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Proposing Institution

Argelander-Institut fuer Astronomie, Bonn
Project Manager

Enrico Garaldi
Auf dem Hügel 71
53121 Bonn
The precursor of current galaxy clusters are thought to be formed shortly after the Big Bang. Observations presented in Marrone et al. (2017) claim the first detection of one of these progenitors. The inferred properties are uncertain but still rather extreme for current galaxy formation models, having very high star-formation rate, total mass and stellar mass. We plan to investigate the occurrence of similar objects in numerical simulations by looking for comparable galaxy cluster in a large simulation box and then performing a set of zoom-in simulations on the most-massive objects. They will enable us to study the role of merger in enhancing the star formation rate in the most-massive structures less than a billion years after the Big Bang. Beside testing the current cosmological and galaxy formation models in such extreme objects, these simulations will enable us to better understand observations through a rigorous analysis of projection effects and blending that can artificially alter and enhance the inferred properties of the observed galaxy cluster progenitor. Finally, this project will be able to connect the observed gas and stellar mass to the underlying matter distribution more accurately than with the usage of scaling relations, as done now. The simulations will be run with a custom version of the popular smoothed-particle hydrodynamics code GADGET3.

Impressum, Conny Wendler