302 citations · 3k across the 71 of their papers we have counts for
71 papers
The ionizing photon budget and effective clumping factor in radiative transfer simulations calibrated to Lyman-alpha forest data
Shikhar Asthana, Girish Kulkarni, Martin G. Haehnelt +3
Recent JWST observations have allowed for the first time to obtain comprehensive measurements of the ionizing photon production efficiency for a wide range of reion…
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…
The Lyman-limit photon mean free path at the end of late reionisation in the Sherwood-Relics simulations
Jennifer Feron, Luke Conaboy, James S. Bolton +5
Recent evidence supporting reionisation ending at redshift z<6 includes the rapid redshift evolution of the mean free path for Lyman-limit photons through the intergalactic medium…
Late-end reionization with ATON-HE: towards constraints from Lyman- emitters observed with JWST
Shikhar Asthana, Martin G. Haehnelt, Girish Kulkarni +3
We present a new suite of late-end reionization simulations performed with ATON-HE, a revised version of the GPU-based radiative transfer code ATON that includes helium. The simula…
E-XQR-30: The evolution of MgII, CII and OI across 2<z<6
Alma Maria Sebastian, Emma Ryan-Weber, Rebecca L. Davies +12
Intervening metal absorbers in quasar spectra at can be used as probes to study the chemical enrichment of the Universe during the Epoch of Reionization (EoR). This work pr…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the CGM Metal Enrichment at z > 6 Using the JWST and VLT
Siwei Zou, Zheng Cai, Feige Wang +27
We characterize the multiphase circumgalactic medium and galaxy properties at z = 6.0-6.5 in four quasar fields from the James Webb Space Telescope A SPectroscopic survey of biased…
Chronicling the reionization history at with emergent quasar damping wings
Dominika Ďurovčíková, Anna-Christina Eilers, Huanqing Chen +6
The spectra of high-redshift () quasars contain valuable information on the progression of the Epoch of Reionization (EoR). At redshifts , the observed Lyman-serie…
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…
Robustness of direct measurements of the mean free path of ionizing photons in the epoch of reionization
Sindhu Satyavolu, Girish Kulkarni, Laura C. Keating +1
Measurements of the mean free path of Lyman-continuum photons in the intergalactic medium during the epoch of reionization can help constrain the nature of the sources as well as s…
Particle initialization effects on Lyman- forest statistics in cosmological SPH simulations
Nabendu Kumar Khan, Girish Kulkarni, James S. Bolton +4
Confronting measurements of the Lyman- forest with cosmological hydrodynamical simulations has produced stringent constraints on models of particle dark matter and the thermal a…
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…
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…
Investigating the characteristic shape and scatter of intergalactic damping wings during reionization
Laura C. Keating, Ewald Puchwein, James S. Bolton +2
Ly damping wings in the spectra of bright objects at high redshift are a useful probe of the ionization state of the intergalactic medium during the reionization epoch. It has r…
JWST observations of galaxy damping wings during reionization interpreted with cosmological simulations
Laura C. Keating, James S. Bolton, Fergus Cullen +3
Spectra of the highest redshift galaxies taken with JWST are now allowing us to see into the heart of the reionization epoch. Many of these observed galaxies exhibit strong damping…
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…
The 21-cm bispectrum from neutral hydrogen islands at z < 6
Janakee Raste, Girish Kulkarni, Catherine A. Watkinson +2
Spatial variations in the Lyman- forest opacity at seem to require a late end to cosmic reionization. In this picture, the universe contains neutral hydrogen 'islands' of…
New quasar proximity zone size measurements at using the enlarged XQR-30 sample
Sindhu Satyavolu, Anna-Christina Eilers, Girish Kulkarni +15
Proximity zones of high-redshift quasars are unique probes of their central supermassive black holes as well as the intergalactic medium in the last stages of reionization. We pres…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z=6.61 Quasar
Feige Wang, Jinyi Yang, Joseph F. Hennawi +56
We present the first results from the JWST ASPIRE program (A SPectroscopic survey of biased halos In the Reionization Era). This program represents an imaging and spectroscopic sur…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of Quasars Using JWST
Jinyi Yang, Feige Wang, Xiaohui Fan +53
Studies of rest-frame optical emission in quasars at have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (…
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…
Probing quasar lifetimes with proximate -centimetre absorption in the diffuse intergalactic medium at redshifts
Tomáš Šoltinský, James S. Bolton, Margherita Molaro +5
Enhanced ionizing radiation in close proximity to redshift quasars creates short windows of intergalactic Ly transmission blueward of the quasar Ly emission line…
Halo mass function in scale invariant models
Swati Gavas, J S Bagla, Nishikanta Khandai +1
Sheth-Tormen mass function has been widely used to quantify the abundance of dark matter halos. It is a significant improvement over the Press-Schechter mass function as it uses el…
Experimental generation of polarization entanglement from spontaneous parametric down-conversion pumped by spatiotemporally highly incoherent light
Cheng Li, Boris Braverman, Girish Kulkarni +1
The influence of pump coherence on the entanglement produced in spontaneous parametric down-conversion (SPDC) is important to understand, both from a fundamental perspective, and f…
The need for obscured supermassive black hole growth to explain quasar proximity zones in the epoch of reionization
Sindhu Satyavolu, Girish Kulkarni, Laura C. Keating +1
Proximity zones of high-redshift quasars are unique probes of supermassive black hole formation, but simultaneously explaining proximity zone sizes and black hole masses has proved…