302 citations · 1.9k across the 68 of their papers we have counts for
18 papers · 1 filter
Studying dark gaps in Ly- forest transmission with large reionization simulations
Barun Maity, Frederick B. Davies, Benedetta Spina +1
The physical conditions of the intergalactic medium (IGM) during the final stages of cosmic reionization () are not yet fully understood. Recent reports of unexpected…
Detecting the signature of helium reionization through 3HeII 3.46cm line-intensity mapping
Benedetta Spina, Cristiano Porciani, Sarah E. I. Bosman +4
Helium reionization is the most recent phase change of the intergalactic medium, yet its timing and main drivers remain uncertain. Among the probes to trace its unfolding, the 3.46…
First constraints on the local ionization topology in front of two quasars at z ~ 7.5
Timo Kist, Joseph F. Hennawi, Frederick B. Davies +10
Thus far, Lyman- damping wings towards quasars have been used to probe the \textit{global} ionization state of the foreground intergalactic medium (IGM). A new parameterization…
Measuring the IGM correlation length at 5<z<6.1: a fast change at the end of Reionization
Benedetta Spina, Sarah E. I. Bosman, Barun Maity +1
The Lyman- forest of high redshift quasars is a powerful probe of the late stages of the Epoch of Reionization (EoR), particularly through the presence of Gunn-Peterson troughs.…
A New Approach for Constraining Large-Scale Temperature Fluctuations in the Intergalactic Medium
Saba Etezad-Razavi, Sarah E. I. Bosman, Frederick B. Davies
The reionization of helium is thought to occur at , marking the last phase transition and final global heating event of the intergalactic medium (IGM). Sinc…
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 Predicament of Absorption-dominated Reionization II: Observational Estimate of the Clumping Factor at the End of Reionization
Frederick B. Davies, Sarah E. I. Bosman, Steven R. Furlanetto
The history of reionization reflects the cumulative injection of ionizing photons by sources and the absorption of ionizing photons by sinks. The latter process is traditionally de…
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…
IGM damping wing constraints on the tail end of reionisation from the enlarged XQR-30 sample
Bradley Greig, Andrei Mesinger, Eduardo Bañados +16
The attenuation of Ly photons by neutral hydrogen in the intergalactic medium (IGM) at continues to be a powerful probe for studying the epoch of reionisation. Given…
Measurements of the Lyman- forest flux auto-correlation functions from the extended XQR-30 data set
Molly Wolfson, Joseph F. Hennawi, Sarah E. I. Bosman +14
Recently, the Lyman- (Ly) forest flux auto-correlation function has been shown to be sensitive to the mean free path of hydrogen-ionizing photons, , for simul…
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…
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…
Hydrogen reionisation ends by : Lyman- optical depth measured by the XQR-30 sample
Sarah E. I. Bosman, Frederick B. Davies, George D. Becker +23
The presence of excess scatter in the Ly- forest at , together with the existence of sporadic extended opaque Gunn-Peterson troughs, has started to provide robust evi…
Reionization history constraints from neural network based predictions of high-redshift quasar continua
D. Ďurovčíková, H. Katz, S. E. I. Bosman +3
Observations of the early Universe suggest that reionization was complete by , however, the exact history of this process is still unknown. One method for measuring the evo…
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…
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…
Re-examining the case for neutral gas near the redshift 7 quasar ULAS J1120+0641
Sarah E. I. Bosman, George D. Becker
Signs of damping wing absorption attenuating the Lyman- emission line of the first known quasar, ULAS J1120+0641, recently provided exciting evidence of a significant…