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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...
Une éclipse partielle de Soleil sera visible depuis la France le 25 octobre. A Strasbourg, le Soleil ne sera masqué qu'à moins de 20% au maximum de l'éclipse. Un événement (complet) sera organisé par le Jardin des Sciences dans les jardins de l'Observatoire astronomique. Grâce à...
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...
Reconstructing galaxy formation using observational tracers: from the Milky Way to the local Universe Abstract In this talk I will describe two complementary approaches to understanding the assembly of galaxies in a cosmological context. In the first method, we use star cluster properties to...
Understanding the nature of Partially Screened Gap in Pulsars from Subpulse Drifting Abstract The radio emission from pulsars is expected to arise as a result of instabilities developing in a non-stationary plasma moving along the open magnetic field lines. The out-flowing plasma is setup...
Pushing the frontiers of gravitational encounters and collisionless dynamics Abstract The long range nature of gravity complicates the dynamics of self-gravitating many-body systems such as galaxies and dark matter (DM) halos. Relaxation/equilibration of perturbed galaxies and cold dark...
Inferring dark matter halo properties for HI-selected galaxies Abstract An important test of LCDM is the degree of consistency between dark matter halo properties measured using galaxy kinematics and their cosmologically expected values. Due to the observational expense in obtaining resolved...
Some ideas on a fermionic origin of MOND and CDM Abstract Current observations point to a bifurcation of theories of structure formation; below cluster scale there’s no real evidence for CDM once allowing for uncertainty of gravity theory; and above cluster scale it is still easiest to...
Implications of gravitational wave detections for stellar astrophysics and feedback Abstract Stars with masses much higher than our Sun end their short lives in a gravitational collapse, leaving behind neutron stars and black holes. The detections of gravitational waves (GW) brought...