Séminaire – Geraint Lewis (Sydney University)
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6 juin 2025
Séminaire – Pierre-Alain Duc (ObAS)
"From UDGs to UCDs via dE,Ns; evidence of star cluster migration and merger in dwarf galaxies" As the most numerous galaxies in the Universe, with an expected number depending on the cosmology, dwarf galaxies attract a lot of attention. However, outside the local group and galaxy clusters,...
26 mai 2025
Séminaire – Pascal Tremblin (CEA Saclay)
"Reevaluating the cosmological redshift: insights into inhomogeneities and irreversible processes" Understanding the expansion of the Universe remains a profound challenge in fundamental physics. The complexity of solving General Relativity equations in the presence of intricate, inhomogeneous...
23 mai 2025
Séminaire – Mark Sargent (ISSI Bern)
"The many facets of interaction-induced star-formation in galaxies" What is the spectrum of possible outcomes when galaxies merge? How often, and on which time scales, can this lead to accelerated vs. slowing growth?A key step towards understanding different evolutionary pathways is to quantify...
16 mai 2025
Séminaire – Pedro Palicio (Lagrange)
"Dynamics of the Spiral Arms as Seen by Gaia DR3 and Simulations" Although it is widely accepted that we live in a spiral galaxy, the location, population, and even the number of spiral arms remain controversial. These uncertainties arise from our position within the Milky Way disc, which...
9 mai 2025
Séminaire – Sukyoung Yi (Younsei University)
"NewCluster: a new high-resolution simulation for galaxy cluster in the era of JWST" The issue of massive galaxies found at high redshifts by JWST is challenging. I will discuss a few possible approaches to explain it: e.g., the environmental effects, black hole accretion history, and...
25 avril 2025
Séminaire – Judy Chebly (AIP)
"An inside out view of the coronae and winds of cool stars" Cool stars, like our Sun, produce powerful stellar winds that shape their evolution and influence the atmospheres of orbiting planets. While the solar wind is well studied, our understanding of winds from other cool stars remains...
11 avril 2025
Séminaire – Miroslava Dessauges-Zavadski (Université de Genève)
"Star clusters shaping the morphology and tracing the ISM of galaxies out to the reionisation epoch" The HST observations have revealed that more than 60% of star-forming galaxies at cosmic noon have peculiar morphologies characterised by UV-bright clumps. Such morphologies have now been found...
4 avril 2025
Séminaire – Divya Rawat (ObAS)
"Evolution of the Comptonizing medium of the black-hole candidate Swift J1727.8–1613 along the accretion state transition using NICER" Evidence for a strong connection between the X-ray corona and the radio jet in black hole X-ray binaries has grown significantly. During state transitions,...
28 mars 2025
Séminaire – Nicolas Deangelis (INAF Rome)
"Compton Polarimetry of Gamma-Ray Transients: Insights from Gamma-Ray Bursts to Solar Flares" Compton polarimetry offers a unique window into the physics of high-energy astrophysical transientsby directly probing the geometry, magnetic field structure, and radiation mechanisms in...