, consistent with the values seen in other luminous z ∼ 7 quasars. Furthermore, the Ly region of the spectrum exhibits a strong damping wing absorption feature. The lack of associated metal absorption in the quasar spectrum indicates that this absorption is imprinted by a neutral IGM. Using a state-of-the-art model developed by Davies et al., we measure a volume-averaged neutral hydrogen fraction at z = 7 of within 68% (95%) confidence intervals when marginalizing over quasar lifetimes of . This is the highest IGM neutral fraction yet measured using reionization-era quasar spectra.
Publisher: Philadelphia: The American Astronomical Society
Language: English
Identifier: ISSN: 0004-637X
EISSN: 1538-4357
DOI: 10.3847/1538-4357/ab8c45
Source: Alma/SFX Local Collection

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A Significantly Neutral Intergalactic Medium Around the Luminous z = 7 Quasar J0252-0503

2020. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Jun 01, 2020 ;ISSN: 0004-637X ;EISSN: 1538-4357 ;DOI: 10.3847/1538-4357/ab8c45

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