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

@article{Davies2018QuantitativeCO,
  title={Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7},
  author={Frederick B. Davies and Joseph F. Hennawi and Eduardo Ba{\~n}ados and Zarija Luki'c and Roberto Decarli and Xiaohui Fan and Emanuele Paolo Farina and Chiara Mazzucchelli and Hans-Walter Rix and Bram P. Venemans and Fabian Walter and Feige Wang and Jinyi Yang},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  year={2018}
}
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 $x_{\rm HI}(z)$ at that epoch. Obtaining reliable quantitative constraints from this technique, however, is challenging due to stochasticity induced by the patchy inside-out topology of… Expand
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Beyond Optical Depth: Future Determination of Ionization History from the Cosmic Microwave Background.
TLDR
The fundamental limits to which reionization histories can be constrained using only large-scale cosmic microwave background (CMB) anisotropy measurements are explored and future high signal-to-noise measurements of the multipoles 10 ⩽ ℓ < 20 are especially important for breaking the degeneracy between x e min and z re. Expand
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References

SHOWING 1-10 OF 79 REFERENCES
The Universe is Reionizing at z~7: Bayesian Inference of the IGM Neutral Fraction Using Ly$α$ Emission from Galaxies
We present a new flexible Bayesian framework for directly inferring the fraction of neutral hydrogen in the intergalactic medium (IGM) during the Epoch of Reionization (EoR, z~6-10) from detectionsExpand
Probing re-ionization with quasar spectra: the impact of the intrinsic Lyman α emission line shape uncertainty
Arguably the best hope of understanding the tail end of the re-ionization of the intergalactic medium (IGM) at redshift z > 6 is through the detection and characterization of the Gunn-PetersonExpand
Lyα damping wing constraints on inhomogeneous reionization
One well-known way to constrain the hydrogen neutral fraction, x HI , of the high-redshift intergalactic medium (IGM) is through the shape of the red damping wing of the Lya absorption line. WeExpand
Constraints on reionization and source properties from the absorption spectra of z > 6.2 quasars
We make use of hydrodynamical simulations of the intergalactic medium (IGM) to create model quasar absorption spectra. We compare these model spectra with the observed Keck spectra of three z > 6.2Expand
Cosmic Reionization and Early Star-forming Galaxies: a Joint Analysis of new Constraints From Planck and the Hubble Space Telescope
We discuss new constraints on the epoch of cosmic reionization and test the assumption that most of the ionizing photons responsible arose from high-redshift star-forming galaxies. Good progress hasExpand
Evidence for reionization at z ∼ 6: Detection of a gunn-peterson trough in a z = 6.28 quasar
We present moderate-resolution Keck spectroscopy of quasars at z = 5.82, 5.99, and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). We find that the Ly? absorption in the spectra of theseExpand
Evidence of Gunn–Peterson damping wings in high-z quasar spectra: strengthening the case for incomplete reionization at z ∼ 6–7
The spectra of several high-redshift (z>6) quasars have shown evidence for a Gunn-Peterson (GP) damping wing, indicating a substantial mean neutral hydrogen fraction (x_HI > 0.03) in the z ~ 6Expand
Quasar ionization front Lyα emission in an inhomogeneous intergalactic medium
The conditions within the ionization front of a quasar during reionization (T � 30,000 K, neutral hydrogen fraction xH I � 0.5) are ideal for producing Lyα emission via collisional ex- citation ofExpand
Reionization of the Intergalactic Medium and the Damping Wing of the Gunn-Peterson Trough
Observations of high-redshift quasars show that the intergalactic medium (IGM) must have been reionized at some redshift z > 5. If a source of radiation could be observed at the rest-frame LyαExpand
A Fundamental Test for Galaxy Formation Models: Matching the Lyman-α Absorption Profiles of Galactic Halos Over Three Decades in Distance
Author(s): Sorini, D; Onorbe, J; Hennawi, JF; Lukic, Z | Abstract: © 2018. The American Astronomical Society. All rights reserved.. Galaxy formation depends critically on the physical state of gas inExpand
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