28-29 June 2021
The outer reaches of galaxies: structure, kinematics, and accretion history
The study of galaxy halos is reaching a golden age where it has become possible to compare observations of their physical properties with predictions from cosmological simulations of structure formation. Thanks to telescopes with large fields of view we can measure surface brightness features as faint as 30 mag arcsec-2, unveiling on-going accretion events. Fine-tuned spectroscopic techniques, using telescopes equipped with integral field, multi-object or custom-built slitless spectrographs, allow 2D kinematic mapping from the centres far into the outer regions of galaxies. Discrete tracers, resolved stars in nearby systems, planetary nebulae and globular clusters further afar, provide velocity fields and angular momentum profiles out to large distances. Modern cosmological simulations resolve the accretion of satellites with a large mass range, enabling detailed predictions of the three-dimensional shapes, kinematics and angular momentum distributions in galaxy halos, and linking these to the merger and accretion history of galaxies. Reaching out to the galaxy outskirts is key to mapping the transition from baryon to dark matter dominated regions, to assessing dark matter?s substructures and to linking galaxies to their cosmological environments.
During this EAS symposium, close interaction between observational astronomers, theorists and simulators will identify those topics that can be tacked jointly as new windows of investigation open up, and that help us learn more about the major physical processes which govern the formation of the outer halos.
Updated on Tue Feb 23 12:57:54 CET 2021
European Astronomical Society