Kavli Affiliate: George Efstathiou | Summary:Observations of the Epoch of Reionization (EoR) have the potential to answer long-standing questions of astrophysical interest regarding the nature of the first luminous sources and their effects on the intergalactic medium (IGM). We present astrophysical constraints from a Neural Density Estimation-Accelerated Bayesian joint analysis of constraints deriving from Cosmic […]

Kavli Affiliate: R. G. McMahon | First 5 Authors: , , , , | Summary: We present new time delays, the main ingredient of time delay cosmography, for 22 lensed quasars resulting from high-cadence r-band monitoring on the 2.6 m ESO VLT Survey Telescope and Max-Planck-Gesellschaft 2.2 m telescope. Each lensed quasar was typically monitored […]

Kavli Affiliate: R. G. McMahon | Summary:We present new time delays, the main ingredient of time delay cosmography, for 22 lensed quasars resulting from high-cadence r-band monitoring on the 2.6 m ESO VLT Survey Telescope and Max-Planck-Gesellschaft 2.2 m telescope. Each lensed quasar was typically monitored for one to four seasons, often shared between the […]

Kavli Affiliate: George Efstathiou | Summary:The first generation of stars, known as Population III (Pop III), played a crucial role in the early Universe through their unique formation environment and metal-free composition. These stars can undergo chemically homogeneous evolution (CHE) due to fast rotation, becoming more compact and hotter/bluer than their (commonly assumed) non-rotating counterparts. […]

Kavli Affiliate: R. G. McMahon | Summary:Narrow-line Seyfert 1 AGNs (NLS1s) represent a unique stage in the black hole growth history, characterised by low black hole masses of approximately $10^6$-$10^8$ solar masses and around-Eddington accretion rates. X-ray studies of NLS1s have largely been confined to the local Universe ($z < 0.2$), while their broad-line counterparts […]

Kavli Affiliate: George Efstathiou | Summary:In the current era of JWST, we continue to uncover a wealth of information about the Universe deep into the Epoch of Reionization. In this work, we use a suite of simulations with 21cmSPACE, to explore the astrophysical properties of early galaxies and their imprint on high-redshift observables. Our analysis […]

Kavli Affiliate: Roberto Maiolino | Summary:JWST has revealed a population of ‘Little Red Dots’ (LRDs): compact, red objects at redshifts z=2-9 with ‘v’-shaped spectral energy distributions, broad permitted lines, and, often, hydrogen Balmer absorption. We use NIRSpec/IFS data from the BlackTHUNDER survey to study the H$α$ line in the LRD Abell2744-QSO1 at z=7.04, which is […]

Kavli Affiliate: Martin Haehnelt | Summary:We present measurements of the spatially averaged HeII photo-ionization rate ($langle Γ_rm HeII rangle$), mean free path of HeII ionizing photons ($λ_rm mfp, HeII$), and HeII fraction ($f_rm HeII$) across seven redshift bins within the redshift range $2<z<4$. The measurements are obtained by comparing the observed effective optical depth distribution […]

Kavli Affiliate: E. P. S. Shellard| First 5 Authors: The Simons Observatory Collaboration, The Simons Observatory Collaboration, , , | Summary:We describe updated scientific goals for the wide-field, millimeter-wave survey that will be produced by the Simons Observatory (SO). Significant upgrades to the 6-meter SO Large Aperture Telescope (LAT) are expected to be complete by […]