128 citations · 1k across the 37 of their papers we have counts for
38 papers
Nearly pristine gas in a galaxy 1 billion years after the Big Bang
Sarah E. I. Bosman, Frederick B. Davies, Louise Welsh +22
Excitation of carbon and oxygen ions is the primary mechanism by which collapsing gas clouds dissipate heat to form new stars. At early cosmic times, in galaxies with chemically pr…
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…
Uncertainty-Aware Deep Learning for the Ly Forest: CNN-Based Absorber Detection and Characterization
Paryag Sharma, Vikram Khaire, Ting-Yun Cheng +2
The Ly forest is a powerful probe of the intergalactic medium and small-scale matter distribution, but deriving absorber properties traditionally requires computationally expens…
NISER-IUCAA New Simulations of JWST GAlaxies and Quasars(NINJA): Properties of galaxies at
Ranit Behera, Raghunathan Srianand, Nishikanta Khandai +1
We present the NINJA suite of cosmological hydrodynamical simulations developed to investigate galaxy formation and evolution at in the era of JWST. Using our fiducia…
E-XQR-30: Evidence for an Increase in the Ionization State of Metal Absorbers from z~6 to z~2
Stephanie Rowlands, R. L. Davies, E. Ryan-Weber +15
We investigate the evolution of the ionization state of metal-enriched gas in and around galaxies near the epoch of reionization using a sample of 488 metal absorption systems at 4…
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…
The impact of faint AGN discovered by JWST on reionization
Shikhar Asthana, Martin G. Haehnelt, Girish Kulkarni +4
The relative contribution of emission from stellar sources and accretion onto supermassive black holes to reionization has been brought into focus again by the apparent high abunda…
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…
XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
Valentina D'Odorico, E. Banados, G. D. Becker +46
The final phase of the reionization process can be probed by rest-frame UV absorption spectra of quasars at z>6, shedding light on the properties of the diffuse intergalactic mediu…
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…
Role of ionizing background on the statistics of metal absorbers in hydrodynamical simulations
Sukanya Mallik, Raghunathan Srianand, Soumak Maitra +2
We study the statistical properties of O VI, C IV, and Ne VIII absorbers at low- (i.e., ) using Sherwood simulations with "WIND" only and "WIND+AGN" feedback and Massive…
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…