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L'observatoire astronomique de Strasbourg se fait une joie d'accueillir l'édition 2023 des journées annuelles de la Société Française d'Astronomie et d'Astrophysique (SF2A), du 20 au 23 juin sur le campus Esplanade. Plus de 500 personnes sont inscrites à ce temps fort de la recherche...
Internal shocks as a candidate for Prompt Gamma Ray Bursts (GRB)s Abstract Internal shocks are one of the prominent dissipation mechanisms for prompt gamma-ray emission. In internal shocks, each collision between two shells forms a pair of forward and reverse shocks, which dissipate part of...
Sun Unleashed: two approaches to predicting solar eruptions Abstract The spectacular phenomena known as solar eruptions can impact human infrastructure. As our society becomes more and more sensitive to solar activity due to the technological evolution, solar forecasting is a growing...
Extreme variability in active galactic nuclei: detection with eROSITA and results from multi-wavelength follow-up Abstract Active galactic nuclei (AGN) are known to be variable at all wavelengths and on many timescales. Large optical surveys have revealed a small number of AGN that show...
Quantum gravity and observations Abstract I will review in a pedagogical way the status of loop quantum gravity and its consequence for cosmology and black hoes. I will conclude by some interesting openings for testing string...
A catalogue of X-ray binaries to understand their evolution Abstract A majority of massive stars spend a least part of their lives along with a companion star. Depending on their evolutionary stage and their orbital parameters, this can produce phenomenons that are unique to binary systems....
Mapping the structure and kinematics of the Galactic disc with Gaia data Abstract Galactic studies are currently undergoing a renaissance, thanks to the wealth of data from the Gaia satellite and ground-based surveys. In the Galactic disc, where most of the stars in the Galaxy are contained,...
Galaxy Clusters in a New Relativistic Theory of Modified Newtonian Dynamics: Preliminary Results Abstract Galaxy clusters are generally accepted to be a problem for Modified Newtonian Dynamics (MOND), since a dark component is still needed to fit galaxy cluster observations. But MOND is a...
Molecular Cloud Evolution as the first step for Star Formation and Galaxy Evolution Abstract Molecular gas and clouds host virtually all star formation, and therefore, their formation and evolution are the first step leading to star formation and galaxy evolution. On the basis of broad...
Formation of black holes in the pair-instability mass gap Abstract In recent years, stellar models of the final phases of very massive stars have shown that pair-instability (PI) is expected to open a gap in the mass spectrum of black holes (BHs) between about 40 – 65 and 120 solar masses...