Seminar

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Du 20 May 2022 au 20 May 2022

Séminaire – Paolo Bianchini (ObAS)

The renaissance of globular clusters: old stellar systems for new dynamical questions Abstract The traditional picture of globular clusters (GCs) as old simple stellar systems is being radically revolutionized by groundbreaking observational programs such as Gaia and by extensive...

Du 6 May 2022 au 6 May 2022

Séminaire – Chengdong Li (Oxford University)

Characterizing the stellar halo with distribution function based models Abstract A new class of models is used to build a self-consistent model of our Galaxy. The model is defined by the parameters that specify the distribution functions (DFs) f(J) of four stellar discs (three thin-disc age...

Du 29 April 2022 au 29 April 2022

Séminaire – Friedrich Anders (University of Barcelona)

Exploiting the full Gaia data: From Bayesian isochrone fitting to transferring spectroscopic stellar parameters to 1 billion Gaia DR3 stars Abstract I will present a new stellar-parameter catalogue obtained from Bayesian isochrone fitting for 400 million Gaia EDR3 stars (cross-matched with...

Du 25 March 2022 au 25 March 2022

Séminaire – Mike Petersen (IAP)

A new picture for the Large Magellanic Cloud-Milky Way interaction Abstract Over the past decade, our understanding of the Large Magellanic Cloud (LMC) and its relationship to the Milky Way (MW) has undergone a paradigm shift. The LMC now appears to be on the order of 20% of the MW mass. At...

Du 18 March 2022 au 18 March 2022

Séminaire – Chérifa Boukacem (ELICO)

Early Career Researchers the Harbingers of Change: attitudes, behaviours and strategies regarding the changing world of scholarly communication  Abstract This presentation is related to an international study informed by a 5-year-long qualitative longitudinal project, which sought to...

Du 11 March 2022 au 11 March 2022

Séminaire – Anke Arentsen (ObAS)

Galactic Archaeology with the oldest stars in the Milky Way Abstract The oldest, most metal-poor stars we find in the Milky Way today were born in pristine environments in the early Universe. They contain unique clues about the First Stars and the early formation and evolution of our Galaxy....

Du 4 March 2022 au 4 March 2022

Séminaire – Hakim Atek (IAP)

Probing the first galaxies and cosmic reionization with the James Webb Space Telescope Abstract The role of dwarf galaxies in the star formation history of the universe has long been overlooked, primarily because of observational challenges and the predominance of bright,...

Du 18 February 2022 au 18 February 2022

Séminaire – Corentin Cadiou (UCL)

On the causal origin of properties of dark matter halos and galaxies Abstract Large-cosmological simulations, such as Illustris-TNG or Horizon-AGN, allows to draw relations between the formation history of galaxies and their host haloes (number of mergers, formation time) and their...

Du 4 February 2022 au 4 February 2022

Séminaire – Guillaume Mahler (Durham)

Strong lensing: Illuminating galaxies clusters and the structures behind them Abstract The strong gravitational lensing effect is a powerful technic to study both the deflector of light and the magnified sources behind it. In this talk, I will first review mass modelling approaches of galaxy...

Du 28 January 2022 au 28 January 2022

Séminaire – Tiago Costa (MPA Garching)

Quasar feedback and the origin of extended Lyα glow in z > 6 quasars AbstractThe detection of quasars out to z ≈ 7.5 shows that supermassive black holes with masses of ≈109M☉ have already assembled by the time the Universe was only ≈ 680 Myr old. These observationsstrenuously...