265 citations · 1.1k across the 23 of their papers we have counts for
23 papers
Reionisation time fields reconstruction from 21 cm signal maps
Julien Hiegel, Emilie Thélie, Dominique Aubert +6
During the Epoch of reionisation, the intergalactic medium is reionised by the UV radiation from the first generation of stars and galaxies. One tracer of the process is the 21 cm…
DUSTiER (DUST in the Epoch of Reionization): dusty galaxies in cosmological radiation-hydrodynamical simulations of the Epoch of Reionization with RAMSES-CUDATON
Joseph S. W. Lewis, Pierre Ocvirk, Yohan Dubois +4
In recent years, interstellar dust has become a crucial topic in the study of the high and very high redshift Universe. Evidence points to the existence of high dust masses in mass…
The detectability of strong 21 centimetre forest absorbers from the diffuse intergalactic medium in late reionisation models
Tomáš Šoltinský, James S. Bolton, Nina Hatch +6
A late end to reionisation at redshift is consistent with observed spatial variations in the Ly forest transmission and the deficit of Ly emitting galaxies arou…
Lyman-alpha opacities at z=4-6 require low mass, radiatively-suppressed galaxies to drive cosmic reionization
Pierre Ocvirk, Joseph S. W. Lewis, Nicolas Gillet +4
The high redshift Lyman-alpha forest, in particular the Gunn-Peterson trough, is the most unambiguous signature of the neutral to ionized transition of the intergalactic medium (IG…
Predicting Images for the Dynamics Of stellar Clusters (π-DOC): a deep learning framework to predict mass, distance and age of globular clusters
Jonathan Chardin, Paolo Bianchini
Dynamical mass estimates of simple systems such globular clusters (GCs) still suffer from up to a factor of 2 uncertainty. This is primarily due to the oversimplifications of stand…
Implications of the Lyman- forest for the 21-cm power spectrum from the epoch of reionization
Janakee Raste, Girish Kulkarni, Laura C. Keating +3
Our understanding of the intergalactic medium at redshifts - has improved considerably in the last few years due to the discovery of quasars with that enable Lyman-$α…
Probing the thermal state of the intergalactic medium at with the transmission spikes in high-resolution Ly forest spectra
Prakash Gaikwad, Michael Rauch, Martin G. Haehnelt +13
We compare a sample of five high-resolution, high S/N Ly forest spectra of bright QSOs aimed at spectrally resolving the last remaining transmission spikes at…
Galactic ionising photon budget during the Epoch of Reionisation in the Cosmic Dawn II simulation
Joseph S. W. Lewis, Pierre Ocvirk, Dominique Aubert +10
Cosmic Dawn ("CoDa") II yields the first statistically-meaningful determination of the relative contribution to reionization by galaxies of different halo mass, from a fully-couple…
Constraining the second half of reionization with the Lyman- forest
Laura C. Keating, Girish Kulkarni, Martin G. Haehnelt +2
We present an analysis of the evolution of the Lyman-series forest into the epoch of reionization using cosmological radiative transfer simulations in a scenario where reionization…
Long troughs in the Lyman- forest below redshift 6 due to islands of neutral hydrogen
Laura C. Keating, Lewis H. Weinberger, Girish Kulkarni +3
A long (110 cMpc/) and deep absorption trough in the Ly forest has been observed extending down to redshift 5.5 in the spectrum of ULAS J0148+0600. Although no Ly transmis…
A deep learning model to emulate simulations of cosmic reionization
Jonathan Chardin, Grégoire Uhlrich, Dominique Aubert +4
We present a deep learning model trained to emulate the radiative transfer during the epoch of cosmological reionization. CRADLE (Cosmological Reionization And Deep LEarning) is an…
Large Lyman-alpha opacity fluctuations and low CMB tau in models of late reionization with large islands of neutral hydrogen extending to z<5.5
Girish Kulkarni, Laura C. Keating, Martin G. Haehnelt +4
High-redshift QSO spectra show large spatial fluctuations in the Ly-alpha opacity of the intergalactic medium on surprisingly large scales at z>~5.5. We present a radiative transfe…
Impact of the reduced speed of light approximation on the post-overlap neutral hydrogen fraction in numerical simulations of the epoch of reionization
P. Ocvirk, D. Aubert, J. Chardin +2
The reduced speed of light approximation is used in a variety of simulations of the epoch of reionization and galaxy formation. Its popularity stems from its ability to drastically…
Impact of the reduced speed of light approximation on ionization front velocities in cosmological simulations of the epoch of reionization
Nicolas Deparis, Dominique Aubert, Pierre Ocvirk +2
Coupled radiative-hydrodynamics simulations of the epoch of reionization aim to reproduce the propagation of ionization fronts during the transition before the overlap of HII regio…
Self-shielding of hydrogen in the IGM during the epoch of reionization
Jonathan Chardin, Girish Kulkarni, Martin G. Haehnelt
We investigate self-shielding of intergalactic hydrogen against ionizing radiation in radiative transfer simulations of cosmic reionization carefully calibrated with Lyman alpha fo…
A tale of seven narrow spikes and a long trough: constraining the timing of the percolation of HII bubbles at the tail-end of reionization with ULAS J1120+0641
Jonathan Chardin, Martin G. haehnelt, Sarah E. I. Bosman +1
High-signal to noise observations of the Ly forest transmissivity in the z = 7.085 QSO ULAS J1120+0641 show seven narrow transmission spikes followed by a long 240 cMpc/h trough…
Large scale opacity fluctuations in the Lyman alpha forest: evidence for QSOs dominating the ionising UV background at z ~ 5.5-6 ?
Jonathan Chardin, Ewald Puchwein, Martin G. Haehnelt
Lyman-alpha forest data probing the post-reionization Universe shows surprisingly large opacity fluctuations over rather large (50 comoving Mpc/h) spatial scales. We model the…
Calibrating cosmological radiative transfer simulations with Lyman alpha forest data: Evidence for large spatial UV background fluctuations at z ~ 5.6 - 5.8 due to rare bright sources
Jonathan Chardin, Martin G. Haehnelt, Dominique Aubert +1
We calibrate here cosmological radiative transfer simulation with ATON/RAMSES with a range of measurements of the Lyman alpha opacity from QSO absorption spectra. We find the Lyman…
The reionization of galactic satellite populations
P. Ocvirk, N. Gillet, D. Aubert +6
We use high resolution simulations of the formation of the local group post-processed by a radiative transfer code for UV photons, to investigate the reionization of the satellite…
Local reionizations histories with merger tree of HII regions
Jonathan Chardin, Dominique Aubert, Pierre Ocvirk
We constrain the initial stage of the reionization process around progenitors of galaxies, such as the extent of the initial HII region before its fusion with the UV background and…
High resolution simulations of the reionization of an isolated Milky Way - M31 galaxy pair
P. Ocvirk, D. Aubert, J. Chardin +5
We present the results of a set of numerical simulations aimed at studying reionization at galactic scale. We use a high resolution simulation of the formation of the Milky Way-M31…
Simulated histories of reionization with merger tree of HII regions
Jonathan Chardin, Dominique Aubert
We describe a new methodology to analyze the reionization process in numerical simulations: The evo- lution of the reionization is investigated by focusing on the merger histories…
A study of simulated histories of reionization with merger trees of HII regions
Jonathan Chardin, Dominique Aubert, Pierre Ocvirk
We describe a new methodology to analyze the reionization process in numerical simulations: the chronology and the geometry of reionization is investigated by means of merger histo…