128 citations · 1k across the 37 of their papers we have counts for
30 papers · 1 filter
Forecast for the detectability of patchy hydrogen reionization in WEAVE-QSO measurements of the Lyman- forest power spectrum at redshift
Ke Ma, James S. Bolton, Vid Iršič +9
We present the first detailed forecasts for the detectability of patchy hydrogen reionization in the one-dimensional Ly forest power spectrum to be measured by the WEAVE-QSO sur…
An improved model for the effect of correlated Si-III absorption on the one-dimensional Lyman- forest power spectrum
Ke Ma, James S. Bolton, Vid Irsic +2
We present an analysis of Si III absorption and its effect on the 1D Ly forest power spectrum using the Sherwood-Relics hydrodynamical simulation suite. In addition to oscillati…
Efficient Modelling of Lyman-α opacity fluctuations during late reionization epoch
Barun Maity, Frederick Davies, Prakash Gaikwad
The Lyman- forest opacity fluctuations observed from high-redshift quasar spectra have been proven to be extremely successful in order to probe the late phase of the reionizatio…
Measuring photo-ionization rate and mean free path of HeII ionizing photons at : Evidence for late and rapid HeII reionization Part-II
Prakash Gaikwad, Frederick B. Davies, Martin G. Haehnelt
We present measurements of the spatially averaged HeII photo-ionization rate (), mean free path of HeII ionizing photons (), and He…
Percent-level timing of reionization: self-consistent, implicit-likelihood inference from XQR-30+ Ly forest data
Yuxiang Qin, Andrei Mesinger, David Prelogović +13
The Lyman alpha (Lya) forest in the spectra of z>5 quasars provides a powerful probe of the late stages of the Epoch of Reionization (EoR). With the recent advent of exquisite data…
Signatures of warm dark matter in the cosmological density fields extracted using Machine Learning
Ander Artola, Sarah E. I. Bosman, Prakash Gaikwad +6
We aim to construct a machine-learning approach that allows for a pixel-by-pixel reconstruction of the intergalactic medium (IGM) density field for various warm dark matter (WDM) m…
Damping Wing-Like Features in the Stacked Ly Forest: Potential Neutral Hydrogen Islands at
Yongda Zhu, George D. Becker, Sarah E. I. Bosman +28
Recent quasar absorption line observations suggest that reionization may end as late as . As a means to search for large neutral hydrogen islands at , we revisi…
Damping wings in the Lyman-α forest: a model-independent measurement of the neutral fraction at 5.4<z<6.1
Benedetta Spina, Sarah E. I. Bosman, Frederick B. Davies +2
Recent observations have positioned the endpoint of the Epoch of Reionisation (EoR) at redshift . However, observations of the Lyman- forest have not yet been able t…
Deep Learning the Intergalactic Medium using Lyman-alpha Forest at
Fahad Nasir, Prakash Gaikwad, Frederick B. Davies +3
Unveiling the thermal history of the intergalactic medium (IGM) at holds the potential to reveal early onset HeII reionization or lingering thermal fluctuations f…
FLAME: Fitting Ly Absorption lines using Machine learning
Priyanka Jalan, Vikram Khaire, M. Vivek +1
We introduce FLAME, a machine-learning algorithm designed to fit Voigt profiles to HI Lyman-alpha (Ly) absorption lines using deep convolutional neural networks. FLAME integrate…
Constraints on the Evolution of the Ionizing Background and Ionizing Photon Mean Free Path at the End of Reionization
Frederick B. Davies, Sarah E. I. Bosman, Prakash Gaikwad +16
The variations in Ly forest opacity observed at between lines of sight to different background quasars are too strong to be caused by fluctuations in the density field a…
A modified lognormal approximation of the Lyman- forest: comparison with full hydrodynamic simulations at
Bhaskar Arya, Tirthankar Roy Choudhury, Aseem Paranjape +1
Observations of the Lyman- forest in distant quasar spectra with upcoming surveys are expected to provide significantly larger and higher-quality datasets. To interpret these da…
Unveiling Dark Matter free-streaming at the smallest scales with high redshift Lyman-alpha forest
Vid Iršič, Matteo Viel, Martin G. Haehnelt +8
This study introduces novel constraints on the free-streaming of thermal relic warm dark matter (WDM) from Lyman- forest flux power spectra. Our analysis utilises a high-resolut…
Probing Ultra-late Reionization: Direct Measurements of the Mean Free Path over
Yongda Zhu, George D. Becker, Holly M. Christenson +22
The mean free path of ionizing photons, , is a critical parameter for modeling the intergalactic medium (IGM) both during and after reionization. We present direct mea…
Measuring the photo-ionization rate, neutral fraction and mean free path of HI ionizing photons at from a large sample of XShooter and ESI spectra
Prakash Gaikwad, Martin G. Haehnelt, Frederick B. Davies +16
We measure the mean free path (), photo-ionization rate () and neutral fraction () of hydrogen in 12 redshif…
The Sherwood-Relics simulations: overview and impact of patchy reionization and pressure smoothing on the intergalactic medium
Ewald Puchwein, James S. Bolton, Laura C. Keating +10
We present the Sherwood-Relics simulations, a new suite of large cosmological hydrodynamical simulations aimed at modelling the intergalactic medium (IGM) during and after the cosm…
Lognormal semi-numerical simulations of the Lyman- forest: comparison with full hydrodynamic simulations
Bhaskar Arya, Tirthankar Roy Choudhury, Aseem Paranjape +1
Observations of the Lyman- (Ly) forest in spectra of distant quasars enable us to probe the matter power spectrum at relatively small scales. With several upcoming surveys, i…
Long Dark Gaps in the Ly Forest at : Evidence of Ultra Late Reionization from XQR-30 Spectra
Yongda Zhu, George D. Becker, Sarah E. I. Bosman +22
We present a new investigation of the intergalactic medium (IGM) near reionization using dark gaps in the Lyman- (Ly) forest. With its lower optical depth, Ly offers a pot…
Limits on non-canonical heating and turbulence in the intergalactic medium from the low redshift Lyman-alpha forest
James S. Bolton, Prakash Gaikwad, Martin G. Haehnelt +5
We examine the column density distribution function (CDDF) and Doppler parameter distribution from hydrodynamical simulations and Cosmic Origins Spectrograph (COS) observations of…
The effect of inhomogeneous reionisation on the Lyman- forest power spectrum at redshift : implications for thermal parameter recovery
Margherita Molaro, Vid Iršič, James S. Bolton +6
We use the Sherwood-Relics suite of hybrid hydrodynamical and radiative transfer simulations to model the effect of inhomogeneous reionisation on the 1D power spectrum of the \Lya…
Measurement of redshift-space two- and three-point correlation of Ly absorbers at : Implications on evolution of the physical properties of IGM
Soumak Maitra, Raghunathan Srianand, Prakash Gaikwad
We present redshift space two-point (), three-point () and reduced three-point (Q) correlations of Ly absorbers (Voigt profile components having HI column density, $N_{\rm…
A consistent and robust measurement of the thermal state of the IGM at from a large sample of Ly forest spectra: Evidence for late and rapid HeII reionization
Prakash Gaikwad, Raghunathan Srianand, Martin G. Haehnelt +1
We characterise the thermal state of the intergalactic medium (IGM) in ten redshift bins in the redshift range with a sample of 103 high resolution, high S/N Ly$α…
Three- and two-point spatial correlations of IGM at : Cloud based analysis using simulations
Soumak Maitra, Raghunathan Srianand, Prakash Gaikwad +3
Ly forest absorption spectra decomposed into multiple Voigt profile components (clouds) allow us to study clustering of intergalactic medium (IGM) as a function of HI column den…
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…