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2026.05.12
A model independent Alcock–Paczynski test using the profiles of voids and clusters
Robust inference with minimal dependence on uncertain models of physical processes is increasingly essential for precision cosmology. We present a geometrical test based on a null statistic constructed from the distribution of galaxies around cosmological voids and clusters of galaxies. The key idea is to form crossed density contrasts whose leading linear redshift-space distortion terms cancel...
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2026.05.12
SPT-selected protoclusters and the early emergence of the hot intracluster gas
The South Pole Telescope (SPT) has discovered a large sample of millimetre point sources in the 2500 deg^2 SPT-SZ survey. Follow-up observations with ALMA show that about 90% of these sources are strongly lensed dusty star-forming galaxies (DSFGs), while the remaining ~10% are compact groups of DSFGs at z~3-7, representing protocluster cores caught during their most intense phase of star format...
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2026.04.23
Could we detect the hot CGM in X-ray?
Extended, diffuse soft X-ray emission has been widely detected around individual galaxies and is commonly attributed to either galactic feedback processes or gravitational heating, with the latter expected to be efficient primarily in massive systems. However, in most galaxies the observed X-ray radiation efficiency—defined as the fraction of feedback energy emitted in X-rays—is far below uni...
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2026.04.24
A 3D view of the Milky Way spiral arms with Gaia DR3
Due to Gaia’s outstanding astrometric capabilities, the field of Galactic cartography is currently undergoing a revolution, reaching a level of detail and precision that has not been seen before. In this talk I will present some of the recent results in this field: imprints of major mergers in the Galaxy, chemical inhomogeneities in the Galactic disk, and disequilibrium features in stellar dis...
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2026.04.23
Chemical enrichment from individual stars in ultra-faint galaxies
Modern galaxy formation simulations routinely reach the scales necessary to self-consistently capture the internal structure of molecular clouds while simultaneously accounting for galactic-scale gas flows. Furthermore, individual stars can be treated as resolved objects, even in cosmological environments. I will present such a suite of simulated dwarf galaxies, in which I systematically explor...
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2026.04.22
Metallicity as an Astrophysical Diagnostic
Metallicity is one of the most powerful diagnostics of galaxy formation and evolution, encoding the cumulative history of gas accretion, star formation, feedback, and assembly. In this talk, I will begin with two basic mass-continuity equations governing gas and metal evolution in galaxies, showing how their analytic behaviour naturally explains a wide range of observed scaling relations. I wil...
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2026.03.31
Dark Energy and Neutrino Mass – the Latest Hints from DESI Using Baryon Acoustic Oscillations
The DESI collaboration (Dark Energy Spectroscopic Instrument) confirmed its groundbreaking results on dynamical dark energy through the largest 3-dimensional Universe map it observed. This talk highlights how DESI’s Baryon Acoustic Oscillation (BAO) measurements from Data Release 2 further challenge the ΛCDM paradigm, the standard cosmology for the past 30 years. The second part of this talk ...
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2026.03.25
4MOST-Cosmology Redshift Survey: Overview
In this talk, I will present the 4-metre Multi-Object Spectroscopic telescope as well as the recent news related to the on-going Science Phase Verification which aims to make different tests for all 4MOST science cases. I will in a second time present in more details the Cosmology Redshift Survey, especially the Bright Galaxies and Luminous Red Galaxies samples, as well as the quality checks an...
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2026.03.11
Simulating Accretion and Early Light Curve in Tidal Disruption Event (TDE)
The tidal disruption of a star by a supermassive black hole and consequent accretion can lead to a transient electromagnetic flare in multiple bands. However, the origin of the detected emission from such tidal disruption events (TDEs) remains an open question. In this talk, I will discuss the potential emission mechanisms in TDEs during accretion disk formation, implied by series of 3D radiati...
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2026.06.04
Galaxy-dark matter connection星系-暗物质关联
Galaxies form within the cosmic web dominated by dark matter. Investigating and establishing the connection between galaxies and dark matter is crucial for research in cosmology, large-scale structure, and galaxy formation. In this talk, I will present our recent studies in this area. On large scales, we have developed a set of methods that can reconstruct the initial conditions of the dark mat...
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