Viel, M., Bolton, J. S., Haehnelt, M. G.
We use the probability distribution function (PDF) of the lya forest flux at z=2-3, measured from high-resolution UVES/VLT data, and hydrodynamical simulations to obtain constraints on cosmological...
Primordial non-Gaussianities in the intergalactic medium (2009)
Viel, M., Branchini, E., Dolag, K., Grossi, M., Matarrese, S., Moscardini, L.
Primordial non-Gaussianities in the Intergalactic Medium (2008)
Viel, M., Branchini, E., Dolag, K., Grossi, M., Matarrese, S., Moscardini, L.
We present results from the first high-resolution hydrodynamical simulations of non-Gaussian cosmological models. We focus on the statistical properties of the transmitted Lyman-alpha flux in the...
The evolution of a pre-heated Intergalactic Medium (2008)
We analyse the evolution of the Intergalactic Medium (IGM) by means of an extended set of large box size hydrodynamical simulations which include pre-heating. We focus on the properties of the z~2...
The effects of primordial non-Gaussianity on the cosmological reionization (2008)
Crociani, D., Moscardini, L., Viel, M., Matarrese, S.
We investigate the effects of non-Gaussianity in the primordial density field on the reionization history. We rely on a semi-analytic method to describe the processes acting on the intergalactic...
The QSO proximity effect at redshift =2.6 with the FLO approach (2008)
D'Odorico, V., Bruscoli, M., Saitta, F., Fontanot, F., Viel, M., Cristiani, S., ...
We revisit the proximity effect produced by QSOs at redshifts 2.1-3.3 applying the FLO approach (Saitta et al. 2008) to a sample of ~6300 Ly-alpha lines fitted in 21 high resolution, high...
Liske, J., Pasquini, L., Bonifacio, P., Bouchy, F., Carswell, R. F., Cristiani, S., ...
CODEX and ESPRESSO are concepts for ultra-stable, high-resolution spectrographs at the E-ELT and VLT, respectively. Both instruments are well motivated by distinct sets of science drivers. However,...
Cosmic dynamics in the era of Extremely Large Telescopes (2008)
Liske, J., Grazian, A., Vanzella, E., Dessauges, M., Viel, M., Pasquini, L., ...
The redshifts of all cosmologically distant sources are expected to experience a small, systematic drift as a function of time due to the evolution of the Universe's expansion rate. A measurement of...
The quasar proximity effect at redshift ~= 2.6 with the From Lines to Overdensities approach (2008)
D'Odorico, V., Bruscoli, M., Saitta, F., Fontanot, F., Viel, M., Cristiani, S., ...
We revisit the proximity effect produced by quasars (QSOs) at redshifts 2.1-3.3 applying the From Lines to Overdensities (FLO) approach to a sample of ~6300 Lyalpha lines fitted in 21 high...
The CODEX-ESPRESSO experiment: cosmic dynamics, fundamental physics, planets and much more.. (2007)
Cristiani, S., Avila, G., Bonifacio, P., Bouchy, F., Carswell, B., D'Odorico, S., ...
CODEX, a high resolution, super-stable spectrograph to be fed by the E-ELT, the most powerful telescope ever conceived, will for the first time provide the possibility of directly measuring the...
Tracing the gas at redshift 1.7-3.5 with the Lyman-alpha forest: the FLO approach (2007)
Saitta, F., D'Odorico, V., Bruscoli, M., Cristiani, S., Monaco, P., Viel, M.
[Abridged] We present FLO (From Lines to Over-densities), a new technique to reconstruct the hydrogen density field for the Lya forest lines observed in high resolution QSO spectra. The method is...
Bolton, J. S., Viel, M., Haehnelt, M. G., Carswell, R. F.
We compare the improved measurement of the Lya forest flux probability distribution at 1.7
Bolton, J. S., Viel, M., Haehnelt, M. G., Carswell, R. F.
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...
A combined analysis of 3D weak lensing, Lyman-α forest and WMAP year three data (2007)
Lesgourgues, J., Viel, M., Haehnelt, M. G., Massey, R.
We present constraints on the amplitude and shape of the matter power spectrum and the density of dark matter within the framework of a standard ΛCDM model. We use a Markov chain Monte Carlo...
Viel, M., Becker, G. D., Bolton, J. S., Haehnelt, M. G., Rauch, M., Sargent, W. L. W.
We present constraints on the mass of warm dark matter (WDM) particles derived from the Lyman-alpha flux power spectrum of 55 high- resolution HIRES spectra at 2.0 < z < 6.4. From the HIRES spectra,...
Cosmic reionization in a dynamic quintessence cosmology (2007)
Crociani, D., Viel, M., Moscardini, L., Bartelmann, M., Meneghetti, M.
In this paper we investigate the effects that a dynamic dark energy component dominant in the universe at late epochs has on reionization. We follow the evolution of HII regions with the analytic...
A combined analysis of 3D Weak Lensing, Lyman-alpha forest and WMAP year three data (2007)
Lesgourgues, J., Viel, M., Haehnelt, M. G., Massey, R.
We present constraints on the amplitude and shape of the matter power spectrum and the density of dark matter within the framework of a standard LambdaCDM model. We use a Markov Chain Monte Carlo...
Tomography of the intergalactic medium with Ly alpha forests in close QSO pairs (2006)
D’Odorico, V., Viel, M., Saitta, F., Cristiani, S., Bianchi, S., Boyle, B., ...
We study the three-dimensional distribution of non-virialized matter at z similar to 2 using high-resolution spectra of quasi-stellar object (QSO) pairs and simulated spectra drawn from cosmological...
Tomography of the intergalactic medium with Ly-alpha forests in close QSO pairs (2006)
D'Odorico, V., Viel, M., Saitta, F., Cristiani, S., Bianchi, S., Boyle, B., ...
We study the three-dimensional distribution of non virialised matter at z~2 using high resolution spectra of QSO pairs and simulated spectra drawn from cosmological hydrodynamical simulations. We...
On the formation of dwarf galaxies and stellar halos (2006)
Read, J. I., Pontzen, A. P., Viel, M.
Using analytic arguments and a suite of very high resolution (10^3 Msun per particle) cosmological hydro-dynamical simulations, we argue that high redshift, z ~ 10, M ~ 10^8 Msun halos, form the...
Can sterile neutrinos be ruled out as warm dark matter candidates? (2006)
Viel, M, Lesgourgues, Julien, Hähnelt, M G, Matarrese, S, Riotto, Antonio
We present constraints on the mass of Warm Dark Matter (WDM) particles from a combined analysis of the matter power spectrum inferred from the SDSS (Sloan Digital Sky Survey) Lyman-alpha flux power...
Spectrum of CFTR Mutations on Reunion Island: Effect of Neonatal Screening (2006)
Bienvenu, T., Viel, M., Leroy, C., Cartault, F., Lesure, J. F., Renouil, M.
Human Biology - Volume 77, Number 5, October 2005
The matter power spectrum from the Lyman-alpha forest: an optical depth estimate (2005)
Zaroubi, S., Viel, M., Nusser, A., Haehnelt, M.
We measure the matter power spectrum from the Lyman-alpha forest of 31 quasar spectra spanning the redshift range of 1.6-3.6. The optical depth, $\tau$, for absorption of the intergalactic medium is...
Probing 3-D matter distribution at z~2 with QSO multiple lines of sight (2005)
Cristiani, S., D'Odorico, V., Saitta, F., Viel, M., Bianchi, S., Boyle, B., ...
We investigate the 3-D matter distribution at z~2 with high resolution (R ~ 40000) spectra of QSO pairs and groups obtained with the UVES spectrograph at ESO VLT. Our sample is unique for the number...
Viel, M., Lesgourgues, J., Haehnelt, M. G., Matarrese, S., Riotto, A.
The matter power spectrum at comoving scales of (1-40) h^{-1} Mpc is very sensitive to the presence of Warm Dark Matter (WDM) particles with large free streaming lengths. We present constraints on...
Tracing the Warm Hot Intergalactic Medium in the local Universe (2004)
Viel, M., Branchini, E., Cen, R., Ostriker, J. P., Matarrese, S., Mazzotta, P., ...
We present a simple method for tracing the spatial distribution and predicting the physical properties of the Warm-Hot Intergalactic Medium (WHIM), from the map of galaxy light in the local universe....
The Lyman-alpha forest according to LUQAS (2004)
Viel, M., Haehnelt, M., Carswell, B., Cristiani, S., Heavens, A., ...
We use the LUQAS sample of 27 high resolution, high signal-to-noise QSO absorption spectra (Kim et al. 2004) and the results from Croft et al. (2002) together with a suite of high-resolution...
The Lyman-α forest according to LUQAS (2004)
Viel, M., Haehnelt, M., Carswell, B., Cristiani, S., Heavens, A., ...
Viel, M., Matarrese, S., Heavens, A., Haehnelt, M. G., Springel, V., ...
We present a determination of the bispectrum of the flux in the Lyman-alpha forest of QSO absorption spectra obtained from LUQAS which consists of spectra observed with the high resolution Echelle...
Viel, M., Haehnelt, M. G., Carswell, R. F., Cristiani, S.
The flux power spectra of the Lyman-alpha forest from a sample of 27 QSOs taken with the high resolution echelle spectrograph UVES on VLT are presented. We find a similar fluctuation amplitude at the...
Viel, M., Haehnelt, M. G., Carswell, R. F.
We demonstrate that the lyman alpha forest flux power spectrum of ``randomised'' QSO absorption spectra is comparable in shape and amplitude to the flux power spectrum of the original observed...
Dark energy effects on the Lyman-alpha forest (2002)
Viel, M., Matarrese, S., Theuns, Tom, Munshi, D., Wang, Yun
In quintessence models, the dark energy content of the universe is described by a slowly rolling scalar field whose pressure and energy density obey an equation of state of the form p=w $\rho$; w is...
Detecting X-ray filaments in the low redshift Universe with XEUS and Constellation-X (2002)
Viel, M., Branchini, E., Cen, R., Matarrese, S., Mazzotta, P., Ostriker, J. P.
We propose a possible way to detect baryons at low redshifts from the analysis of X-ray absorption spectra of bright AGN pairs. A simple semi-analytical model to simulate the spectra is presented. We...
Modelling the IGM and the Lyalpha forest at high redshift from the dark matter distribution (2002)
Viel, M., Matarrese, S., Mo, H. J., Theuns, Tom, Haehnelt, M. G.
A variety of approximate schemes for modelling the low-density Intergalactic Medium (IGM) in the high-redshift Universe is compared to the results of a large high-resolution hydro-dynamical...
Viel, M., Matarrese, S., Mo, H. J., Haehnelt, M. G., Theuns, T.
We present an effective implementation of analytical calculations of the Lyalpha opacity distribution of the intergalactic medium (IGM) along multiple lines of sight (LOS) to distant quasars in a...
Modelling the IGM and the Ly alpha forest at high redshift from the dark matter distribution (2002)
Viel, M., Matarrese, S., Mo, H. J., Theuns, T., Haehnelt, M. G.
A variety of approximate schemes for modelling the low-density intergalactic medium (IGM) in the high-redshift Universe are compared with the results of a large high-resolution hydrodynamical...
Viel, M., Matarrese, S., Mo, H. J., Haehnelt, M. G., Theuns, Tom
(abridged) We present an effective implementation of analytical calculations of the Lyalpha opacity distribution of the Intergalactic Medium (IGM) along multiple lines of sight (LOS) to distant...