skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7

Abstract

During reionization, neutral hydrogen in the intergalactic medium (IGM) imprints a damping wing absorption feature on the spectrum of high-redshift quasars. A detection of this signature provides compelling evidence for a significantly neutral universe, and enables measurements of the hydrogen neutral fraction x HI(z) at that epoch. Obtaining reliable quantitative constraints from this technique, however, is challenging due to stochasticity induced by the patchy inside-out topology of reionization, degeneracies with quasar lifetime, and the unknown unabsorbed quasar spectrum close to rest-frame Lyα. Here, we combine a large-volume semi-numerical simulation of reionization topology with 1D radiative transfer through high-resolution hydrodynamical simulations of the high-redshift universe to construct models of quasar transmission spectra during reionization. Our state-of-the-art approach captures the distribution of damping wing strengths in biased quasar halos that should have reionized earlier, as well as the erosion of neutral gas in the quasar environment caused by its own ionizing radiation. Combining this detailed model with our new technique for predicting the quasar continuum and its associated uncertainty, we introduce a Bayesian statistical method to jointly constrain the neutral fraction of the universe and the quasar lifetime from individual quasar spectra. We apply this methodology to the spectra of the two quasars with the highest redshifts known, ULAS J1120+0641 and ULAS J1342+0928, and measure volume-averaged neutral fractions {x HI}(Z = 7.09) = 0.48 $$+0.26\atop{-0.26}$$and {x HI}(Z = 7.54) = 0.60 $$+0.20\atop{-0.23}$$ (posterior medians and 68% credible intervals) when marginalized over quasar lifetimes of 10 3 ≤ t q ≤ 10 8 yr.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [1]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [7]; ORCiD logo [8]
  1. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
  2. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics; Max Planck Inst. für Astronomie, Heidelberg (Germany)
  3. Observatories of the Carnegie Inst. for Science, Pasadena, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Max Planck Inst. für Astronomie, Heidelberg (Germany)
  6. Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
  7. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics; Peking Univ., Beijing (China). Dept. of Astronomy, School of Physics, Kavli Inst. for Astronomy and Astrophysics
  8. Univ. of Arizona, Tucson, AZ (United States). Steward Observatory; Peking Univ., Beijing (China). Dept. of Astronomy, School of Physics, Kavli Inst. for Astronomy and Astrophysics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1493262
Grant/Contract Number:  
[AC02-05CH11231]
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
[Journal Name: The Astrophysical Journal (Online); Journal Volume: 864; Journal Issue: 2]; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology: observations; cosmology: theory; dark ages, reionization, first stars; intergalactic medium; quasars: absorption lines

Citation Formats

Davies, Frederick B., Hennawi, Joseph F., Bañados, Eduardo, Lukić, Zarija, Decarli, Roberto, Fan, Xiaohui, Farina, Emanuele P., Mazzucchelli, Chiara, Rix, Hans-Walter, Venemans, Bram P., Walter, Fabian, Wang, Feige, and Yang, Jinyi. Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aad6dc.
Davies, Frederick B., Hennawi, Joseph F., Bañados, Eduardo, Lukić, Zarija, Decarli, Roberto, Fan, Xiaohui, Farina, Emanuele P., Mazzucchelli, Chiara, Rix, Hans-Walter, Venemans, Bram P., Walter, Fabian, Wang, Feige, & Yang, Jinyi. Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7. United States. doi:10.3847/1538-4357/aad6dc.
Davies, Frederick B., Hennawi, Joseph F., Bañados, Eduardo, Lukić, Zarija, Decarli, Roberto, Fan, Xiaohui, Farina, Emanuele P., Mazzucchelli, Chiara, Rix, Hans-Walter, Venemans, Bram P., Walter, Fabian, Wang, Feige, and Yang, Jinyi. Mon . "Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7". United States. doi:10.3847/1538-4357/aad6dc. https://www.osti.gov/servlets/purl/1493262.
@article{osti_1493262,
title = {Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7},
author = {Davies, Frederick B. and Hennawi, Joseph F. and Bañados, Eduardo and Lukić, Zarija and Decarli, Roberto and Fan, Xiaohui and Farina, Emanuele P. and Mazzucchelli, Chiara and Rix, Hans-Walter and Venemans, Bram P. and Walter, Fabian and Wang, Feige and Yang, Jinyi},
abstractNote = {During reionization, neutral hydrogen in the intergalactic medium (IGM) imprints a damping wing absorption feature on the spectrum of high-redshift quasars. A detection of this signature provides compelling evidence for a significantly neutral universe, and enables measurements of the hydrogen neutral fraction x HI(z) at that epoch. Obtaining reliable quantitative constraints from this technique, however, is challenging due to stochasticity induced by the patchy inside-out topology of reionization, degeneracies with quasar lifetime, and the unknown unabsorbed quasar spectrum close to rest-frame Lyα. Here, we combine a large-volume semi-numerical simulation of reionization topology with 1D radiative transfer through high-resolution hydrodynamical simulations of the high-redshift universe to construct models of quasar transmission spectra during reionization. Our state-of-the-art approach captures the distribution of damping wing strengths in biased quasar halos that should have reionized earlier, as well as the erosion of neutral gas in the quasar environment caused by its own ionizing radiation. Combining this detailed model with our new technique for predicting the quasar continuum and its associated uncertainty, we introduce a Bayesian statistical method to jointly constrain the neutral fraction of the universe and the quasar lifetime from individual quasar spectra. We apply this methodology to the spectra of the two quasars with the highest redshifts known, ULAS J1120+0641 and ULAS J1342+0928, and measure volume-averaged neutral fractions {xHI}(Z = 7.09) = 0.48 $+0.26\atop{-0.26}$and {xHI}(Z = 7.54) = 0.60 $+0.20\atop{-0.23}$ (posterior medians and 68% credible intervals) when marginalized over quasar lifetimes of 103 ≤ t q ≤ 108 yr.},
doi = {10.3847/1538-4357/aad6dc},
journal = {The Astrophysical Journal (Online)},
number = [2],
volume = [864],
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Probing the Universe with the Ly  forest -- I. Hydrodynamics of the low-density intergalactic medium
journal, May 1998


A new Method to Directly Measure the Jeans Scale of the Intergalactic Medium Using Close Quasar Pairs
journal, September 2013


Merger rates in hierarchical models of galaxy formation
journal, June 1993

  • Lacey, C.; Cole, S.
  • Monthly Notices of the Royal Astronomical Society, Vol. 262, Issue 3
  • DOI: 10.1093/mnras/262.3.627

Radiative Transfer in a Clumpy Universe. iv. new Synthesis Models of the Cosmic Uv/X-Ray Background
journal, February 2012


A New Method to Measure the Post-reionization Ionizing Background from the Joint Distribution of Ly α and Ly β Forest Transmission
journal, March 2018

  • Davies, Frederick B.; Hennawi, Joseph F.; Eilers, Anna-Christina
  • The Astrophysical Journal, Vol. 855, Issue 2
  • DOI: 10.3847/1538-4357/aaaf70

DISCOVERY OF THREE z > 6.5 QUASARS IN THE VISTA KILO-DEGREE INFRARED GALAXY (VIKING) SURVEY
journal, November 2013


The nature and evolution of the highly ionized near-zones in the absorption spectra of z = 6 quasars
journal, January 2007


The redshift evolution of escape fraction of hydrogen ionizing photons from galaxies
journal, February 2016

  • Khaire, Vikram; Srianand, Raghunathan; Choudhury, Tirthankar Roy
  • Monthly Notices of the Royal Astronomical Society, Vol. 457, Issue 4
  • DOI: 10.1093/mnras/stw192

Copious Amounts of Dust and Gas in a z = 7.5 Quasar Host Galaxy
journal, December 2017

  • Venemans, Bram P.; Walter, Fabian; Decarli, Roberto
  • The Astrophysical Journal, Vol. 851, Issue 1
  • DOI: 10.3847/2041-8213/aa943a

Lyα emission-line reconstruction for high- z QSOs
journal, December 2016

  • Greig, Bradley; Mesinger, Andrei; McGreer, Ian D.
  • Monthly Notices of the Royal Astronomical Society, Vol. 466, Issue 2
  • DOI: 10.1093/mnras/stw3210

Modeling the He ii Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration
journal, July 2018

  • Schmidt, Tobias M.; Hennawi, Joseph F.; Worseck, Gábor
  • The Astrophysical Journal, Vol. 861, Issue 2
  • DOI: 10.3847/1538-4357/aac8e4

The Evolution Of 21 cm Structure (EOS): public, large-scale simulations of Cosmic Dawn and reionization
journal, April 2016

  • Mesinger, Andrei; Greig, Bradley; Sobacchi, Emanuele
  • Monthly Notices of the Royal Astronomical Society, Vol. 459, Issue 3
  • DOI: 10.1093/mnras/stw831

The Rest‐Frame Extreme‐Ultraviolet Spectral Properties of Quasi‐stellar Objects
journal, February 2002

  • Telfer, Randal C.; Zheng, Wei; Kriss, Gerard A.
  • The Astrophysical Journal, Vol. 565, Issue 2
  • DOI: 10.1086/324689

The Giant Gemini GMOS survey of zem > 4.4 quasars – I. Measuring the mean free path across cosmic time
journal, October 2014

  • Worseck, Gábor; Prochaska, J. Xavier; O'Meara, John M.
  • Monthly Notices of the Royal Astronomical Society, Vol. 445, Issue 2
  • DOI: 10.1093/mnras/stu1827

Eight new luminous z ≥ 6 quasars discovered via SED model fitting of VISTA, WISE and Dark Energy Survey Year 1 observations
journal, March 2017

  • Reed, S. L.; McMahon, R. G.; Martini, P.
  • Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 4
  • DOI: 10.1093/mnras/stx728

A Fundamental Test for Galaxy Formation Models: Matching the Lyman- α Absorption Profiles of Galactic Halos Over Three Decades in Distance
journal, May 2018

  • Sorini, Daniele; Oñorbe, José; Hennawi, Joseph F.
  • The Astrophysical Journal, Vol. 859, Issue 2
  • DOI: 10.3847/1538-4357/aabb52

COSMIC REIONIZATION AND EARLY STAR-FORMING GALAXIES: A JOINT ANALYSIS OF NEW CONSTRAINTS FROM PLANCK AND THE HUBBLE SPACE TELESCOPE
journal, April 2015

  • Robertson, Brant E.; Ellis, Richard S.; Furlanetto, Steven R.
  • The Astrophysical Journal, Vol. 802, Issue 2
  • DOI: 10.1088/2041-8205/802/2/L19

Model-independent evidence in favour of an end to reionization by z ≈ 6
journal, December 2014

  • McGreer, Ian D.; Mesinger, Andrei; D'Odorico, Valentina
  • Monthly Notices of the Royal Astronomical Society, Vol. 447, Issue 1
  • DOI: 10.1093/mnras/stu2449

Implications of z ∼ 6 Quasar Proximity Zones for the Epoch of Reionization and Quasar Lifetimes
journal, May 2017

  • Eilers, Anna-Christina; Davies, Frederick B.; Hennawi, Joseph F.
  • The Astrophysical Journal, Vol. 840, Issue 1
  • DOI: 10.3847/1538-4357/aa6c60

Statistical Detection of the He ii Transverse Proximity Effect: Evidence for Sustained Quasar Activity for >25 Million Years
journal, September 2017

  • Schmidt, Tobias M.; Worseck, Gabor; Hennawi, Joseph F.
  • The Astrophysical Journal, Vol. 847, Issue 1
  • DOI: 10.3847/1538-4357/aa83ac

The UKIRT Infrared Deep Sky Survey (UKIDSS)
journal, August 2007


The Compact, ∼1 kpc Host Galaxy of a Quasar at a Redshift of 7.1
journal, March 2017

  • Venemans, Bram P.; Walter, Fabian; Decarli, Roberto
  • The Astrophysical Journal, Vol. 837, Issue 2
  • DOI: 10.3847/1538-4357/aa62ac

Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z  ~ 6 Quasars. II. A Sample of 19 Quasars
journal, June 2006

  • Fan, Xiaohui; Strauss, Michael A.; Becker, Robert H.
  • The Astronomical Journal, Vol. 132, Issue 1
  • DOI: 10.1086/504836

THE PAN-STARRS1 DISTANT z > 5.6 QUASAR SURVEY: MORE THAN 100 QUASARS WITHIN THE FIRST GYR OF THE UNIVERSE
journal, November 2016

  • Bañados, E.; Venemans, B. P.; Decarli, R.
  • The Astrophysical Journal Supplement Series, Vol. 227, Issue 1
  • DOI: 10.3847/0067-0049/227/1/11

On the Density of Neutral Hydrogen in Intergalactic Space.
journal, November 1965

  • Gunn, James E.; Peterson, Bruce A.
  • The Astrophysical Journal, Vol. 142
  • DOI: 10.1086/148444

Probing the Ionization State of the Universe at z >6
journal, July 2003

  • White, Richard L.; Becker, Robert H.; Fan, Xiaohui
  • The Astronomical Journal, Vol. 126, Issue 1
  • DOI: 10.1086/375547

The UKIRT Hemisphere Survey: definition and J-band data release
journal, October 2017

  • Dye, S.; Lawrence, A.; Read, M. A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 473, Issue 4
  • DOI: 10.1093/mnras/stx2622

21cmfast: a fast, seminumerical simulation of the high-redshift 21-cm signal: 21cmfast
journal, November 2010


An unbiased measurement of the UV background and its evolution via the proximity effect in quasar spectra
journal, October 2008


The Universe Is Reionizing at z ∼ 7: Bayesian Inference of the IGM Neutral Fraction Using Ly α Emission from Galaxies
journal, March 2018

  • Mason, Charlotte A.; Treu, Tommaso; Dijkstra, Mark
  • The Astrophysical Journal, Vol. 856, Issue 1
  • DOI: 10.3847/1538-4357/aab0a7

Quasar Proximity Zones and Patchy Reionization
journal, November 2007

  • Lidz, Adam; McQuinn, Matthew; Zaldarriaga, Matias
  • The Astrophysical Journal, Vol. 670, Issue 1
  • DOI: 10.1086/521974

Predicting QSO Continua in the Lyα Forest
journal, January 2005

  • Suzuki, Nao; Tytler, David; Kirkman, David
  • The Astrophysical Journal, Vol. 618, Issue 2
  • DOI: 10.1086/426062

Evidence for Reionization at [ITAL][CLC]z[/CLC][/ITAL] ∼ 6: Detection of a Gunn-Peterson Trough in a [ITAL][CLC]z[/CLC][/ITAL] = 6.28 Quasar
journal, December 2001

  • Becker, Robert H.; Fan, Xiaohui; White, Richard L.
  • The Astronomical Journal, Vol. 122, Issue 6
  • DOI: 10.1086/324231

The first ultraviolet quasar-stacked spectrum at z ≃ 2.4 from WFC3
journal, April 2015

  • Lusso, E.; Worseck, G.; Hennawi, J. F.
  • Monthly Notices of the Royal Astronomical Society, Vol. 449, Issue 4
  • DOI: 10.1093/mnras/stv516

A luminous quasar at a redshift of z = 7.085
journal, June 2011

  • Mortlock, Daniel J.; Warren, Stephen J.; Venemans, Bram P.
  • Nature, Vol. 474, Issue 7353
  • DOI: 10.1038/nature10159

A high-resolution study of the absorption spectrum of PKS 2126-158
journal, May 1979

  • Young, P. J.; Sargent, W. L. W.; Boksenberg, A.
  • The Astrophysical Journal, Vol. 229
  • DOI: 10.1086/157024

Reionization of the Intergalactic Medium and the Damping Wing of the Gunn‐Peterson Trough
journal, July 1998

  • Miralda‐Escude, Jordi
  • The Astrophysical Journal, Vol. 501, Issue 1
  • DOI: 10.1086/305799

Cosmology at low frequencies: The 21cm transition and the high-redshift Universe
journal, October 2006


HST -COS OBSERVATIONS OF AGNs. II. EXTENDED SURVEY OF ULTRAVIOLET COMPOSITE SPECTRA FROM 159 ACTIVE GALACTIC NUCLEI
journal, September 2014

  • Stevans, Matthew L.; Shull, J. Michael; Danforth, Charles W.
  • The Astrophysical Journal, Vol. 794, Issue 1
  • DOI: 10.1088/0004-637X/794/1/75

Indirect inference
journal, December 1993

  • Gourieroux, C.; Monfort, A.; Renault, E.
  • Journal of Applied Econometrics, Vol. 8, Issue S1
  • DOI: 10.1002/jae.3950080507

Quasar H II regions during cosmic reionization
journal, September 2007


UV LUMINOSITY FUNCTIONS AT REDSHIFTS z ∼ 4 TO z ∼ 10: 10,000 GALAXIES FROM HST LEGACY FIELDS
journal, April 2015


Quasar Strömgren Spheres Before Cosmological Reionization
journal, October 2000

  • Cen, Renyue; Haiman, Zoltan
  • The Astrophysical Journal, Vol. 542, Issue 2
  • DOI: 10.1086/312937

Lyα damping wing constraints on inhomogeneous reionization
journal, April 2008


The Lyman α forest in optically thin hydrodynamical simulations
journal, December 2014

  • Lukić, Zarija; Stark, Casey W.; Nugent, Peter
  • Monthly Notices of the Royal Astronomical Society, Vol. 446, Issue 4
  • DOI: 10.1093/mnras/stu2377

The Thermal Proximity Effect: A New Probe of the He ii Reionization History and Quasar Lifetime
journal, March 2017

  • Khrykin, I. S.; Hennawi, J. F.; McQuinn, M.
  • The Astrophysical Journal, Vol. 838, Issue 2
  • DOI: 10.3847/1538-4357/aa6621

Efficient Simulations of Early Structure Formation and Reionization
journal, November 2007

  • Mesinger, Andrei; Furlanetto, Steven
  • The Astrophysical Journal, Vol. 669, Issue 2
  • DOI: 10.1086/521806

Physical Properties of 15 Quasars at z ≳ 6.5
journal, November 2017

  • Mazzucchelli, C.; Bañados, E.; Venemans, B. P.
  • The Astrophysical Journal, Vol. 849, Issue 2
  • DOI: 10.3847/1538-4357/aa9185

How neutral is the intergalactic medium surrounding the redshift z = 7.085 quasar ULAS J1120+0641?: How neutral is the IGM around J1120+0641?
journal, July 2011

  • Bolton, J. S.; Haehnelt, M. G.; Warren, S. J.
  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 416, Issue 1
  • DOI: 10.1111/j.1745-3933.2011.01100.x

SILVERRUSH. VI. A simulation of Lyα emitters in the reionization epoch and a comparison with Subaru Hyper Suprime-Cam survey early data
journal, May 2018

  • Inoue, Akio K.; Hasegawa, Kenji; Ishiyama, Tomoaki
  • Publications of the Astronomical Society of Japan, Vol. 70, Issue 3
  • DOI: 10.1093/pasj/psy048

On the evolution of the H i column density distribution in cosmological simulations
journal, February 2013

  • Rahmati, Alireza; Pawlik, Andreas H.; Raičevic̀, Milan
  • Monthly Notices of the Royal Astronomical Society, Vol. 430, Issue 3
  • DOI: 10.1093/mnras/stt066

Quasar ionization front Lyα emission in an inhomogeneous intergalactic medium
journal, February 2016

  • Davies, Frederick B.; Furlanetto, Steven R.; McQuinn, Matthew
  • Monthly Notices of the Royal Astronomical Society, Vol. 457, Issue 3
  • DOI: 10.1093/mnras/stw055

Secondary ionization and heating by fast electrons
journal, March 2010


Predicting Quasar Continua near Ly α with Principal Component Analysis
journal, September 2018

  • Davies, Frederick B.; Hennawi, Joseph F.; Bañados, Eduardo
  • The Astrophysical Journal, Vol. 864, Issue 2
  • DOI: 10.3847/1538-4357/aad7f8

The he ii Proximity Effect and the Lifetime of Quasars
journal, June 2016


Characterizing the Pressure Smoothing Scale of the Intergalactic Medium
journal, October 2015

  • Kulkarni, Girish; Hennawi, Joseph F.; Oñorbe, Jose
  • The Astrophysical Journal, Vol. 812, Issue 1
  • DOI: 10.1088/0004-637X/812/1/30

Constraints on Reionization and Source Properties from the Absorption Spectra of z > 6.2 Quasars
journal, May 2007

  • Mesinger, Andrei; Haiman, Zoltan
  • The Astrophysical Journal, Vol. 660, Issue 2
  • DOI: 10.1086/513688

A Survey of [CLC][ITAL]z[/ITAL][/CLC] ] 5.7 Quasars in the Sloan Digital Sky Survey. II. Discovery of Three Additional Quasars at [CLC][ITAL]z[/ITAL][/CLC] ] 6
journal, April 2003

  • Fan, Xiaohui; Strauss, Michael A.; Schneider, Donald P.
  • The Astronomical Journal, Vol. 125, Issue 4
  • DOI: 10.1086/368246

Evidence of Gunn–Peterson damping wings in high-z quasar spectra: strengthening the case for incomplete reionization at z ∼ 6–7
journal, November 2012

  • Schroeder, Joshua; Mesinger, Andrei; Haiman, Zoltán
  • Monthly Notices of the Royal Astronomical Society, Vol. 428, Issue 4
  • DOI: 10.1093/mnras/sts253

Re-examining the case for neutral gas near the redshift 7 quasar ULAS J1120+0641
journal, July 2015

  • Bosman, Sarah E. I.; Becker, George D.
  • Monthly Notices of the Royal Astronomical Society, Vol. 452, Issue 2
  • DOI: 10.1093/mnras/stv1336

Extremely metal-poor gas at a redshift of 7
journal, December 2012

  • Simcoe, Robert A.; Sullivan, Peter W.; Cooksey, Kathy L.
  • Nature, Vol. 492, Issue 7427
  • DOI: 10.1038/nature11612

An 800-million-solar-mass black hole in a significantly neutral Universe at a redshift of 7.5
journal, December 2017

  • Bañados, Eduardo; Venemans, Bram P.; Mazzucchelli, Chiara
  • Nature, Vol. 553, Issue 7689
  • DOI: 10.1038/nature25180

Observations of the spectra of Q0122 - 380 and Q1101 - 264
journal, January 1982

  • Carswell, R. F.; Whelan, J. A. J.; Smith, M. G.
  • Monthly Notices of the Royal Astronomical Society, Vol. 198, Issue 1
  • DOI: 10.1093/mnras/198.1.91

Probing the end of reionization with the near zones of z ≳ 6 QSOs
journal, September 2015

  • Keating, Laura C.; Haehnelt, Martin G.; Cantalupo, Sebastiano
  • Monthly Notices of the Royal Astronomical Society, Vol. 454, Issue 1
  • DOI: 10.1093/mnras/stv2020

The Sloan Digital Sky Survey Quasar Catalog: Twelfth data release
journal, January 2017


First Discoveries of z > 6 Quasars with the DECam Legacy Survey and UKIRT Hemisphere Survey
journal, April 2017


Improved Constraints on the Neutral Intergalactic Hydrogen Surrounding Quasars at Redshifts z > 6
journal, August 2005

  • Wyithe, J. Stuart B.; Loeb, Abraham; Carilli, Chris
  • The Astrophysical Journal, Vol. 628, Issue 2
  • DOI: 10.1086/430874

Probing re-ionization with quasar spectra: the impact of the intrinsic Lyman α emission line shape uncertainty
journal, December 2009


Bayesian Indirect Inference Using a Parametric Auxiliary Model
journal, February 2015

  • Drovandi, Christopher C.; Pettitt, Anthony N.; Lee, Anthony
  • Statistical Science, Vol. 30, Issue 1
  • DOI: 10.1214/14-STS498

A principal component analysis of quasar UV spectra at z  ~  3
journal, May 2011


Planck intermediate results : XLVII.
journal, December 2016


The Growth of H ii Regions During Reionization
journal, September 2004

  • Furlanetto, Steven R.; Zaldarriaga, Matias; Hernquist, Lars
  • The Astrophysical Journal, Vol. 613, Issue 1
  • DOI: 10.1086/423025

THE IDENTIFICATION OF z -DROPOUTS IN PAN-STARRS1: THREE QUASARS AT 6.5< z < 6.7
journal, February 2015


Nyx: A MASSIVELY PARALLEL AMR CODE FOR COMPUTATIONAL COSMOLOGY
journal, February 2013


    Works referencing / citing this record:

    First study of reionization in tilted flat and untilted non-flat dynamical dark energy inflation models
    journal, June 2019

    • Mitra, Sourav; Park, Chan-Gyung; Choudhury, Tirthankar Roy
    • Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 4
    • DOI: 10.1093/mnras/stz1560