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Gas around galaxy haloes: Methodology comparisons using hydrodynamical simulations of the intergalactic medium (2014)
Journal Article

© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. We perform cosmological simulations of the intergalactic medium (IGM) at redshift z ~ 3 using the numerical gravity-hydrodynamics codes GADGET-3 and... Read More about Gas around galaxy haloes: Methodology comparisons using hydrodynamical simulations of the intergalactic medium.

New approach for precise computation of Lyman-alpha forest power spectrum with hydrodynamical simulations (2014)
Journal Article

Current experiments are providing measurements of the flux power spectrum from the Lyman-α forests observed in quasar spectra with unprecedented accuracy. Their interpretation in terms of cosmological constraints requires specific simulations of at l... Read More about New approach for precise computation of Lyman-alpha forest power spectrum with hydrodynamical simulations.

The thermal history of the intergalactic medium down to redshift z=1.5: a new curvature measurement (2014)
Journal Article

According to the photoheating model of the intergalactic medium (IGM), He ii reionization is expected to affect its thermal evolution. Evidence for additional energy injection into the IGM has been found at 3 ≲ z ≲ 4, though the evidence for the subs... Read More about The thermal history of the intergalactic medium down to redshift z=1.5: a new curvature measurement.

Probing the metallicity and ionization state of the circumgalactic medium at z~6 and beyond with OI absorption (2013)
Journal Article

Low-ionization metal absorption due to O I has been identified as an important probe of the physical state of the intergalactic/circumgalactic medium at the tail end of reionization. We use here high-resolution hydrodynamic simulations to interpret t... Read More about Probing the metallicity and ionization state of the circumgalactic medium at z~6 and beyond with OI absorption.

New measurements of the ionizing ultraviolet background over 2 < z < 5 and implications for hydrogen reionization (2013)
Journal Article

We present new measurements of the intensity of the ionizing ultraviolet background and the global emissivity of ionizing photons over 2 < z < 5. Our results are based on a suite of updated measurements of physical properties of the high-redshift int... Read More about New measurements of the ionizing ultraviolet background over 2 < z < 5 and implications for hydrogen reionization.

On the rapid demise of Lyman-alpha emitters at z>7 due to the increasing incidence of optically thick absorption systems (2013)
Journal Article

A variety of independent observational studies have now reported a significant decline in the fraction of Lyman-break galaxies which exhibit Ly-a emission over the redshift interval z=6-7. In combination with the strong damping wing extending redward... Read More about On the rapid demise of Lyman-alpha emitters at z>7 due to the increasing incidence of optically thick absorption systems.

The intergalactic medium thermal history at redshift z = 1.7–3.2 from the Lyα forest: a comparison of measurements using wavelets and the flux distribution (2012)
Journal Article

We investigate the thermal history of the intergalactic medium (IGM) in the redshift interval z = 1.7–3.2 by studying the small-scale fluctuations in the Lyman α forest transmitted flux. We apply a wavelet filtering technique to 18 high-resolution qu... Read More about The intergalactic medium thermal history at redshift z = 1.7–3.2 from the Lyα forest: a comparison of measurements using wavelets and the flux distribution.

The effect of intergalactic helium on hydrogen reionization: implications for the sources of ionizing photons at z>6 (2012)
Journal Article

We investigate the effect of primordial helium on hydrogen reionization using a hydrodynamical simulation combined with the cosmological radiative transfer code CRASH. The radiative transfer simulations are performed in a 35.12 h−1 comoving Mpc box u... Read More about The effect of intergalactic helium on hydrogen reionization: implications for the sources of ionizing photons at z>6.

Improved measurements of the intergalactic medium temperature around quasars: possible evidence for the initial stages of He-II reionisation at z~6 (2012)
Journal Article

We present measurements of the intergalactic medium (IGM) temperature within ~5 proper Mpc of seven luminous quasars at z~6. The constraints are obtained from the Doppler widths of Lyman-alpha absorption lines in the quasar near-zones and build upon... Read More about Improved measurements of the intergalactic medium temperature around quasars: possible evidence for the initial stages of He-II reionisation at z~6.