All Outputs (78)

Revealing reionization with the thermal history of the intergalactic medium: new constrainst from the Lyα flux power spectrum (2019)
Journal Article

We present a new investigation of the thermal history of the intergalactic medium (IGM) during and after reionization using the Lyman-α forest flux power spectrum at 4.0 z 5.2. Using a sample of 15 high– resolution spectra, we measure the flux power... Read More about Revealing reionization with the thermal history of the intergalactic medium: new constrainst from the Lyα flux power spectrum.

A new measurement of the intergalactic temperature at z∼2.55 − 2.95 (2017)
Journal Article

We present two measurements of the temperature-density relationship (TDR) of the intergalactic medium (IGM) in the redshift range 2.55 < z < 2.95 using a sample of 13 high-quality quasar spectra and high resolution numerical simulations of the IGM. O... Read More about A new measurement of the intergalactic temperature at z∼2.55 − 2.95.

First constraints on fuzzy dark matter from Lyman-alpha forest data and hydrodynamical simulations (2017)
Journal Article

We present constraints on the masses of extremely light bosons dubbed fuzzy dark matter from Lyman- ? forest data. Extremely light bosons with a De Broglie wavelength of ~ 1 kpc have been suggested as dark matter candidates that may resolve some of t... Read More about First constraints on fuzzy dark matter from Lyman-alpha forest data and hydrodynamical simulations.

New constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-alpha forest data (2017)
Journal Article

We present new measurements of the free-streaming of warm dark matter (WDM) from Lyman-α flux-power spectra. We use data from the medium resolution, intermediate redshift XQ-100 sample observed with the X-shooter spectrograph (z = 3 – 4.2) and the hi... Read More about New constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-alpha forest data.

The effect of stellar and AGN feedback on the low-redshift Lyman α forest in the Sherwood simulation suite (2017)
Journal Article

We study the effect of different feedback prescriptions on the properties of the low redshift (z ≤ 1.6) Ly α forest using a selection of hydrodynamical simulations drawn from the Sherwood simulation suite. The simulations incorporate stellar feedback... Read More about The effect of stellar and AGN feedback on the low-redshift Lyman α forest in the Sherwood simulation suite.

Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite (2017)
Journal Article

Modern theories of galaxy formation predict that galaxies impact on their gaseous surroundings, playing the fundamental role of regulating the amount of gas converted into stars. While star-forming galaxies are believed to provide feedback through ga... Read More about Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite.

Diagnosing galactic feedback with line broadening in the low redshift Lyα forest (2017)
Journal Article

We compare the low-redshift (z 0.1) Lyα forest from hydrodynamical simulations with data from the Cosmic Origins Spectrograph. We find the tension between the observed number of lines with b-parameters in the range of 25–45 km s−1 and the prediction... Read More about Diagnosing galactic feedback with line broadening in the low redshift Lyα forest.

The Lyman α forest power spectrum from the XQ-100 legacy survey (2016)
Journal Article

We present the Lyman α flux power spectrum measurements of the XQ-100 sample of quasar spectra obtained in the context of the European Southern Observatory Large Programme ‘Quasars and their absorption lines: a legacy survey of the high redshift univ... Read More about The Lyman α forest power spectrum from the XQ-100 legacy survey.

Exploring the thermal state of the low-density intergalactic medium at z = 3 with an ultra-high signal-to-noise QSO spectrum (2016)
Journal Article

At low densities, the standard ionization history of the intergalactic medium (IGM) predicts a decreasing temperature of the IGM with decreasing density once hydrogen (and helium) reionization is complete. Heating the high-redshift, low-density IGM a... Read More about Exploring the thermal state of the low-density intergalactic medium at z = 3 with an ultra-high signal-to-noise QSO spectrum.

The Sherwood simulation suite: overview and data comparisons with the Lyman-α forest at redshifts 2≤z≤5 (2016)
Journal Article

We introduce a new set of large-scale, high-resolution hydrodynamical simulations of the intergalactic medium: the Sherwood simulation suite. These are performed in volumes of 103–1603h−3 comoving Mpc3, span almost four orders of magnitude in mass re... Read More about The Sherwood simulation suite: overview and data comparisons with the Lyman-α forest at redshifts 2≤z≤5.

Inferring the IGM thermal history during reionization with the Lyman α forest power spectrum at redshiftz≃ 5 (2016)
Journal Article

We use cosmological hydrodynamical simulations to assess the feasibility of constraining the thermal history of the intergalactic medium during reionisation with the Lyα forest at z ≃ 5. The integrated thermal history has a measureable impact on the... Read More about Inferring the IGM thermal history during reionization with the Lyman α forest power spectrum at redshiftz≃ 5.

Testing the effect of galactic feedback on the IGM at z∼ 6 with metal-line absorbers (2016)
Journal Article

We present models of low- and high-ionization metal-line absorbers (O i, C ii, C iv and Mg ii) during the end of the reionization epoch, at z ∼ 6. Using four cosmological hydrodynamical simulations with different feedback schemes (including the Illus... Read More about Testing the effect of galactic feedback on the IGM at z∼ 6 with metal-line absorbers.

Constraining the temperature–density relation of the intergalactic medium with the Lyman α and β forests (2015)
Journal Article

The post-reionization thermal state of the intergalactic medium is characterized by a power-law relationship between temperature and density, with a slope determined by the parameter ?. We describe a new method to measure ? using the ratio of flux cu... Read More about Constraining the temperature–density relation of the intergalactic medium with the Lyman α and β forests.

Reionisation and High-Redshift Galaxies: The View from Quasar Absorption Lines (2015)
Journal Article

Determining when and how the first galaxies reionised the intergalactic medium promises to shed light on both the nature of the first objects and the cosmic history of baryons. Towards this goal, quasar absorption lines play a unique role by probing... Read More about Reionisation and High-Redshift Galaxies: The View from Quasar Absorption Lines.

Gas around galaxy haloes – II. Hydrogen absorption signatures from the environments of galaxies at redshifts 2 (2015)
Journal Article

We compare predictions of large-scale cosmological hydrodynamical simulations for neutral hydrogen absorption signatures in the vicinity of 1011–1012.5 M⊙ haloes with observational measurements. Two different hydrodynamical techniques and a variety o... Read More about Gas around galaxy haloes – II. Hydrogen absorption signatures from the environments of galaxies at redshifts 2.

Simulating the 21cm forest detectable with LOFAR and SKA in the spectra of high-zGRBs (2015)
Journal Article

We investigate the feasibility of detecting 21 cm absorption features in the afterglow spectra of high redshift long Gamma Ray Bursts (GRBs). This is done employing simulations of cosmic reionization, together with estimates of the GRB radio afterglo... Read More about Simulating the 21cm forest detectable with LOFAR and SKA in the spectra of high-zGRBs.

Lyman ? emitters gone missing: evidence for late reionization? (2015)
Journal Article

We combine high resolution hydrodynamical simulations with an intermediate resolution, dark matter only simulation and an analytical model for the growth of ionized regions to estimate the large scale distribution and redshift evolution of the visibi... Read More about Lyman ? emitters gone missing: evidence for late reionization?.

The photoheating of the intergalactic medium in synthesis models of the UV background (2015)
Journal Article

We compare cosmological hydrodynamical simulations combined with the homogeneous metagalactic UV background (UVB) of Haardt & Madau (2012) (HM2012) to observations of the Lyman-alpha forest that are sensitive to the thermal and ionization state of th... Read More about The photoheating of the intergalactic medium in synthesis models of the UV background.

IGM constraints from the SDSS-III/BOSS DR9 Ly? forest transmission probability distribution function (2015)
Journal Article

© 2015. The American Astronomical Society. All rights reserved. The Lyα forest transmission probability distribution function (PDF) is an established probe of the intergalactic medium (IGM) astrophysics, especially the temperature-density relationshi... Read More about IGM constraints from the SDSS-III/BOSS DR9 Ly? forest transmission probability distribution function.

Evidence of patchy hydrogen reionization from an extreme Ly? trough below redshift six (2015)
Journal Article

© 2015 The Authors. We report the discovery of an extremely long (~110 Mpc h -1 ) and dark (τ eff ≳ 7) Lyα trough extending down to z ≃ 5.5 towards the z em ≃ 6.0 quasar ULAS J0148+0600. We use these new data in combination with Lya forest measureme... Read More about Evidence of patchy hydrogen reionization from an extreme Ly? trough below redshift six.