Mini-Workshop on Star Clusters and Galaxy Formation with ORIGINS Guests Pavel Kroupa and Duncan Forbes

Tuesday Jul 5, 2022, 2:15 PM → 4:30 PM Europe/Berlin

MIAPbP Seminar Room (Hybrid)

Andreas Burkert (LMU), Rhea-Silvia Remus (LMU/USM)

All cluster scientists and their group members are invited to participate in this afternoon on galaxy science with two renowned ORIGINS guests.

Prof. Pavel Kroupa (Uni. Bonn) is a worldwide highly-respected expert on star formation and stellar cluster physics, black hole physics and galaxy evolution.

Prof. Duncan Forbes (Swinburne University) is a world-leading expert on using Globular Clusters (GCs) as tracers for galaxy properties, and for low-surface brightness galaxy science.

Venue: MiAPbP Seminar Room (Hybrid), Boltzmannstr. 2, Garching, Map attached

https://tum-conf.zoom.us/j/62091296955

Meeting ID: 620 9129 6955

Passcode: 762629

Gebäudeplan-IPP-400dpi-ORIGINS.pdf

1 The first star clusters and SMBH formation therein

The most massive galaxies started to form earliest and on the shortest time. At their centres the formation began with the first ultra-massive star clusters, weighing 10^7-10^10 Msun, depending on the mass of the post-Big-Bang gas cloud that later (on the downsizing time-scale) evolves to the early-type galaxy or bulge. I will discuss the physical and dynamical processes in these clusters, which, due to the low metallicity, form with top-heavy IMFs, and how the formation of the surrounding spheroidal galaxy dictates their evolution. For spheroid masses larger than a few 10^9 Msun, the central cluster implodes to a SMBH seed which can continue to grow as long as the spheroid keeps forming on the downsizing time-scale. The result of these events is the present-day observed strong correlation between the SMBH mass and its hosting spheroid. This theory also explains the existence of quasars at redshifts larger than 9.

Speaker: Prof. Pavel Kroupa (Uni. Bonn)

2:45 PM Discussion and Coffee Break

2 Ultra Diffuse Galaxies: Galaxies at the Extreme

Ultra Diffuse Galaxies (UDGs) were first identified using the Dragonfly Telescope Array in 2015. Their extreme properties (of low surface brightness, large size, and in some cases rich globular cluster systems) continue to present challenges for standard cosmological simulations. UDGs may represent galaxies with a range of properties: from puffed-up dwarfs to failed galaxies, from those with overly massive dark matter halos to some that are dark matter free. In my talk I will present new observations, and contrast these with the latest simulations, summarising our current understanding of this extreme class of galaxy.

Speaker: Prof. Duncan Forbes (Swinburne University)

3:45 PM Discussions and Refreshments