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A Self-Consistent Treatment of Dynamical Friction: New Insights into Core Stalling and Dynamical Buoyancy AbstractDynamical friction is typically regarded as a secular process, in which the subject (`perturber’) inspirals very slowly (secular approximation), and has been introduced to the...
Molecular component in ram pressure stripped tails of cluster galaxies AbstractIn recent years, numerous cluster galaxies with tails of ram pressurestripped (RPS) gas have been discovered, many containing young stars.These are dramatic examples of galaxy evolution driven by the...
Weighing the Galactic disk using phase-space spirals AbstractWe have developed a new method for inferring the gravitational potential of the Galactic disk, using the time-varying structure of a phase-space spiral in the plane of vertical position and vertical velocity. Our method of...
Non-Cold Dark Matter: Particle Physics versus Cosmology AbstractDark matter should represent 80% of the matter content of the Universe, yet its fundamental nature is still unknown. Even though the LambdaCDM model, with CDM for Cold dark matter, provides a very good fit to cosmological data,...
Fitting the Secular Evolution of the Milky Way Disk AbstractDisk galaxies present a great regularity in their stellar bodies butreveal complex structures in their young stars and gas. The Milky Way isan ideal model organism to study the connection between the highlystructured birth conditions...
XSL: a new generation empirical stellar library and stellar population models AbstractWith the next generation wide-field spectroscopic facilities, such asthe upcoming WEAVE for the William Herschel Telescope, and recentadvances in the infrared instruments on large telescopes, such asX-shooter...
From stars to large-scale structures: chemical enrichment in the intracluster medium AbstractDespite being the building blocks of rocky planets and even life, metals mostly reside outside galaxies - i.e. within a hot, ionized, X-ray emitting plasma pervading galaxy clusters and groups, and...
Probing dark energy with cosmic shear AbstractUnderstanding the accelerated expansion of the Universe is one of the most important challenges of modern cosmology. Thanks to the development of large dedicated surveys (Euclid, Rubin/LSST, Roman/WFIRST), weak-lensing cosmic shear offers the...
Protostellar disk formation in low- and high-mass star formation AbstractThe new generation of interferometers provide unprecedented constraints on the protostellar disk formation process. Observations indicate that most protostellar disks have a small extent at the Class 0 stage and that disks...
May 13 2020 The ObAS seminars have moved online, every Friday morning at 10:30 here The program of the coming weeks is: Friday May 15: Marie Korsaga (Cape Town) Friday May 29: Chervin Laporte (Tokyo) Friday June 12: Jean-Baptiste Fouvry (IAP) Friday June 19: Zhen Yuan (Shanghai) Friday...