Kavli Affiliate: Roberto Maiolino| First 5 Authors: Yongda Zhu, Yongda Zhu, , , | Summary:We present observational evidence that intense ionizing radiation from a luminous quasar suppresses nebular emission in nearby galaxies on intergalactic scales at $z=6.3$. Using JWST/NIRCam grism spectroscopy from the SAPPHIRES and EIGER programs, we identify a moderate but statistically significant decline […]

Kavli Affiliate: George Efstathiou | Summary:The cosmic 21-cm signal is a promising probe of the early Universe, owing to its sensitivity to the thermal state of the neutral intergalactic medium (IGM) and properties of the first luminous sources. Here, we constrain the 21-cm signal and infer IGM properties using the Population II galaxy parameters derived […]

Kavli Affiliate: Kaisey Mandel | Summary:We present a method for accurately and precisely inferring photometric dust extinction towards stars at mid-to-high Galactic latitudes using probabilistic machine learning to model the colour-magnitude distribution of zero-extinction stars in these regions. Photometric dust maps rely on a robust method for inferring stellar reddening. At high Galactic latitudes, where […]

Kavli Affiliate: Roberto Maiolino| First 5 Authors: Joris Witstok, Joris Witstok, , , | Summary:The unexpectedly high abundance of galaxies at $z > 11$ revealed by JWST has sparked a debate on the nature of early galaxies and the physical mechanisms regulating their formation. The Atacama Large Millimeter/submillimeter Array (ALMA) has begun to provide vital […]

Kavli Affiliate: George Efstathiou | Summary:The first stars, the chemically pristine Population III, likely played an important role in heating the intergalactic medium during the epoch of cosmic dawn. The very high effective temperatures ($sim 10^5$ K) predicted for the most massive Population III stars could also give rise to tell-tale signatures in the emission-line […]

Kavli Affiliate: George Efstathiou | Summary:The first stars, the chemically pristine Population III, likely played an important role in heating the intergalactic medium during the epoch of cosmic dawn. The very high effective temperatures ($sim 10^5$ K) predicted for the most massive Population III stars could also give rise to tell-tale signatures in the emission-line […]

Kavli Affiliate: Roberto Maiolino | Summary:Little Red Dots (LRDs) are compact, red sources discovered by JWST at high redshift ($z gtrsim 4$), marked by distinctive ‘V-shaped’ spectral energy distributions (SEDs) and often interpreted as rapidly accreting Active Galactic Nuclei (AGNs). Their true nature remains unclear, however, and their evolutionary connection to their lower-redshift counterparts is […]

Kavli Affiliate: Anthony Challinor | Summary:We measure the amplitude of matter fluctuations over a wide range of redshifts by combining CMB lensing observations from ACT DR6 and $textitPlanck$ PR4 with the overdensity of quasars from Quaia, a $textitGaia$ and $textitunWISE$ quasar catalog. Our analysis includes the CMB lensing power spectrum from ACT DR6, the auto-correlation […]

Kavli Affiliate: Roberto Maiolino | Summary:We present an analysis of metallicities and chemical abundances at $3<z<12$ in the THESAN-ZOOM simulations. We find that smoothly curved gas-phase and stellar mass-metallicity relations (MZR) are already in place at $zapprox12$ and evolve slowly ($sim$0.2 dex increase for gas, $sim$0.4 dex increase for stars at a fixed stellar mass) […]

Kavli Affiliate: Blake Sherwin | Summary:These notes are very much work-in-progress and simply intended to showcase, in various degrees of details (and rigour), some of the cosmology calculations that class_sz can do. We describe the class_sz code in C, Python and Jax. Based on the Boltzmann code class, it can compute a wide range of […]