© 2025 Observatoire Astronomique de Strasbourg | Webdesign et développement Alchimy.
Prompt cusps of dark matter halos Abstract The onset of the formation of dark matter halos in the early universe was marked by the monolithic collapse of smooth peaks in the density field. This process creates prompt rho ~ r^-1.5 density cusps, which persist largely unaltered through the...
Dust and stars in galaxies: a complex interplay Abstract The complex interplay between dust and stellar emission is reflected by the diversity of situations: the contrast is stricking between organized grand design spirals with regular distributions of each component and...
Probing substructure with cold stellar streams: the diffusion regime Abstract Cold tidal streams from disrupting globular clusters offer a promising probe to constrain substructure (small-scale potential perturbations) in the Milky Way halo, purely gravitationally. While the bulk of the...
Linear stability and linear response of stellar clusters with the matrix method Abstract In the last few decades, observational evidence showed that spheroidal stellar systems of all scales – from the smallest star clusters to the largest galaxies – display significant kinematic...
Can we constrain planet formation from atmospheric abundances? Abstract Observations of exoplanets have mostly constrained theories via occurrence rates of planetary masses, radii and their orbital distributions. However, recent observations have also started to constrain the chemical...
Cold gas dynamics in high-z galaxies Abstract Gas dynamics play a key role in our understanding of the formation and evolution of galaxies. At z=0 gas dynamics has been extensively studied using a variety of tracers, such as the emission lines of atomic gas (HI), molecular gas (CO), and...
Constraining dark matter with strong lensing and hydro simulations Abstract It has been demonstrated that strong gravitational lensing is one of the most promising methods to distinguish between CDM and alternative dark matter models. Warm dark matter can be constrained through the...
Stellar Tidal Streams beyond the Local Group Abstract Within the hierarchical framework for galaxy formation, merging andtidal interactions are expected to shape large galaxies up to thepresent day. While major mergers are quite rare at present, minormergers and satellite disruptions - that...
The solar neighbourhood and ultracool dwarfs revealed by Gaia Abstract Gaia relies on the proven principles of ESA's Hipparcos mission to help solve one of the most difficult yet deeply fundamental challenges in modern astronomy: the creation of an extraordinarily precise three-dimensional...
Dust Depletion Near and Far Abstract Dust grains play an important role in galaxy ecosystems from the very smallest scales in the interstellar medium through photoelectric heating all the way to the global galactic scales through reprocessing of UV photons into infrared photons. These...