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 […]

Kavli Affiliate: Debora Sijacki | Summary:Protoclusters represent the most extreme environments in the very early Universe. They form from large-scale dark matter overdensities, harbouring an overabundance of galaxies fed by large gas reservoirs. Their early and accelerated evolution results in a distinct difference in the properties of galaxies resident in protoclusters versus the field, which […]

Kavli Affiliate: R. G. McMahon| First 5 Authors: TRI LBM Team, TRI LBM Team, , , | Summary:Robot manipulation has seen tremendous progress in recent years, with imitation learning policies enabling successful performance of dexterous and hard-to-model tasks. Concurrently, scaling data and model size has led to the development of capable language and vision foundation […]