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2025.09.11
Strong lensing studies with Euclid
Strong gravitational lensing is a powerful tool for astrophysics and cosmology. I will present the Euclid Collaboration's current lens-finding efforts, including the "lens-finding engine" in Euclid's Quick Release 1, and the project I lead on double-source-plane lenses (DSPLs). DSPLs—systems with two Einstein rings at different source redshifts—are uniquely valuable for both cosmological dist...
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2025.09.10
The Population of LISA MBHBs: What we have learned from simulations
Massive black holes (MBHs) are found in the centres of most massive galaxies. When two galaxies merge, their respective MBHs are brought together, some of them will eventually coalesce and become powerful sources of gravitational waves (GWs). The detection of GWs from stellar-mass black hole binaries by the Laser Interferometer Gravitational-Wave Observatory (LIGO) marked the dawn of the ..
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2025.08.18
Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations using Lyman alpha forests from DESI and CSST
The Baryon Acoustic Oscillations (BAO) is a powerful large-scale structure probe that is used to constrain dark energy models, and is the main goal of the latest large cosmology survey, eBOSS and Dark Energy Spectroscopic Instrument (DESI). I will present DESI second Data Release (DR2) cosmological results with a particular focus on the measurement of BAO from Lyman-α forest. We measure the is...
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2025.08.15
DESI DR1 Full-Shape analysis: constraining cosmology and mitigating projection effects
Full-shape clustering measurements from DESI DR1 leverage information from the linear to quasi-nonlinear scales to deliver percent-level constraints on cosmological parameters. However, FS analyses relying on broad priors frequently suffer from projection effects, where marginalization over poorly constrained nuisance parameters can bias the inferred posteriors. To address this, we introduce ph...
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2025.08.20
NEXUS: A Spectroscopic Census of Broad-line AGNs and Little Red Dots at 3≲z≲6
In this talk, I will present analysis of a spectroscopic sample of 23 broad-line AGNs (BLAGNs) at 3≲z≲6 selected using F322W2+F444W NIRCam/WFSS grism spectroscopy of the central 100 arcmin2 area of the NEXUS survey. Among these BLAGNs, 15 are classified as Little Red Dots (LRDs) based on their rest-frame UV-optical spectral slopes and compact morphology. The number density of LRDs is ∼1e-5 c...
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2025.07.09
Galaxy growth from the early universe to cosmic noon
Over the past few years, JWST's exquisite sensitivity, wavelength coverage and resolution have dramatically advanced observational studies of distant galaxies. Ground-based facilities have added to this complementary views from wide-area imaging, integral-field spectroscopy and (sub)-mm probes. In this talk, I will share recent discoveries on rapidly maturing galaxies from the first billion yea...
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2025.07.09
The Population of LISA MBHBs: What we have learned from simulations
Massive black holes (MBHs) are found in the centres of most massive galaxies. When two galaxies merge, their respective MBHs are brought together, some of them will eventually coalesce and become powerful sources of gravitational waves (GWs). The detection of GWs from stellar-mass black hole binaries by the Laser Interferometer Gravitational-Wave Observatory (LIGO) marked the dawn of the GW ast...
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2025.06.10
Do's and don'ts of observing proposal writing
Advances in astrophysics are often data driven. Yet, large observing facilities capable of collecting the most sensitive data are expensive. Telescope time therefore constitutes a precious resource, part of which is allocated via an open and competitive process. In this session, I will share reflections on observing proposal writing, aimed primarily at junior scientists (PhDs, postdocs) who are...
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2025.06.10
New models to interpret near and far observations of the metal-poor Universe
The Universe started without the heavy elements that make the complexity of our surrounding world (e.g. carbon, oxygen). In this talk, I will showcase advances in the numerical modelling of how these chemical elements are produced in stars, how they are dispersed around young galaxies by energetic events, and how they get ionized to power the emission and absorption lines we observe in the spec...
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2025.06.16
Towards a new generation of reflection models for precision measurements of accreting black holes
Blurred reflection features are commonly observed in the X-ray spectra of accreting black holes. In the presence of high-quality data and with the correct astrophysical model, X-ray reflection spectroscopy is a powerful tool to probe the strong gravity region of black holes, study the morphology of the accreting matter, measure black hole spins, and test Einstein's theory of General Relativity ...
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