Fakultät für Physik und Astronomie

Barred galaxies in LambdaCDM: Deciphering the formation history and dark matter content of Milky Way-type galaxies

Dr. Francesca Fragkoudi , European Southern Observatory

The advent of high resolution hydrodynamical cosmological simulations allows us to now study the dynamics of barred galaxies, such as our own Milky Way, within the full ?CDM cosmological context. I will present what we have learned about the formation history of our galaxy and its inner structures -- such as the bar and the boxy/peanut bulge -- by comparing the chemo-dynamical properties of its inner stellar populations to both isolated/tailored and cosmological simulations. In particular, I will present evidence of the Galaxy's unusually quiescent merger history, and of the almost entirely in-situ formation of its bulge. I will also show how studying the dynamics of barred galaxies in cosmological simulations -- in particular the interaction through dynamical friction of the bar and the dark matter halo -- can help us shed light on the amount of dark matter in massive spiral galaxies. I will discuss these results in light of recent claims in the literature of a 10sigma tension between fast bars and LCDM, and within the context of galaxy formation and evolution in general. The Zoom session for this colloquium will be open-ended to allow further informal discussions, moderated by Dr Fragkoudi's host, Dr Nadine Neumayer (neumayer@mpia.de). zoom access code 69120

Heidelberg Joint Astronomical Colloquium
8 Feb 2022, 16:00
Location not specified.

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