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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...
Accretion of Self-interacting Scalar Field Dark Matter Onto Reissner Nordström Black Holes Abstract Self-interacting scalar field dark matter is a suitable extension of the free case known as Fuzzy dark matter. The interactive case can reproduce the goodness of the free case at both...
Chemical Characterization of the building blocks of the Milky Way Abstract Since galaxy merger and accretion are fundamental processesin galaxy evolution, reconstructing the accretion history is key tounderstanding the evolution of a galaxy. In the Milky Way, we canstudy ancient accretion...
What is the origin of the different kinematic morphologies of early-type galaxies? Abstract Early-type galaxies (i.e. elliptical and lenticular) are divided into slowand fast rotators according to the appearance of their maps ofline-of-sight velocity. Fast rotators show clear ordered...