All Outputs (78)
A first direct measurement of the intergalactic medium temperature around a quasar at z=6 (2010)
Journal Article
Resolving the high redshift Lyman-alpha forest in smoothed particle hydrodynamics simulations (2009)
Journal Article
We use a large set of cosmological smoothed particle hydrodynamics (SPH) simulations to examine the effect of mass resolution and box size on synthetic Lya forest spectra at 2 \leq z \leq 5. The mass resolution requirements for the convergence of the... Read More about Resolving the high redshift Lyman-alpha forest in smoothed particle hydrodynamics simulations.
The evolution of the Lyman-alpha forest effective optical depth following HeII reionisation (2009)
Journal Article
Three independent observational studies have now detected a narrow (\Delta z ~ 0.5) dip centred at z=3.2 in the otherwise smooth redshift evolution of the Lya forest effective optical depth. This feature has previously been interpreted as an indirect... Read More about The evolution of the Lyman-alpha forest effective optical depth following HeII reionisation.
Photo-heating and the fate of hard photons during the reionisation of HeII by quasars (2009)
Journal Article
We use a combination of analytic and numerical arguments to consider the impact of quasar photo-heating during HeII reionisation on the thermal evolution of the intergalactic medium (IGM). We demonstrate that rapid (\Delta z< 0.1-0.2), strong (\Delta... Read More about Photo-heating and the fate of hard photons during the reionisation of HeII by quasars.
Reionization bias in high-redshift quasar near-zones (2007)
Journal Article
An improved measurement of the flux distribution of the Ly-alpha forest in QSO absorption spectra: the effect of continuum fitting, metal contamination and noise properties (2007)
Journal Article
We have performed an extensive Voigt profile analysis of the neutral hydrogen (HI) and metal absorption present in a sample of 18 high resolution, high signal-to-noise QSO spectra observed with VLT/UVES. We use this analysis to separate the metal con... Read More about An improved measurement of the flux distribution of the Ly-alpha forest in QSO absorption spectra: the effect of continuum fitting, metal contamination and noise properties.
A closer look at using quasar near-zones as a probe of neutral hydrogen in the intergalactic medium (2007)
Journal Article
We examine a large set of synthetic quasar spectra to realistically assess the potential of using the relative sizes of highly ionized near-zones in the Lya and Lyb forest as a probe of the neutral hydrogen content of the intergalactic medium (IGM) a... Read More about A closer look at using quasar near-zones as a probe of neutral hydrogen in the intergalactic medium.
The observed ionization rate of the intergalactic medium and the ionizing emissivity at z >5: Evidence for a photon starved and extended epoch of reionization (2007)
Journal Article
We use a large set of hydrodynamical simulations, combined with measurements of the Lyman alpha opacity of the IGM taken from the literature, to obtain robust estimates for the photoionization rate per hydrogen atom at z=5 and 6. We find the photoion... Read More about The observed ionization rate of the intergalactic medium and the ionizing emissivity at z >5: Evidence for a photon starved and extended epoch of reionization.
The nature and evolution of the highly ionized near-zones in the absorption spectra of z~6 quasars (2006)
Journal Article
We use state-of-the-art hydrodynamical simulations combined with a 1D radiative transfer code to assess the extent to which the highly ionized regions observed close to z~6 quasars, which we refer to as near-zones, can constrain the ionization state... Read More about The nature and evolution of the highly ionized near-zones in the absorption spectra of z~6 quasars.
Spatial fluctuations in the spectral shape of the UV background at 2 (2006)
Journal Article
The low density hydrogen and helium in the IGM probed by QSO absorption lines is sensitive to the amplitude and spectral shape of the metagalactic UV background. We use realistic HI and HeII Ly-alpha forest spectra, constructed from state-of-the-art... Read More about Spatial fluctuations in the spectral shape of the UV background at 2.
Constraints on the metagalactic hydrogen ionization rate from the Lyman-alpha forest opacity (2005)
Journal Article
The Lyman-alpha forest opacity and the metagalactic hydrogen ionization rate at z~2-4 (2005)
Journal Article
Estimates of the metagalactic hydrogen ionization rate from the Lyman-alpha forest opacity in QSO absorption spectra depend on the complex density distribution of neutral hydrogen along the line-of-sight. We use a large suite of high resolution hydro... Read More about The Lyman-alpha forest opacity and the metagalactic hydrogen ionization rate at z~2-4.
Radiative transfer through the intergalactic medium (2004)
Journal Article
We use a probabilistic method to compute the propagation of an ionization front corresponding to the reionization of the intergalactic medium in a Λ-cold dark matter (ΛCDM) cosmology, including both hydrogen and helium. The effects of radiative trans... Read More about Radiative transfer through the intergalactic medium.