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2026.11.03
Dark substructure and gravitational lensing
Galaxy-galaxy strong lensing is a powerful tool for studying galaxy structure and dark matter substructure. Detecting these subhaloes constrains the halo mass function and, through it, the nature of dark matter. Euclid, Roman and CSST will soon deliver tens of thousands of lenses, and JWST is already providing high-resolution imaging for hundreds of new lenses. Together these surveys will let u...
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2026.11.02
The Lumina Project: How Assembly History Shapes Galaxy Disk Sizes across Cosmic Time
Classic disk formation theory links galaxy disk sizes to the angular momentum of their host halos. Yet simulations find a weaker spin-size correlation than expected, raising the question of whether the connection is intrinsically weak or measured at the wrong time. I will address this using Lumina, a new large-volume radiation-hydrodynamic simulation based on IllustrisTNG, together with TNG100-...
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2026.10.28
Forecasting cosmology from the large-scale structure with the Zel’dovich-inspired transform
The Stage-IV galaxy surveys offer unprecedented opportunities to investigate fundamental cosmological and physical questions. However, extracting the maximum amount of cosmological information from the vast volumes of nonlinear and non-Gaussian data generated by these surveys remains a major challenge. To address this, it is essential to develop advanced statistical methods that go beyond the c...
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2026.11.27
Recent results from the LOFAR radio telescope and ESA’s Euclid mission
The Low-Frequency Array (LOFAR) is a pan-European radio telescope with immense data-collection and processing capabilities, making it an unprecedentedly powerful instrument for conducting the deepest and widest radio surveys at the lowest frequencies accessible from the ground. The Euclid space telescope is currently mapping a large fraction of the optical and near-IR sky at high angular resolu...
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2026.10.27
The Euclid mission: a space telescope to unravel the mystery of the Universe
Euclid is an ESA mission designed to probe the dark Universe by mapping about one third of the sky (~15,000 deg²) over six years, measuring the shapes, positions and redshifts of billions of galaxies out to z ≈ 2. Its 1.2 m telescope feeds a visible imager (VIS) and a near-infrared spectro-photometer (NISP, Y/J/H imaging and slitless spectroscopy at 1206–1892 nm). Launched on 1 July 2023 to t...
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2026.10.23
Spectroscopic extraction with deep learning
Euclid's NISP instrument performs slitless spectroscopy between 1206 and 1892 nm, dispersing the light of every source in the field with no entrance slit to isolate individual objects. This makes spectral extraction difficult. The spectra of neighbouring sources overlap, extended objects produce blended and spatially broadened spectra, and the dispersed light of nearby sources contaminates the ...
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2026.11.16
From dust grains to planetesimals, via streaming instability?
Dust grains shine brightly in proto-planetary disks. If these grains become large enough and dense enough, they can stir the gas via the so-called streaming instability. The turbulent gas may then cluster the grains into even denser clumps, possibly triggering the formation of planetesimals. I will first describe our not-entirely-successful efforts to quantify the few key steps in this picture....
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2026.10.20
Pulsars discovered by FAST and measurements of relativistic effects
Pulsars are end-products from the evolution of massive stars. Over the past 60 years, there have been many significant discoveries, such as the discoveries of the first pulsars, the first binaries, millisecond pulsars, magnetars, the only triple systems. However, many fundamental questions about pulsars remain unanswered, such as how many pulsars are there in the Milky Way, how they are distrib...
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2026.10.21
Revealing the in-situ molecular gas structure around giant molecular clouds and star clusters
Molecular gas structure encodes key information about the physical processes involved in giant molecular cloud (GMC) formation and collapse, as well as their response to stellar feedback. While a large number of studies have systematically characterized the physical properties of individual GMCs, their spatial distribution and surrounding gas structure have been less extensively studied. In thi...
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2026.10.16
The Angular Momentum Distribution of Baryons in Disc Galaxies: Observations and Physical Origins
The angular momentum distribution (AMD), defined as the mass per unit specific angular momentum, encapsulates the full internal distribution of angular momentum in galaxies and dark matter haloes, going beyond what the total specific angular momentum alone can capture. Although dark matter haloes exhibit characteristic AMD profiles, how baryons acquire and redistribute their angular momentum du...
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